C
cfo
Sun, Mar 25, 2012 4:26 PM
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen & maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen & maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
CA
Chris Albertson
Sun, Mar 25, 2012 6:01 PM
I think people have used video amps. I got one recently for nearly
zero cost and it works as spec'd but video signals are typically 1
volt peak to peak and the amp is spec'd for "10MHz, 1dB" which means
I'm right at the limit and I'm a 1 dB down, just as the spec says.
Is 1V P-P enough for your equipment? This amp is easy to modify
and I can greatly improve the specs by running it at +/- 15V rather
then the +/-5V it now uses.
So, my opinion: Video distribution amps can work but you'll be right
on the edge of the spec'd limits all around.
On Sun, Mar 25, 2012 at 9:26 AM, cfo xnews3@luna.kyed.com wrote:
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen & maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
Chris Albertson
Redondo Beach, California
I think people have used video amps. I got one recently for nearly
zero cost and it works as spec'd but video signals are typically 1
volt peak to peak and the amp is spec'd for "10MHz, 1dB" which means
I'm right at the limit and I'm a 1 dB down, just as the spec says.
Is 1V P-P enough for your equipment? This amp is easy to modify
and I can greatly improve the specs by running it at +/- 15V rather
then the +/-5V it now uses.
So, my opinion: Video distribution amps can work but you'll be right
on the edge of the spec'd limits all around.
On Sun, Mar 25, 2012 at 9:26 AM, cfo <xnews3@luna.kyed.com> wrote:
> I need a distribution amp for my Tbolt , with 6..8+ outputs
>
> The TAPR-1 is NA , and the successor status is ???.
>
> I need it for distributing 10Mhz ref-clock to Counters
> (HP,Racal,Phillips), a Rigol Sig-gen & maybe Oscilloscopes etc.
>
> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>
> I have seen suggestions for using a video distributiution unit.
> But in my part of the world (EU) , there isn't a lot on "eby".
> I have seen some RGB amps , and was wondering if i could use those ?
>
> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
> B ?
>
> I'm not experienced (yet) in the analog domain.
>
> If i go (simple diy) Would this one work (also wo. the trafo's) ?
> http://www.oz9fw.dk/PDF%20files/rubidium.pdf
>
> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
> to salvage if needed.
>
> Thanx for any input/hints
>
> CFo - T-Nut beginner Denmark.
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
--
Chris Albertson
Redondo Beach, California
LM
Larry McDavid
Sun, Mar 25, 2012 6:12 PM
Chris, that's got to be a really old video distribution amplifier. I was
just given a thin rack-mount video distribution amplifier with ten
outputs and the specification says 300 MHz bandwidth at 3 dB. I have not
measured its output level. It is made by Kramer and has BNC and S-video
in/out but no RCA composite video connectors. Well, that's the published
spec; I have not tested it on my Tek 2712.
We are not talking about critical phase relationships, just distributing
10 MHz for sig generators and counters.
Larry
On 3/25/2012 11:01 AM, Chris Albertson wrote:
I think people have used video amps. I got one recently for nearly
zero cost and it works as spec'd but video signals are typically 1
volt peak to peak and the amp is spec'd for "10MHz, 1dB" which means
I'm right at the limit and I'm a 1 dB down, just as the spec says.
Is 1V P-P enough for your equipment? This amp is easy to modify
and I can greatly improve the specs by running it at +/- 15V rather
then the +/-5V it now uses.
So, my opinion: Video distribution amps can work but you'll be right
on the edge of the spec'd limits all around.
...
Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
Chris, that's got to be a really old video distribution amplifier. I was
just given a thin rack-mount video distribution amplifier with ten
outputs and the specification says 300 MHz bandwidth at 3 dB. I have not
measured its output level. It is made by Kramer and has BNC and S-video
in/out but no RCA composite video connectors. Well, that's the published
spec; I have not tested it on my Tek 2712.
We are not talking about critical phase relationships, just distributing
10 MHz for sig generators and counters.
Larry
On 3/25/2012 11:01 AM, Chris Albertson wrote:
> I think people have used video amps. I got one recently for nearly
> zero cost and it works as spec'd but video signals are typically 1
> volt peak to peak and the amp is spec'd for "10MHz, 1dB" which means
> I'm right at the limit and I'm a 1 dB down, just as the spec says.
> Is 1V P-P enough for your equipment? This amp is easy to modify
> and I can greatly improve the specs by running it at +/- 15V rather
> then the +/-5V it now uses.
>
> So, my opinion: Video distribution amps can work but you'll be right
> on the edge of the spec'd limits all around.
...
--
Best wishes,
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
BG
Bruce Griffiths
Sun, Mar 25, 2012 6:14 PM
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower
distortion is possible if a class A output stage is used (requires an
extra resistor between the output stage emitters and an additional diode
in series with the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a
a pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output
to the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively
high phase noise floor) is the limited output drive available. For some
purposes 16-20dBm outputs are desirable.
