AT
Anders Time
Fri, Jul 1, 2011 11:33 AM
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
PS
paul swed
Fri, Jul 1, 2011 1:10 PM
bva?
1e-13 seems like a tall order to me.
But I am sure others will have a better idea.
On Fri, Jul 1, 2011 at 7:33 AM, Anders Time anderstime@gmail.com wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
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.
bva?
1e-13 seems like a tall order to me.
But I am sure others will have a better idea.
On Fri, Jul 1, 2011 at 7:33 AM, Anders Time <anderstime@gmail.com> wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
> Have been thinking about dividing the signals down to 1MHz and 100kHz
> and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
> that signal. But I'm worried that the division will generate noise so
> it will not be stable enough?
> Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
> then pll, but the DDS subject seems to bee very difficult to get a
> grip on. Is it possible to generate a signal with that kind of
> stability in the 1s range?
> Thanks
> Anders
>
> _______________________________________________
> 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
Fri, Jul 1, 2011 2:18 PM
To get to 1E-13 I'm thinking you may need to do it the same way you
got the 10MHz Build an ovenized 26Mhz crystal oscillator and
discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time anderstime@gmail.com wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Chris Albertson
Redondo Beach, California
To get to 1E-13 I'm thinking you may need to do it the same way you
got the 10MHz Build an ovenized 26Mhz crystal oscillator and
discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time <anderstime@gmail.com> wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
Chris Albertson
Redondo Beach, California
MD
Magnus Danielson
Fri, Jul 1, 2011 4:30 PM
On 07/01/2011 01:33 PM, Anders Time wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
There are many routes to go through.
For the PLL route you should notice that highest common frequency
between 10 MHz and 26 MHz is 2 MHz, requiring a division of 5 and 13.
A PLL with such ratios becomes fairly simple to achieve lock and
suitable performance. A 26 MHz with low noise should be selected. A
PI-integrator (1 op-amp, 2 resistors and a capacitor) setup is recommended.
For the 19,2 MHz you have 400 kHz as common frequency, which would be
another divide by 5 down from the 2 MHz. A divide by 48 is needed from
the 19,2 MHz side. Similarly a low noise 19,2 MHz should be selected and
a PI loop filter be selected. It should still be fairly easy to get it
to lock properly.
Another approach would be a mixer based approach. For instance will
synchronous dividers be able to provide an interesting solution for 10
MHz to 19,6 MHz by recognizing that 19,6 MHz and 400 kHz both is 9,6 MHz
away from the input, so by setting it up for a 1/25 division you also
achieve the 19,6 MHz directly, with very good phase noise properties.
Achieving the same thing to 26 MHz becomes tricky as the synchronous
divider techniques outputs m/n and 2-m/n the frequency of the input
frequency. Inserting a frequency doubler provides 20 MHz and then 14 MHz
and 26 MHz can be generated.
As for DDS it is a bit tricky to give any clear direction, it's like
saying you should use a PLL or pen. Best result is if the DDS have a the
DDS beat period matching the highest common frequency as presented
above. That way annoying spurious signals can be avoided.
Cheers,
Magnus
On 07/01/2011 01:33 PM, Anders Time wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
> Have been thinking about dividing the signals down to 1MHz and 100kHz
> and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
> that signal. But I'm worried that the division will generate noise so
> it will not be stable enough?
> Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
> then pll, but the DDS subject seems to bee very difficult to get a
> grip on. Is it possible to generate a signal with that kind of
> stability in the 1s range?
There are many routes to go through.
For the PLL route you should notice that highest common frequency
between 10 MHz and 26 MHz is 2 MHz, requiring a division of 5 and 13.
A PLL with such ratios becomes fairly simple to achieve lock and
suitable performance. A 26 MHz with low noise should be selected. A
PI-integrator (1 op-amp, 2 resistors and a capacitor) setup is recommended.
For the 19,2 MHz you have 400 kHz as common frequency, which would be
another divide by 5 down from the 2 MHz. A divide by 48 is needed from
the 19,2 MHz side. Similarly a low noise 19,2 MHz should be selected and
a PI loop filter be selected. It should still be fairly easy to get it
to lock properly.
