Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

[Adrian Godwin]

A similar product is the Polar Toneohm. I've been after one for a while but
they seem to go for high prices.



On Mon, Jan 1, 2018 at 12:12 AM, Gary Woods 
wrote:

> On Sun, 31 Dec 2017 20:56:26 +0100, you wrote:
>
> > Without a thermal camera I've used a 4-1/2 digit DVM set for 200mV full
> scale, or 20mV if you can do that. Often the low uV resolution will allow
> you to trace the current path, just start at the power and ground inputs to
> the board and follow the voltage drops to the short. Or go old-school with
> an HP logic pulser and current probe...
> OK, I think, made an audible low-ohm probe "Shortsqueak?"  That can
> resolve an inch or less of PC board trace.  You can't have mine!
>
>
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Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

[Gary Woods]

On Sun, 31 Dec 2017 20:56:26 +0100, you wrote:

> Without a thermal camera I've used a 4-1/2 digit DVM set for 200mV full 
> scale, or 20mV if you can do that. Often the low uV resolution will allow you 
> to trace the current path, just start at the power and ground inputs to the 
> board and follow the voltage drops to the short. Or go old-school with an HP 
> logic pulser and current probe...
OK, I think, made an audible low-ohm probe "Shortsqueak?"  That can
resolve an inch or less of PC board trace.  You can't have mine!


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Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

[Azelio Boriani]

The GPS receiver featured in the picture at

is a Motorola UT+.
My OSA4351 has a Motorola GPS receiver.

On Sun, Dec 31, 2017 at 7:43 PM, Gregory Beat  wrote:
> Oscilloquartz OSA-4530 GPSDO : 2-page product brochure
> http://syncarchitect.com/downloads/PDF_0018_453X.pdf
>
> Magnus Danielson picked one up five years ago, but didn’t find the software.
> https://www.febo.com/pipermail/time-nuts/2012-December/073331.html
>
> The OSA 4530 is a three board design, with bottom board being power and 
> control board, middle board being OCXO, output buffer, PPS and time measure, 
> and third board the Navicom GPS receiver board.
>
> Features an OSA 8663-B6SG double-oven SC-cut, a Navicom GPcore Sync 15 GPS 
> receiver, based on the Zarlink GP4020 chip, and a RAKON 10 MHz reference.
>
> Are you going to swap out the DC-DC module?
>
> Oscilloquartz SA
> Avenue des Pâquiers 1
> 2072 Saint-Blaise
> Switzerland
>
> SyncView Plus
> http://oscilloquartz.com/files/1403600295-2014-06_DS_OSASyncViewPlus.pdf
>
> greg
> Sent from iPad Air
> ==
> From: Mark Sims 
> To: "time-nuts@febo.com" 
> Subject: [time-nuts] Oscilloquartz OSA-4530 GPSDO
>
> The 4530 GPSDO arrived, but was dead.   Looks like the DC-DC that makes 5V is 
> bad.   The seller sent a replacement unit that seems to be working.
>
> Also a list member sent me a copy of the 4531 manual.  The commands listed 
> are very similar to the Star-4 commands.  But sending any of the 4531 
> commands to the 4530 returns an "invalid command" response... strange, the 
> 4531 manual sort of implies most should work with the 4530.
>
> So, I'm still looking for a 4530 manual or the OSA control software...  does 
> anybody know where I can find it?
>
> --
>
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Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

[Robert LaJeunesse]

Mark, best to use an adjustable current (current-limited) supply preset to 
voltage regulate at 5V. That way you can have some control over the power 
dissipated on the PCB. If you can, borrow a thermal camera and look for the 
heat with that. (FYI our local library lends them out.) Without a thermal 
camera I've used a 4-1/2 digit DVM set for 200mV full scale, or 20mV if you can 
do that. Often the low uV resolution will allow you to trace the current path, 
just start at the power and ground inputs to the board and follow the voltage 
drops to the short. Or go old-school with an HP logic pulser and current 
probe...

> Sent: Sunday, December 31, 2017 at 2:15 PM
> From: "Mark Sims" 
> To: "time-nuts@febo.com" 
> Subject: [time-nuts] Oscilloquartz OSA-4350 GPSDO
>
> I disassembled the unit and found that +5V is shorted to ground on the top 
> board.   No shorted tantalum caps or obvious failed parts.  I am beginning to 
> think it may be power/ground planes are shorted on the four layer board (all 
> boards are four layer)... probably wasted $20 on a DC-DC.  It's not going to 
> be easy tracking down the short.   Maybe apply a high-current 5V supply and 
> see what gets hot.
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Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

[Gregory Beat]

Oscilloquartz OSA-4530 GPSDO : 2-page product brochure
http://syncarchitect.com/downloads/PDF_0018_453X.pdf

Magnus Danielson picked one up five years ago, but didn’t find the software.
https://www.febo.com/pipermail/time-nuts/2012-December/073331.html

The OSA 4530 is a three board design, with bottom board being power and control 
board, middle board being OCXO, output buffer, PPS and time measure, and third 
board the Navicom GPS receiver board.

Features an OSA 8663-B6SG double-oven SC-cut, a Navicom GPcore Sync 15 GPS 
receiver, based on the Zarlink GP4020 chip, and a RAKON 10 MHz reference.

Are you going to swap out the DC-DC module?

Oscilloquartz SA
Avenue des Pâquiers 1
2072 Saint-Blaise
Switzerland

SyncView Plus
http://oscilloquartz.com/files/1403600295-2014-06_DS_OSASyncViewPlus.pdf

greg
Sent from iPad Air
==
From: Mark Sims 
To: "time-nuts@febo.com" 
Subject: [time-nuts] Oscilloquartz OSA-4530 GPSDO

The 4530 GPSDO arrived, but was dead.   Looks like the DC-DC that makes 5V is 
bad.   The seller sent a replacement unit that seems to be working.  

Also a list member sent me a copy of the 4531 manual.  The commands listed are 
very similar to the Star-4 commands.  But sending any of the 4531 commands to 
the 4530 returns an "invalid command" response... strange, the 4531 manual sort 
of implies most should work with the 4530. 

So, I'm still looking for a 4530 manual or the OSA control software...  does 
anybody know where I can find it?

--

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