Bruce
cfo wrote:
> I need a distribution amp for my Tbolt , with 6..8+ outputs
>
> The TAPR-1 is NA , and the successor status is ???.
>
> I need it for distributing 10Mhz ref-clock to Counters
> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
>
> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>
> I have seen suggestions for using a video distributiution unit.
> But in my part of the world (EU) , there isn't a lot on "eby".
> I have seen some RGB amps , and was wondering if i could use those ?
>
> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
> B ?
>
> I'm not experienced (yet) in the analog domain.
>
> If i go (simple diy) Would this one work (also wo. the trafo's) ?
> http://www.oz9fw.dk/PDF%20files/rubidium.pdf
>
> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
> to salvage if needed.
>
> Thanx for any input/hints
>
> CFo - T-Nut beginner Denmark.
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower
distortion is possible if a class A output stage is used (requires an
extra resistor between the output stage emitters and an additional diode
in series with the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a
a pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output
to the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively
high phase noise floor) is the limited output drive available. For some
purposes 16-20dBm outputs are desirable.
Bruce
PS
paul swed
Sun, Mar 25, 2012 6:39 PM
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the whole tray for some silly amount of $ 20 I think.
I prefer the simple 8601 DAs but have 8604 delay days and they can all be
made into simple DAs with a few jumpers that are on the boards.
I have also used a rgb da 6 output for each channel. No issue at all.
One comment you would want to insure the amps are ac coupled and clamping
turned off since there is no sync signal to establish the clamp level.
Regards
Paul
WB8TSL
On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%**20files/rubidium.pdfhttp://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower distortion
is possible if a class A output stage is used (requires an extra resistor
between the output stage emitters and an additional diode in series with
the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a a
pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output to
the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively high
phase noise floor) is the limited output drive available. For some purposes
16-20dBm outputs are desirable.
Bruce
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the whole tray for some silly amount of $ 20 I think.
I prefer the simple 8601 DAs but have 8604 delay days and they can all be
made into simple DAs with a few jumpers that are on the boards.
I have also used a rgb da 6 output for each channel. No issue at all.
One comment you would want to insure the amps are ac coupled and clamping
turned off since there is no sync signal to establish the clamp level.
Regards
Paul
WB8TSL
On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
> wrote:
> cfo wrote:
>
>> I need a distribution amp for my Tbolt , with 6..8+ outputs
>>
>> The TAPR-1 is NA , and the successor status is ???.
>>
>> I need it for distributing 10Mhz ref-clock to Counters
>> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
>>
>>
>> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>>
>> I have seen suggestions for using a video distributiution unit.
>> But in my part of the world (EU) , there isn't a lot on "eby".
>> I have seen some RGB amps , and was wondering if i could use those ?
>>
>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
>> B ?
>>
>> I'm not experienced (yet) in the analog domain.
>>
>> If i go (simple diy) Would this one work (also wo. the trafo's) ?
>> http://www.oz9fw.dk/PDF%**20files/rubidium.pdf<http://www.oz9fw.dk/PDF%20files/rubidium.pdf>
>>
>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
>> to salvage if needed.
>>
>> Thanx for any input/hints
>>
>> CFo - T-Nut beginner Denmark.
>>
>>
>>
>> ______________________________**_________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>> and follow the instructions there.
>>
>>
>>
> Winding your own transformers isnt particularly difficult if you have
> suitable (binocular) cores.
> The discrete amplifier shown has a class AB output stage, lower distortion
> is possible if a class A output stage is used (requires an extra resistor
> between the output stage emitters and an additional diode in series with
> the LED).
> With a Class A output stage the 39 ohm resistors should be replaced by a a
> pair of 100 ohm resistors to match the load.
> Significantly lower distortion is possible if feedback from the output to
> the input stage is used.
> If the feedback gain is unity (or less) at dc higher AC gains won't
> significantly degrade the close in phase noise.
> A different amplifier topology using the same number of transistors will
> allow a higher reverse isolation to be achieved.
>
> One problem with video distribution units (aside from the relatively high
> phase noise floor) is the limited output drive available. For some purposes
> 16-20dBm outputs are desirable.
>
> Bruce
>
>
> ______________________________**_________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> and follow the instructions there.
>
BG
Bruce Griffiths
Sun, Mar 25, 2012 7:11 PM
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and
?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower
distortion is possible if a class A output stage is used (requires an
extra resistor between the output stage emitters and an additional
diode in series with the LED).
With a Class A output stage the 39 ohm resistors should be replaced by
a a pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output
to the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors
will allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively
high phase noise floor) is the limited output drive available. For
some purposes 16-20dBm outputs are desirable.
Bruce
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
Bruce Griffiths wrote:
> cfo wrote:
>> I need a distribution amp for my Tbolt , with 6..8+ outputs
>>
>> The TAPR-1 is NA , and the successor status is ???.