Another approach would be a mixer based approach. For instance will
synchronous dividers be able to provide an interesting solution for 10
MHz to 19,6 MHz by recognizing that 19,6 MHz and 400 kHz both is 9,6 MHz
away from the input, so by setting it up for a 1/25 division you also
achieve the 19,6 MHz directly, with very good phase noise properties.
Achieving the same thing to 26 MHz becomes tricky as the synchronous
divider techniques outputs m/n and 2-m/n the frequency of the input
frequency. Inserting a frequency doubler provides 20 MHz and then 14 MHz
and 26 MHz can be generated.
As for DDS it is a bit tricky to give any clear direction, it's like
saying you should use a PLL or pen. Best result is if the DDS have a the
DDS beat period matching the highest common frequency as presented
above. That way annoying spurious signals can be avoided.
Cheers,
Magnus
BC
Bob Camp
Fri, Jul 1, 2011 4:58 PM
Hi
What you probably will wind up with is a bit wider PLL bandwidth than 50 Hz.
The noise floor of your dividers and your phase detector will need to be
below that of the BVA. If you divide by 10, then the 20 log N works against
you in this case. Take a look at the phase noise numbers on the OCXO at 100
Hz offset to get an idea of just what you are up against.
Next up, the noise of the output VC(X)O will need to be below the multiplied
noise of the BVA at the cross over frequency. Here you get a benefit from 20
log N. You still will have a hard time beating the 10 MHz OCXO close in.
Phase noise data on both the VC(X)O and the BVA will come in very handy in
figuring things out.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Anders Time
Sent: Friday, July 01, 2011 7:34 AM
To: time-nuts@febo.com
Subject: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
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.
Hi
What you probably will wind up with is a bit wider PLL bandwidth than 50 Hz.
The noise floor of your dividers and your phase detector will need to be
below that of the BVA. If you divide by 10, then the 20 log N works against
you in this case. Take a look at the phase noise numbers on the OCXO at 100
Hz offset to get an idea of just what you are up against.
Next up, the noise of the output VC(X)O will need to be below the multiplied
noise of the BVA at the cross over frequency. Here you get a benefit from 20
log N. You still will have a hard time beating the 10 MHz OCXO close in.
Phase noise data on both the VC(X)O and the BVA will come in very handy in
figuring things out.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Anders Time
Sent: Friday, July 01, 2011 7:34 AM
To: time-nuts@febo.com
Subject: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
_______________________________________________
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.
RK
Rob Kimberley
Fri, Jul 1, 2011 5:29 PM
I think he was talking about stability not accuracy.
1second short term stability on a standard 8600 BVA is 1E-12 and 5E-13 at
10 seconds.
Rob K
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Chris Albertson
Sent: 01 July 2011 3:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
To get to 1E-13 I'm thinking you may need to do it the same way you got the
10MHz Build an ovenized 26Mhz crystal oscillator and discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time anderstime@gmail.com wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
I think he was talking about stability not accuracy.
1second short term stability on a standard 8600 BVA is 1E-12 and 5E-13 at
10 seconds.
Rob K
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Chris Albertson
Sent: 01 July 2011 3:18 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
To get to 1E-13 I'm thinking you may need to do it the same way you got the
10MHz Build an ovenized 26Mhz crystal oscillator and discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time <anderstime@gmail.com> wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
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.
JL
J. L. Trantham
Fri, Jul 1, 2011 8:13 PM
Wouldn't the Shera controller work if you divided the 26 or 19.2 MHz OCXO
into the 1 to 5 MHz range? I seem to recall that the exact frequency was
not critical, just that it was in that range roughly.
Joe
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Chris Albertson
Sent: Friday, July 01, 2011 9:18 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
To get to 1E-13 I'm thinking you may need to do it the same way you
got the 10MHz Build an ovenized 26Mhz crystal oscillator and
discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time anderstime@gmail.com wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Chris Albertson
Redondo Beach, California
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1388 / Virus Database: 1516/3737 - Release Date: 07/01/11
Wouldn't the Shera controller work if you divided the 26 or 19.2 MHz OCXO
into the 1 to 5 MHz range? I seem to recall that the exact frequency was
not critical, just that it was in that range roughly.
Joe
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Chris Albertson
Sent: Friday, July 01, 2011 9:18 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz
To get to 1E-13 I'm thinking you may need to do it the same way you
got the 10MHz Build an ovenized 26Mhz crystal oscillator and
discipline it.
