[time-nuts] Symmetricom TimeSource 3000 3500 Question

k4cle at aol.com k4cle at aol.com
Wed Dec 4 19:56:10 EST 2013


Skip, that unit was designed for a GPS downconverter.  I don't know the  
exact requirements but most external antenna units generated a 75.42 MHz or  
35.42 MHz IF as a downconverted signal from the 1575.42 MHz GPS frequency.   
Most users would abandon the antenna sine it involved additional effort to  
dismantle!  So, you might want to think about building your own  
downconverter as those antennas seldom appear on the used market.  Sorry!  

Connected by DROID on Verizon Wireless

-----Original message-----
From: Skip Withrow <skip.withrow at gmail.com>
To: time-nuts at febo.com
Sent: Thu, Dec 5, 2013 00:23:17 GMT+00:00
Subject: [time-nuts] Symmetricom TimeSource 3000 3500 Question

Hello Nuts,

I have a Symmetricom 3500 shelf minus GPS receiver.  The 3xxx series looks
like it uses a proprietary IF interface that shoots 18V up to the GPS
receiver, and I don't know what comes down.  There has to be data though
since the box can report lat and lon.  Don't know if there is also any
frequency reference signal, but based on the function of the box you might
think that there is.  The physical interface is just a single piece of coax.

Does anyone know what the 'proprietary IF interface' is?  Does anyone have
an extra GPS receiver laying around that they would like to get tid of (or
where I could find one) for these boxes?

Thanks in advance.

Skip Withrow
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