>>
>> I need it for distributing 10Mhz ref-clock to Counters
>> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
>>
>> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>>
>> I have seen suggestions for using a video distributiution unit.
>> But in my part of the world (EU) , there isn't a lot on "eby".
>> I have seen some RGB amps , and was wondering if i could use those ?
>>
>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and
>> ?? on
>> B ?
>>
>> I'm not experienced (yet) in the analog domain.
>>
>> If i go (simple diy) Would this one work (also wo. the trafo's) ?
>> http://www.oz9fw.dk/PDF%20files/rubidium.pdf
>>
>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
>> to salvage if needed.
>>
>> Thanx for any input/hints
>>
>> CFo - T-Nut beginner Denmark.
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
> Winding your own transformers isnt particularly difficult if you have
> suitable (binocular) cores.
> The discrete amplifier shown has a class AB output stage, lower
> distortion is possible if a class A output stage is used (requires an
> extra resistor between the output stage emitters and an additional
> diode in series with the LED).
> With a Class A output stage the 39 ohm resistors should be replaced by
> a a pair of 100 ohm resistors to match the load.
> Significantly lower distortion is possible if feedback from the output
> to the input stage is used.
> If the feedback gain is unity (or less) at dc higher AC gains won't
> significantly degrade the close in phase noise.
> A different amplifier topology using the same number of transistors
> will allow a higher reverse isolation to be achieved.
>
> One problem with video distribution units (aside from the relatively
> high phase noise floor) is the limited output drive available. For
> some purposes 16-20dBm outputs are desirable.
>
> Bruce
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
PL
Pete Lancashire
Sun, Mar 25, 2012 7:28 PM
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
One thing to watch out for is what cards they have in them.
-pete
On Sun, Mar 25, 2012 at 11:39 AM, paul swed paulswedb@gmail.com wrote:
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the whole tray for some silly amount of $ 20 I think.
I prefer the simple 8601 DAs but have 8604 delay days and they can all be
made into simple DAs with a few jumpers that are on the boards.
I have also used a rgb da 6 output for each channel. No issue at all.
One comment you would want to insure the amps are ac coupled and clamping
turned off since there is no sync signal to establish the clamp level.
Regards
Paul
WB8TSL
On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%**20files/rubidium.pdfhttp://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower distortion
is possible if a class A output stage is used (requires an extra resistor
between the output stage emitters and an additional diode in series with
the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a a
pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output to
the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively high
phase noise floor) is the limited output drive available. For some purposes
16-20dBm outputs are desirable.
Bruce
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
One thing to watch out for is what cards they have in them.
-pete
On Sun, Mar 25, 2012 at 11:39 AM, paul swed <paulswedb@gmail.com> wrote:
> Well the easy answer.
> The older 1984 video amps would roll off above 6 MC or so.
> However as the IC technology took over they easily could do 30 Mhz.
> I have used Grass valley 8500 series for at least 10-15 years and the work
> very well.
> I also have sets of Leitch DAs that are fine.
> Picked up the whole tray for some silly amount of $ 20 I think.
> I prefer the simple 8601 DAs but have 8604 delay days and they can all be
> made into simple DAs with a few jumpers that are on the boards.
> I have also used a rgb da 6 output for each channel. No issue at all.
> One comment you would want to insure the amps are ac coupled and clamping
> turned off since there is no sync signal to establish the clamp level.
> Regards
> Paul
> WB8TSL
>
> On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
>> wrote:
>
>> cfo wrote:
>>
>>> I need a distribution amp for my Tbolt , with 6..8+ outputs
>>>
>>> The TAPR-1 is NA , and the successor status is ???.
>>>
>>> I need it for distributing 10Mhz ref-clock to Counters
>>> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
>>>
>>>
>>> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>>>
>>> I have seen suggestions for using a video distributiution unit.
>>> But in my part of the world (EU) , there isn't a lot on "eby".
>>> I have seen some RGB amps , and was wondering if i could use those ?
>>>
>>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
>>> B ?
>>>
>>> I'm not experienced (yet) in the analog domain.
>>>
>>> If i go (simple diy) Would this one work (also wo. the trafo's) ?
>>> http://www.oz9fw.dk/PDF%**20files/rubidium.pdf<http://www.oz9fw.dk/PDF%20files/rubidium.pdf>
>>>
>>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
>>> to salvage if needed.
>>>
>>> Thanx for any input/hints
>>>
>>> CFo - T-Nut beginner Denmark.
>>>
>>>
>>>
>>> ______________________________**_________________
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>> and follow the instructions there.
>>>
>>>
>>>
>> Winding your own transformers isnt particularly difficult if you have
>> suitable (binocular) cores.
>> The discrete amplifier shown has a class AB output stage, lower distortion
>> is possible if a class A output stage is used (requires an extra resistor
>> between the output stage emitters and an additional diode in series with
>> the LED).
