Re: [time-nuts] HP 58516A GPS distribution amplifier information
I recommend un-screwing that SMC since it is almost impossible to find the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the power.
Bruce
SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
It is not impossible. I have a cable suitable for it, but we used SMC in
a product once, so I had a spare SMC-SMB cable lying around.
Using a SMC for power may be a bit unconventional thought.
Cheers,
Magnus
Magnus Danielson wrote:
SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to
find the mate, and feeding two wires from a 5V supply into the unit
through the hole, and soldering the wires to the PCB. Works well for
me.
It is not impossible. I have a cable suitable for it, but we used SMC
in a product once, so I had a spare SMC-SMB cable lying around.
Using a SMC for power may be a bit unconventional thought.
Cheers,
Magnus
I have several also, they are actually quite easy to get at this end of
the Earth.
Bruce
Hi
I found a SMC-BNC adapter of the correct orientation in the bottom of my junk box. Somehow I doubt I'll ever use it for anything else. BNC cables and jacks are something I can find easily.
The top of the unit is held on with screws so getting inside it should not be very hard. You could swap the SMC out to something that's more common for power distribution. Maybe an APC-7 ...
My guess is they used the SMC because it's unusual. That way you don't get a cable with 30 VDC on it hooked where it shouldn't go. If you did run a 30 volt supply the dc could do some damage. Of course 30 volts on that unit connected to a "normal" antenna would do some damage as well.
Bob
On Jan 27, 2010, at 1:14 AM, SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the power.
Bruce
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Hi,
Another option is to remove the DC-block cap on port 1. Then let your
primary GPS power the splitter and upstream antenna.
http://www.to-way.com/tf/hp58516a.pdf
--
Björn
Hi
I found a SMC-BNC adapter of the correct orientation in the bottom of my
junk box. Somehow I doubt I'll ever use it for anything else. BNC cables
and jacks are something I can find easily.
The top of the unit is held on with screws so getting inside it should not
be very hard. You could swap the SMC out to something that's more common
for power distribution. Maybe an APC-7 ...
My guess is they used the SMC because it's unusual. That way you don't get
a cable with 30 VDC on it hooked where it shouldn't go. If you did run a
30 volt supply the dc could do some damage. Of course 30 volts on that
unit connected to a "normal" antenna would do some damage as well.
Bob
On Jan 27, 2010, at 1:14 AM, SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find
the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the
power.
Bruce
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Hi
Has anybody torn into one to see how easy/hard that would be? Sometimes HP's
construction techniques are not very "hacker friendly"..
Since you probably will have multiple GPS's on the gizmo (why have it
otherwise...) Leaving the 200 ohm DC resistors in place does not sound like
a problem. Maybe you short out two of the DC blocks rather than just one.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of bg@lysator.liu.se
Sent: Wednesday, January 27, 2010 9:41 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 58516A GPS distribution amplifier information
Hi,
Another option is to remove the DC-block cap on port 1. Then let your
primary GPS power the splitter and upstream antenna.
http://www.to-way.com/tf/hp58516a.pdf
--
Björn
Hi
I found a SMC-BNC adapter of the correct orientation in the bottom of my
junk box. Somehow I doubt I'll ever use it for anything else. BNC cables
and jacks are something I can find easily.
The top of the unit is held on with screws so getting inside it should not
be very hard. You could swap the SMC out to something that's more common
for power distribution. Maybe an APC-7 ...
My guess is they used the SMC because it's unusual. That way you don't get
a cable with 30 VDC on it hooked where it shouldn't go. If you did run a
30 volt supply the dc could do some damage. Of course 30 volts on that
unit connected to a "normal" antenna would do some damage as well.
Bob
On Jan 27, 2010, at 1:14 AM, SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find
the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the
power.
Bruce
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Bob Camp wrote:
Hi
Has anybody torn into one to see how easy/hard that would be? Sometimes HP's
construction techniques are not very "hacker friendly"..
Bob, I had to do that because my 8 way version came from the swap meet
fried ( it was only $5). The circuitry inside is very obvious since it
is all surface mount.
Since you probably will have multiple GPS's on the gizmo (why have it
otherwise...) Leaving the 200 ohm DC resistors in place does not sound like
a problem. Maybe you short out two of the DC blocks rather than just one.
Converting it to be powered from the No 1 output is easy, but you do
NOT want to try to power the antenna from two outputs. Unless you want a
schizoid divider.
Dan
Hi
I'm sitting here looking at the spec sheet for the splitter:
A normal four way splitter should have a loss of a bit over 6 db.
The reason that's bad is that it may degrade the noise figure at your
otherwise perfect receiver (and sub 1 db noise figure antenna) by 6 db. (it
may also do absolutely nothing bad at all)
The splitter has a rated noise figure of 7 db max / 5 db typical.
It has a gain that may be a loss of 3 db or a gain of 3 db.
Worst case, it's got a -3db gain and a 7 db noise figure. It may degrade the
noise figure at the receiver by 10 db. Best case it's got 3 db of gain and a
5 db noise figure. That's still a noise figure hit of 5 db.
All of that is pretty easy to blow holes in as far as a real / normally
operating system is concerned. I think it's pretty close in the limit case
though.
If it is close, then the part (yes I bought one to) might improve things by
1 db. It also might degrade things by 4 db under the worst case conditions
where it likely matters.