On Fri, Jul 1, 2011 at 4:33 AM, Anders Time <anderstime@gmail.com> wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
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.
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1388 / Virus Database: 1516/3737 - Release Date: 07/01/11
AT
Anders Time
Sat, Jul 2, 2011 6:47 PM
Thanks a lot for the input.
You guys gave me a lot of ideas to work from.
The oscillator is an old 10MHz OCXO BVA(electrodeless quartz crystal) from
"BVA Industries" with one second allan 1e-13 and -125dBc at 1Hz. So i want
to do my best to keep that stability as good as possible at the other needed
frequencies(19.2MHz and 26MHz).
Thanks
Anders
On Fri, Jul 1, 2011 at 1:33 PM, Anders Time anderstime@gmail.com wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
Thanks a lot for the input.
You guys gave me a lot of ideas to work from.
The oscillator is an old 10MHz OCXO BVA(electrodeless quartz crystal) from
"BVA Industries" with one second allan 1e-13 and -125dBc at 1Hz. So i want
to do my best to keep that stability as good as possible at the other needed
frequencies(19.2MHz and 26MHz).
Thanks
Anders
On Fri, Jul 1, 2011 at 1:33 PM, Anders Time <anderstime@gmail.com> wrote:
> I want go generate a stable 26MHz and 19.2MHz signal with stability in
> the 1E-13 range at 1s from my 10MHz BVA.
> Have been thinking about dividing the signals down to 1MHz and 100kHz
> and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
> that signal. But I'm worried that the division will generate noise so
> it will not be stable enough?
> Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
> then pll, but the DDS subject seems to bee very difficult to get a
> grip on. Is it possible to generate a signal with that kind of
> stability in the 1s range?
> Thanks
> Anders
>
DL
Don Latham
Sat, Jul 2, 2011 7:48 PM
Hi Anders:
I need something to give 2.048 MHz from a 10 MHz source, and have not
too aggressively tried to find a way; have followed with interest many
suggestions from TN's. I found a company called Vectron that makes,
ostensibly, very nice frequency translators, with an fin and an fout,
with reasonable phase noise characteristics (?), the data sheets are
available and intriguing, but I spent an hour or more trying to find a
way to actually buy one.
<begin rant>
Vectron, as do many electronics companies, follows a 19th century
marketing plan, with jobbers, distributors, retailers in a long chain of
non-stocking, non-responsive entities. The spec sheets are there to
drool over, and beautiful multicolor full page ads in marketing mags,
but the actual product is like the mystery element nonobtanium...
More modern companies, e.g. Analog Devices, will allow you to buy online
from the factory, for which very much thanks, but I find that the latest
wunderchip, which will apparently do exactly what I require, is usually
labeled with "contact your distributor"
Translated, this phrase means <If you want to consider buying 1,000,000
of these, we'll really make them. Otherwise, forget it.>
I have found this state of affairs true for nearly forty years.
If, as a very small business, or a hobbyist, you can't do it with a
handful of 7400's and 555's, or currently an Arduino :-), forget it.
plus ca change, plus ca mem chose'
<end rant>
Don
Anders Time
Thanks a lot for the input.
You guys gave me a lot of ideas to work from.
The oscillator is an old 10MHz OCXO BVA(electrodeless quartz crystal)
from
"BVA Industries" with one second allan 1e-13 and -125dBc at 1Hz. So i
want
to do my best to keep that stability as good as possible at the other
needed
frequencies(19.2MHz and 26MHz).
Thanks
Anders
On Fri, Jul 1, 2011 at 1:33 PM, Anders Time anderstime@gmail.com
wrote:
I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
Hi Anders:
I need something to give 2.048 MHz from a 10 MHz source, and have not
too aggressively tried to find a way; have followed with interest many
suggestions from TN's. I found a company called Vectron that makes,
ostensibly, very nice frequency translators, with an fin and an fout,
with reasonable phase noise characteristics (?), the data sheets are
available and intriguing, but I spent an hour or more trying to find a
way to actually buy one.
<begin rant>
Vectron, as do many electronics companies, follows a 19th century
marketing plan, with jobbers, distributors, retailers in a long chain of
non-stocking, non-responsive entities. The spec sheets are there to
drool over, and beautiful multicolor full page ads in marketing mags,
but the actual product is like the mystery element nonobtanium...