>> With a Class A output stage the 39 ohm resistors should be replaced by a a
>> pair of 100 ohm resistors to match the load.
>> Significantly lower distortion is possible if feedback from the output to
>> the input stage is used.
>> If the feedback gain is unity (or less) at dc higher AC gains won't
>> significantly degrade the close in phase noise.
>> A different amplifier topology using the same number of transistors will
>> allow a higher reverse isolation to be achieved.
>>
>> One problem with video distribution units (aside from the relatively high
>> phase noise floor) is the limited output drive available. For some purposes
>> 16-20dBm outputs are desirable.
>>
>> Bruce
>>
>>
>> ______________________________**_________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
CP
Charles P. Steinmetz
Sun, Mar 25, 2012 7:33 PM
A circuit schematic for a current feedback triple with reasonably
low noise and distortion is attached.
One caution regarding the 100 uH inductor (L3) -- many inductors of
this value exhibit self-resonance below 10 MHz, so some care may be
necessary in selection.
Best regards,
Charles
Bruce wrote:
>A circuit schematic for a current feedback triple with reasonably
>low noise and distortion is attached.
One caution regarding the 100 uH inductor (L3) -- many inductors of
this value exhibit self-resonance below 10 MHz, so some care may be
necessary in selection.
Best regards,
Charles
TK
Tom Knox
Sun, Mar 25, 2012 7:48 PM
Has anyone measured Phase Noise on any of these distribution amps? By looking at how widely the PN specs vary on the application specific Symmetricom and HP DA's it would be interesting to see how well these video da's perform in comparison.
Thomas Knox
Date: Sun, 25 Mar 2012 12:28:56 -0700
From: pete@petelancashire.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
One thing to watch out for is what cards they have in them.
-pete
On Sun, Mar 25, 2012 at 11:39 AM, paul swed paulswedb@gmail.com wrote:
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the whole tray for some silly amount of $ 20 I think.
I prefer the simple 8601 DAs but have 8604 delay days and they can all be
made into simple DAs with a few jumpers that are on the boards.
I have also used a rgb da 6 output for each channel. No issue at all.
One comment you would want to insure the amps are ac coupled and clamping
turned off since there is no sync signal to establish the clamp level.
Regards
Paul
WB8TSL
On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%**20files/rubidium.pdfhttp://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower distortion
is possible if a class A output stage is used (requires an extra resistor
between the output stage emitters and an additional diode in series with
the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a a
pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output to
the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively high
phase noise floor) is the limited output drive available. For some purposes
16-20dBm outputs are desirable.
Bruce
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Has anyone measured Phase Noise on any of these distribution amps? By looking at how widely the PN specs vary on the application specific Symmetricom and HP DA's it would be interesting to see how well these video da's perform in comparison.
Thomas Knox
> Date: Sun, 25 Mar 2012 12:28:56 -0700
> From: pete@petelancashire.com
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
>
> Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
> front porch next week. Its bandwidth is spec'd at 30 MHz.
>
> The only question I have on using DA's is the effect of them being designed to
> work in a 75 ohm environment.
>
> One thing to watch out for is what cards they have in them.
>
> -pete
>
>
>
> On Sun, Mar 25, 2012 at 11:39 AM, paul swed <paulswedb@gmail.com> wrote:
> > Well the easy answer.
> > The older 1984 video amps would roll off above 6 MC or so.
> > However as the IC technology took over they easily could do 30 Mhz.
> > I have used Grass valley 8500 series for at least 10-15 years and the work
> > very well.
> > I also have sets of Leitch DAs that are fine.
> > Picked up the whole tray for some silly amount of $ 20 I think.
> > I prefer the simple 8601 DAs but have 8604 delay days and they can all be
> > made into simple DAs with a few jumpers that are on the boards.
> > I have also used a rgb da 6 output for each channel. No issue at all.
> > One comment you would want to insure the amps are ac coupled and clamping
> > turned off since there is no sync signal to establish the clamp level.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffiths@xtra.co.nz
> >> wrote:
> >
> >> cfo wrote:
> >>
> >>> I need a distribution amp for my Tbolt , with 6..8+ outputs
> >>>
> >>> The TAPR-1 is NA , and the successor status is ???.
> >>>
> >>> I need it for distributing 10Mhz ref-clock to Counters
> >>> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
> >>>
> >>>
> >>> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
> >>>
> >>> I have seen suggestions for using a video distributiution unit.
> >>> But in my part of the world (EU) , there isn't a lot on "eby".
> >>> I have seen some RGB amps , and was wondering if i could use those ?
> >>>
> >>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
> >>> B ?
> >>>
> >>> I'm not experienced (yet) in the analog domain.
> >>>
> >>> If i go (simple diy) Would this one work (also wo. the trafo's) ?
> >>> http://www.oz9fw.dk/PDF%**20files/rubidium.pdf<http://www.oz9fw.dk/PDF%20files/rubidium.pdf>
> >>>
> >>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
> >>> to salvage if needed.