Am I missing something here? Obviously it does more than split. It may have
better isolation than a conventional splitter. It also has the cute little
DC loads in it.
Seems like a little bit more RF gain might have been a good idea.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of bg@lysator.liu.se
Sent: Wednesday, January 27, 2010 9:41 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 58516A GPS distribution amplifier information
Hi,
Another option is to remove the DC-block cap on port 1. Then let your
primary GPS power the splitter and upstream antenna.
http://www.to-way.com/tf/hp58516a.pdf
--
Björn
Hi
I found a SMC-BNC adapter of the correct orientation in the bottom of my
junk box. Somehow I doubt I'll ever use it for anything else. BNC cables
and jacks are something I can find easily.
The top of the unit is held on with screws so getting inside it should not
be very hard. You could swap the SMC out to something that's more common
for power distribution. Maybe an APC-7 ...
My guess is they used the SMC because it's unusual. That way you don't get
a cable with 30 VDC on it hooked where it shouldn't go. If you did run a
30 volt supply the dc could do some damage. Of course 30 volts on that
unit connected to a "normal" antenna would do some damage as well.
Bob
On Jan 27, 2010, at 1:14 AM, SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find
the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the
power.
Bruce
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.
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To unsubscribe, go to
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and follow the instructions there.
The noise figure hit may be nowhere as bad as 5dB because it depends on the
noise figure and gain of the antenna preamplifier, not just the noise
figure.
John WA4WDL
From: "Bob Camp" lists@cq.nu
Sent: Wednesday, January 27, 2010 12:34 PM
To: "'Discussion of precise time and frequency measurement'"
time-nuts@febo.com
Subject: Re: [time-nuts] HP 58516A GPS distribution amplifier information
Hi
I'm sitting here looking at the spec sheet for the splitter:
A normal four way splitter should have a loss of a bit over 6 db.
The reason that's bad is that it may degrade the noise figure at your
otherwise perfect receiver (and sub 1 db noise figure antenna) by 6 db.
(it
may also do absolutely nothing bad at all)
The splitter has a rated noise figure of 7 db max / 5 db typical.
It has a gain that may be a loss of 3 db or a gain of 3 db.
Worst case, it's got a -3db gain and a 7 db noise figure. It may degrade
the
noise figure at the receiver by 10 db. Best case it's got 3 db of gain and
a
5 db noise figure. That's still a noise figure hit of 5 db.
All of that is pretty easy to blow holes in as far as a real / normally
operating system is concerned. I think it's pretty close in the limit
case
though.
If it is close, then the part (yes I bought one to) might improve things
by
1 db. It also might degrade things by 4 db under the worst case conditions
where it likely matters.
Am I missing something here? Obviously it does more than split. It may
have
better isolation than a conventional splitter. It also has the cute little
DC loads in it.
Seems like a little bit more RF gain might have been a good idea.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of bg@lysator.liu.se
Sent: Wednesday, January 27, 2010 9:41 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 58516A GPS distribution amplifier information
Hi,
Another option is to remove the DC-block cap on port 1. Then let your
primary GPS power the splitter and upstream antenna.
http://www.to-way.com/tf/hp58516a.pdf
--
Björn
Hi
I found a SMC-BNC adapter of the correct orientation in the bottom of my
junk box. Somehow I doubt I'll ever use it for anything else. BNC cables
and jacks are something I can find easily.
The top of the unit is held on with screws so getting inside it should
not
be very hard. You could swap the SMC out to something that's more common
for power distribution. Maybe an APC-7 ...
My guess is they used the SMC because it's unusual. That way you don't
get
a cable with 30 VDC on it hooked where it shouldn't go. If you did run a
30 volt supply the dc could do some damage. Of course 30 volts on that
unit connected to a "normal" antenna would do some damage as well.
Bob
On Jan 27, 2010, at 1:14 AM, SAIDJACK@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find
the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
bye,
Said
In a message dated 1/26/2010 18:36:18 Pacific Standard Time,
bruce.griffiths@xtra.co.nz writes:
I'm using an HP 58516A GPS distribution amplifier to share my GPS
antenna between my receivers.
What is the proper part number or connector "name" for the power
supply connector ?
Thanks for your help !
Claude
According to the datasheet option 05 uses an SMC connector for the
power.
Bruce
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
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and follow the instructions there.
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To unsubscribe, go to
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Hi
I think the big issue with two receivers is if one of them powers down and
the other stays up. Then you try to back feed the one that's power down.
That may or may not be good for it's health. I'd hope there's a diode or
something like a diode in the DC path to protect it. It would be pretty easy
to double check.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Dan Rae
Sent: Wednesday, January 27, 2010 12:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 58516A GPS distribution amplifier information
Bob Camp wrote:
Hi
Has anybody torn into one to see how easy/hard that would be? Sometimes
HP's
construction techniques are not very "hacker friendly"..
Bob, I had to do that because my 8 way version came from the swap meet
fried ( it was only $5). The circuitry inside is very obvious since it
is all surface mount.
Since you probably will have multiple GPS's on the gizmo (why have it
otherwise...) Leaving the 200 ohm DC resistors in place does not sound
like
a problem. Maybe you short out two of the DC blocks rather than just one.
Converting it to be powered from the No 1 output is easy, but you do
NOT want to try to power the antenna from two outputs. Unless you want a
schizoid divider.
Dan
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.