More modern companies, e.g. Analog Devices, will allow you to buy online
from the factory, for which very much thanks, but I find that the latest
wunderchip, which will apparently do exactly what I require, is usually
labeled with "contact your distributor"
Translated, this phrase means <If you want to consider buying 1,000,000
of these, we'll really make them. Otherwise, forget it.>
I have found this state of affairs true for nearly forty years.
If, as a very small business, or a hobbyist, you can't do it with a
handful of 7400's and 555's, or currently an Arduino :-), forget it.
plus ca change, plus ca mem chose'
<end rant>
Don
Anders Time
> Thanks a lot for the input.
> You guys gave me a lot of ideas to work from.
> The oscillator is an old 10MHz OCXO BVA(electrodeless quartz crystal)
> from
> "BVA Industries" with one second allan 1e-13 and -125dBc at 1Hz. So i
> want
> to do my best to keep that stability as good as possible at the other
> needed
> frequencies(19.2MHz and 26MHz).
> Thanks
> Anders
>
> On Fri, Jul 1, 2011 at 1:33 PM, Anders Time <anderstime@gmail.com>
> wrote:
>
>> I want go generate a stable 26MHz and 19.2MHz signal with stability in
>> the 1E-13 range at 1s from my 10MHz BVA.
>> Have been thinking about dividing the signals down to 1MHz and 100kHz
>> and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
>> that signal. But I'm worried that the division will generate noise so
>> it will not be stable enough?
>> Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
>> then pll, but the DDS subject seems to bee very difficult to get a
>> grip on. Is it possible to generate a signal with that kind of
>> stability in the 1s range?
>> Thanks
>> Anders
>>
> _______________________________________________
> 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.
>
--
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
MD
Magnus Danielson
Sat, Jul 2, 2011 9:11 PM
Don,
On 07/02/2011 09:48 PM, Don Latham wrote:
Hi Anders:
I need something to give 2.048 MHz from a 10 MHz source, and have not
too aggressively tried to find a way; have followed with interest many
suggestions from TN's. I found a company called Vectron that makes,
ostensibly, very nice frequency translators, with an fin and an fout,
with reasonable phase noise characteristics (?), the data sheets are
available and intriguing, but I spent an hour or more trying to find a
way to actually buy one.
Getting 10 MHz to 2,048 MHz isn't all that hard. You can do it in good
old 4000 CMOS series if you need to. What application to you need it
for? I recognice it as a standard telecom frequency and well have in
fact implemented 10 MHz to 2,048 MHz conversion (even if that was not
the primary target). The wideband noise needs isn't very daunting in
telecom applications, but long-term stability is another thing.
If you really do not need to have very good wideband phase-noise, a 4046
and a few dividers will help you.
10 MHz and 2,048 MHz has the highest common frequency in 16 kHz, so you
need to divide by 625 on the 10 MHz and 128 on the 2,048 MHz. If you
settle with the 4046 oscillator or chooses an off the shelf VCXO depends
on what you need, but it is not too hard and too expensive to come by.
Cheers,
Magnus
Don,
On 07/02/2011 09:48 PM, Don Latham wrote:
> Hi Anders:
>
> I need something to give 2.048 MHz from a 10 MHz source, and have not
> too aggressively tried to find a way; have followed with interest many
> suggestions from TN's. I found a company called Vectron that makes,
> ostensibly, very nice frequency translators, with an fin and an fout,
> with reasonable phase noise characteristics (?), the data sheets are
> available and intriguing, but I spent an hour or more trying to find a
> way to actually buy one.
Getting 10 MHz to 2,048 MHz isn't all that hard. You can do it in good
old 4000 CMOS series if you need to. What application to you need it
for? I recognice it as a standard telecom frequency and well have in
fact implemented 10 MHz to 2,048 MHz conversion (even if that was not
the primary target). The wideband noise needs isn't very daunting in
telecom applications, but long-term stability is another thing.
If you really do not need to have very good wideband phase-noise, a 4046
and a few dividers will help you.
10 MHz and 2,048 MHz has the highest common frequency in 16 kHz, so you
need to divide by 625 on the 10 MHz and 128 on the 2,048 MHz. If you
settle with the 4046 oscillator or chooses an off the shelf VCXO depends
on what you need, but it is not too hard and too expensive to come by.
Cheers,
Magnus