> >>>
> >>> Thanx for any input/hints
> >>>
> >>> CFo - T-Nut beginner Denmark.
> >>>
> >>>
> >>>
> >>> ______________________________**_________________
> >>> time-nuts mailing list -- time-nuts@febo.com
> >>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> >>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> >>> and follow the instructions there.
> >>>
> >>>
> >>>
> >> Winding your own transformers isnt particularly difficult if you have
> >> suitable (binocular) cores.
> >> The discrete amplifier shown has a class AB output stage, lower distortion
> >> is possible if a class A output stage is used (requires an extra resistor
> >> between the output stage emitters and an additional diode in series with
> >> the LED).
> >> With a Class A output stage the 39 ohm resistors should be replaced by a a
> >> pair of 100 ohm resistors to match the load.
> >> Significantly lower distortion is possible if feedback from the output to
> >> the input stage is used.
> >> If the feedback gain is unity (or less) at dc higher AC gains won't
> >> significantly degrade the close in phase noise.
> >> A different amplifier topology using the same number of transistors will
> >> allow a higher reverse isolation to be achieved.
> >>
> >> One problem with video distribution units (aside from the relatively high
> >> phase noise floor) is the limited output drive available. For some purposes
> >> 16-20dBm outputs are desirable.
> >>
> >> Bruce
> >>
> >>
> >> ______________________________**_________________
> >> time-nuts mailing list -- time-nuts@febo.com
> >> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> >> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> >> and follow the instructions there.
> >>
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
CA
Chris Albertson
Sun, Mar 25, 2012 7:51 PM
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
Swap out a few resistors and you can fix the above problem. unless
they used those 75 ohm BNCs but those are rare and if you are a true
"nut" you can replace them. In my amp the resistors are all very easy
to swap through hole 1/4W types
Chris Albertson
Redondo Beach, California
On Sun, Mar 25, 2012 at 12:28 PM, Pete Lancashire
<pete@petelancashire.com> wrote:
>
> The only question I have on using DA's is the effect of them being designed to
> work in a 75 ohm environment.
Swap out a few resistors and you can fix the above problem. unless
they used those 75 ohm BNCs but those are rare and if you are a true
"nut" you can replace them. In my amp the resistors are all very easy
to swap through hole 1/4W types
Chris Albertson
Redondo Beach, California
JA
John Ackermann N8UR
Sun, Mar 25, 2012 7:53 PM
I haven't measured the video amps, but here are plots of an HP 5087A,
TADD-1, and Spectracom 8140 tap unit for a baseline:
http://febo.com/pages/amplifier_phase_noise/
John
Tom Knox said the following on 03/25/2012 03:48 PM:
Has anyone measured Phase Noise on any of these distribution amps? By looking at how widely the PN specs vary on the application specific Symmetricom and HP DA's it would be interesting to see how well these video da's perform in comparison.
Thomas Knox
Date: Sun, 25 Mar 2012 12:28:56 -0700
From: pete@petelancashire.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
One thing to watch out for is what cards they have in them.
-pete
On Sun, Mar 25, 2012 at 11:39 AM, paul swedpaulswedb@gmail.com wrote:
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the whole tray for some silly amount of $ 20 I think.
I prefer the simple 8601 DAs but have 8604 delay days and they can all be
made into simple DAs with a few jumpers that are on the boards.
I have also used a rgb da 6 output for each channel. No issue at all.
One comment you would want to insure the amps are ac coupled and clamping
turned off since there is no sync signal to establish the clamp level.
Regards
Paul
WB8TSL
On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths<bruce.griffiths@xtra.co.nz
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
I have seen suggestions for using a video distributiution unit.
But in my part of the world (EU) , there isn't a lot on "eby".
I have seen some RGB amps , and was wondering if i could use those ?
Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
B ?
I'm not experienced (yet) in the analog domain.
If i go (simple diy) Would this one work (also wo. the trafo's) ?
http://www.oz9fw.dk/PDF%**20files/rubidium.pdfhttp://www.oz9fw.dk/PDF%20files/rubidium.pdf
I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
to salvage if needed.
Thanx for any input/hints
CFo - T-Nut beginner Denmark.
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Winding your own transformers isnt particularly difficult if you have
suitable (binocular) cores.
The discrete amplifier shown has a class AB output stage, lower distortion
is possible if a class A output stage is used (requires an extra resistor
between the output stage emitters and an additional diode in series with
the LED).
With a Class A output stage the 39 ohm resistors should be replaced by a a
pair of 100 ohm resistors to match the load.
Significantly lower distortion is possible if feedback from the output to
the input stage is used.
If the feedback gain is unity (or less) at dc higher AC gains won't
significantly degrade the close in phase noise.
A different amplifier topology using the same number of transistors will
allow a higher reverse isolation to be achieved.
One problem with video distribution units (aside from the relatively high
phase noise floor) is the limited output drive available. For some purposes
16-20dBm outputs are desirable.
Bruce
_____________**
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/**
mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I haven't measured the video amps, but here are plots of an HP 5087A,
TADD-1, and Spectracom 8140 tap unit for a baseline:
http://febo.com/pages/amplifier_phase_noise/
John
----
Tom Knox said the following on 03/25/2012 03:48 PM:
>
> Has anyone measured Phase Noise on any of these distribution amps? By looking at how widely the PN specs vary on the application specific Symmetricom and HP DA's it would be interesting to see how well these video da's perform in comparison.
> Thomas Knox
>
>
>
>> Date: Sun, 25 Mar 2012 12:28:56 -0700
>> From: pete@petelancashire.com
>> To: time-nuts@febo.com
>> Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
>>
>> Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
>> front porch next week. Its bandwidth is spec'd at 30 MHz.
>>
>> The only question I have on using DA's is the effect of them being designed to
>> work in a 75 ohm environment.
>>
>> One thing to watch out for is what cards they have in them.
>>
>> -pete
>>
>>
>>
>> On Sun, Mar 25, 2012 at 11:39 AM, paul swed<paulswedb@gmail.com> wrote:
>>> Well the easy answer.
>>> The older 1984 video amps would roll off above 6 MC or so.
>>> However as the IC technology took over they easily could do 30 Mhz.
>>> I have used Grass valley 8500 series for at least 10-15 years and the work
>>> very well.
>>> I also have sets of Leitch DAs that are fine.
>>> Picked up the whole tray for some silly amount of $ 20 I think.
>>> I prefer the simple 8601 DAs but have 8604 delay days and they can all be
>>> made into simple DAs with a few jumpers that are on the boards.
>>> I have also used a rgb da 6 output for each channel. No issue at all.
>>> One comment you would want to insure the amps are ac coupled and clamping
>>> turned off since there is no sync signal to establish the clamp level.
>>> Regards
>>> Paul
>>> WB8TSL
>>>
>>> On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths<bruce.griffiths@xtra.co.nz
>>>> wrote:
>>>
>>>> cfo wrote:
>>>>
>>>>> I need a distribution amp for my Tbolt , with 6..8+ outputs
>>>>>
>>>>> The TAPR-1 is NA , and the successor status is ???.
>>>>>
>>>>> I need it for distributing 10Mhz ref-clock to Counters
>>>>> (HP,Racal,Phillips), a Rigol Sig-gen& maybe Oscilloscopes etc.
>>>>>
>>>>>
>>>>> It's for "better than ocxo/hobby use" , and not Tnut (ps accuracy).
>>>>>
>>>>> I have seen suggestions for using a video distributiution unit.
>>>>> But in my part of the world (EU) , there isn't a lot on "eby".
>>>>> I have seen some RGB amps , and was wondering if i could use those ?
>>>>>
>>>>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on
>>>>> B ?
>>>>>
>>>>> I'm not experienced (yet) in the analog domain.
>>>>>
>>>>> If i go (simple diy) Would this one work (also wo. the trafo's) ?
>>>>> http://www.oz9fw.dk/PDF%**20files/rubidium.pdf<http://www.oz9fw.dk/PDF%20files/rubidium.pdf>
>>>>>
>>>>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able
>>>>> to salvage if needed.
>>>>>
>>>>> Thanx for any input/hints
>>>>>
>>>>> CFo - T-Nut beginner Denmark.
>>>>>
>>>>>
>>>>>
>>>>> ______________________________**_________________
>>>>> time-nuts mailing list -- time-nuts@febo.com
>>>>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>>>>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>>>> and follow the instructions there.
>>>>>
>>>>>
>>>>>
>>>> Winding your own transformers isnt particularly difficult if you have
>>>> suitable (binocular) cores.
>>>> The discrete amplifier shown has a class AB output stage, lower distortion
>>>> is possible if a class A output stage is used (requires an extra resistor
>>>> between the output stage emitters and an additional diode in series with
>>>> the LED).
>>>> With a Class A output stage the 39 ohm resistors should be replaced by a a
>>>> pair of 100 ohm resistors to match the load.
>>>> Significantly lower distortion is possible if feedback from the output to
>>>> the input stage is used.
>>>> If the feedback gain is unity (or less) at dc higher AC gains won't
>>>> significantly degrade the close in phase noise.
>>>> A different amplifier topology using the same number of transistors will
>>>> allow a higher reverse isolation to be achieved.
>>>>
>>>> One problem with video distribution units (aside from the relatively high
>>>> phase noise floor) is the limited output drive available. For some purposes
>>>> 16-20dBm outputs are desirable.
>>>>
>>>> Bruce
>>>>
>>>>
>>>> ______________________________**_________________
>>>> time-nuts mailing list -- time-nuts@febo.com
>>>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>>>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>>>> and follow the instructions there.
>>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
PL
Pete Lancashire
Sun, Mar 25, 2012 7:58 PM
I'm 99% sure that is all it is .. one thing nice about using something
designed 20 yrs
ago is it wont be a hybrid with the termination on the ceramic. :-)
On Sun, Mar 25, 2012 at 12:51 PM, Chris Albertson
albertson.chris@gmail.com wrote:
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
Swap out a few resistors and you can fix the above problem. unless
they used those 75 ohm BNCs but those are rare and if you are a true
"nut" you can replace them. In my amp the resistors are all very easy
to swap through hole 1/4W types
Chris Albertson
Redondo Beach, California
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I'm 99% sure that is all it is .. one thing nice about using something
designed 20 yrs
ago is it wont be a hybrid with the termination on the ceramic. :-)
On Sun, Mar 25, 2012 at 12:51 PM, Chris Albertson
<albertson.chris@gmail.com> wrote:
> On Sun, Mar 25, 2012 at 12:28 PM, Pete Lancashire
> <pete@petelancashire.com> wrote:
>
>>
>> The only question I have on using DA's is the effect of them being designed to
>> work in a 75 ohm environment.
>
> Swap out a few resistors and you can fix the above problem. unless
> they used those 75 ohm BNCs but those are rare and if you are a true
> "nut" you can replace them. In my amp the resistors are all very easy
> to swap through hole 1/4W types
>
>
> Chris Albertson
> Redondo Beach, California
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
C
cfo
Sun, Mar 25, 2012 8:02 PM
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
Thanx Bruce
I'm an analog noob , so i have some questions.
If i multiply that schematic by 8 , could i then just add the Tbolt input
at all V1's ?
Should R15 + C11 + C12 also be multiplied ?
Is V2 a 12v supply (i suppose so) ?
Could i replace the 2N3904 with BC850LT1 (smd) , and the 2N3906 with
BC856ALT1 (smd) , else i have some BC337/BC327 - TO92 (non smd)
Would one chan work on a perf-board with wires (proof of concept) , or
would it be to "RF sensitive" ?
regards
CFO
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
> Bruce Griffiths wrote:
> A circuit schematic for a current feedback triple with reasonably low
> noise and distortion is attached.
>
> Bruce
Thanx Bruce
I'm an analog noob , so i have some questions.
If i multiply that schematic by 8 , could i then just add the Tbolt input
at all V1's ?
Should R15 + C11 + C12 also be multiplied ?
Is V2 a 12v supply (i suppose so) ?
Could i replace the 2N3904 with BC850LT1 (smd) , and the 2N3906 with
BC856ALT1 (smd) , else i have some BC337/BC327 - TO92 (non smd)
Would one chan work on a perf-board with wires (proof of concept) , or
would it be to "RF sensitive" ?
regards
CFO
PS
paul swed
Sun, Mar 25, 2012 8:09 PM
Thats the RGB amps I have used the Extrons. Its in the basement and worked
very well.
Could not remember the name.
On Sun, Mar 25, 2012 at 4:02 PM, cfo xnews3@luna.dyndns.dk wrote:
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
Thanx Bruce
I'm an analog noob , so i have some questions.
If i multiply that schematic by 8 , could i then just add the Tbolt input
at all V1's ?
Should R15 + C11 + C12 also be multiplied ?
Is V2 a 12v supply (i suppose so) ?
Could i replace the 2N3904 with BC850LT1 (smd) , and the 2N3906 with
BC856ALT1 (smd) , else i have some BC337/BC327 - TO92 (non smd)
Would one chan work on a perf-board with wires (proof of concept) , or
would it be to "RF sensitive" ?
regards
CFO
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
Thats the RGB amps I have used the Extrons. Its in the basement and worked
very well.
Could not remember the name.
On Sun, Mar 25, 2012 at 4:02 PM, cfo <xnews3@luna.dyndns.dk> wrote:
> On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
>
> > Bruce Griffiths wrote:
>
> > A circuit schematic for a current feedback triple with reasonably low
> > noise and distortion is attached.
> >
> > Bruce
>
> Thanx Bruce
>
> I'm an analog noob , so i have some questions.
>
> If i multiply that schematic by 8 , could i then just add the Tbolt input
> at all V1's ?
>
> Should R15 + C11 + C12 also be multiplied ?
>
> Is V2 a 12v supply (i suppose so) ?
>
> Could i replace the 2N3904 with BC850LT1 (smd) , and the 2N3906 with
> BC856ALT1 (smd) , else i have some BC337/BC327 - TO92 (non smd)
>
> Would one chan work on a perf-board with wires (proof of concept) , or
> would it be to "RF sensitive" ?
>
> regards
> CFO
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
G
gary
Sun, Mar 25, 2012 11:39 PM
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current out of the base. That
is, I don't see a DC bias on Q3.
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current out of the base. That
is, I don't see a DC bias on Q3.
D
David
Mon, Mar 26, 2012 12:05 AM
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current out of the base. That
is, I don't see a DC bias on Q3.
R7, R8, and LED D2 sets the base voltage at about 1.8 volts through
R4. Subtract Vbe and Q3's idle current will be about 36 milliamps set
by 1.2 volts across the 33 ohm emitter resistor.
On Sun, 25 Mar 2012 16:39:57 -0700, gary <lists@lazygranch.com> wrote:
>I'm not so sure about the circuit. The base drive on Q3 is more of less
>AC given that the resistor can only pull current out of the base. That
>is, I don't see a DC bias on Q3.
R7, R8, and LED D2 sets the base voltage at about 1.8 volts through
R4. Subtract Vbe and Q3's idle current will be about 36 milliamps set
by 1.2 volts across the 33 ohm emitter resistor.
G
gary
Mon, Mar 26, 2012 12:26 AM
Gotcha. LEDs are hetero junction, yielding more than a diode drop.
On 3/25/2012 5:05 PM, David wrote:
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current out of the base. That
is, I don't see a DC bias on Q3.
Gotcha. LEDs are hetero junction, yielding more than a diode drop.
On 3/25/2012 5:05 PM, David wrote:
> On Sun, 25 Mar 2012 16:39:57 -0700, gary<lists@lazygranch.com> wrote:
>
>> I'm not so sure about the circuit. The base drive on Q3 is more of less
>> AC given that the resistor can only pull current out of the base. That
>> is, I don't see a DC bias on Q3.
>
> R7, R8, and LED D2 sets the base voltage at about 1.8 volts through
> R4. Subtract Vbe and Q3's idle current will be about 36 milliamps set
> by 1.2 volts across the 33 ohm emitter resistor.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
G
gary
Mon, Mar 26, 2012 12:35 AM
I forgot to mention that those old jedec part numbers specify a package
and electrical limit under one part number. That is, you can't find say
a 1n914 in SMD, but you can find direct equivalents with other numbers.
You will find supply houses listing SMD versions of jedec parts, but
technically that is not correct.
Anyway, there are probably direct electrical versions of the 2n3904 and
2n3906. For example MMBT3904.
I assume when ICs hit the market the idea of making the package be a
suffix evolved rather than making the die and package be one specific
number.
I forgot to mention that those old jedec part numbers specify a package
and electrical limit under one part number. That is, you can't find say
a 1n914 in SMD, but you can find direct equivalents with other numbers.
You will find supply houses listing SMD versions of jedec parts, but
technically that is not correct.
Anyway, there are probably direct electrical versions of the 2n3904 and
2n3906. For example MMBT3904.
I assume when ICs hit the market the idea of making the package be a
suffix evolved rather than making the die and package be one specific
number.
JH
Javier Herrero
Mon, Mar 26, 2012 12:48 AM
El 26/03/2012 02:35, gary escribió:
I forgot to mention that those old jedec part numbers specify a
package and electrical limit under one part number. That is, you can't
find say a 1n914 in SMD, but you can find direct equivalents with
other numbers. You will find supply houses listing SMD versions of
jedec parts, but technically that is not correct.
Oh, you can :) MMBD914 (SOT-23), 1N914BWT /SOD-523F) and some more.
Regards,
Javier
El 26/03/2012 02:35, gary escribió:
> I forgot to mention that those old jedec part numbers specify a
> package and electrical limit under one part number. That is, you can't
> find say a 1n914 in SMD, but you can find direct equivalents with
> other numbers. You will find supply houses listing SMD versions of
> jedec parts, but technically that is not correct.
Oh, you can :) MMBD914 (SOT-23), 1N914BWT /SOD-523F) and some more.
Regards,
Javier
G
gary
Mon, Mar 26, 2012 1:54 AM
MMBD914 !=1n914.
1n914BWTm i.e. using a suffix, is something I haven't seen before, but
technically
1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a
diode in that glass package.
On 3/25/2012 5:48 PM, Javier Herrero wrote:
El 26/03/2012 02:35, gary escribió:
I forgot to mention that those old jedec part numbers specify a
package and electrical limit under one part number. That is, you can't
find say a 1n914 in SMD, but you can find direct equivalents with
other numbers. You will find supply houses listing SMD versions of
jedec parts, but technically that is not correct.
MMBD914 !=1n914.
1n914BWTm i.e. using a suffix, is something I haven't seen before, but
technically
1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a
diode in that glass package.
On 3/25/2012 5:48 PM, Javier Herrero wrote:
> El 26/03/2012 02:35, gary escribió:
>> I forgot to mention that those old jedec part numbers specify a
>> package and electrical limit under one part number. That is, you can't
>> find say a 1n914 in SMD, but you can find direct equivalents with
>> other numbers. You will find supply houses listing SMD versions of
>> jedec parts, but technically that is not correct.
> Oh, you can :) MMBD914 (SOT-23), 1N914BWT /SOD-523F) and some more.
>
> Regards,
>
> Javier
>
> _______________________________________________
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