[time-nuts] Question about specifications for Quartzlock GPS antenna down-converter

Brooke Clarke brooke at pacific.net
Sat Mar 14 16:22:25 UTC 2009

Hi Russell:

I have a similar problem with a Quantic Q-5200/SM Timing GPS Receiver.
The Q5200 sends both +15 Vdc power and a 11.114 MHz reference frequency up the 
cable to the Antenna Module. The Antenna Module receives the satellite L1 
frequency and down converts the signal to an IF of 153.028 MHz which is sent 
down the cable to the receiver.

I have tabulated the frequency and other info for a number of the GPS signals 
at:  http://www.prc68.com/I/DAGR.shtml#GPSs

In this case L1 = 1575.42 which is 154 * 10.23

Without the proper antenna the receiver can not operate.
Have Fun,

Brooke Clarke

Russell Rezaian wrote:
> Hi all,
> I have found myself with a GPS clock that is labeled as requiring a 
> GPS down converter antenna.  It won't sync to any of my normal 
> antennas.  Looks like it has an up-converter integrated into the 
> receiver directly.
> So far so good.  I think I may have found an antenna with a built in 
> down-converter, so we'll see how well that works.
> However, in addition, I just happen to have a Quartzlock GPS antenna 
> down converter sitting in my office at work which I have never used 
> personally.  It was handed to me a while back by someone who knows I 
> am interested in such things.
> Now I have no specs for this little grey box.  It uses an N style 
> connector for antenna in, and a TNC  connector for signal out.  It's 
> labeled with Quartzlock as the manufacturer, and shows their UK web 
> site.  There's no model number designation I can see.
> A few web searches have so far failed to show any references to 
> specification documents.
> So I am not sure what voltages it requires or supports.  There's no 
> external power connection which tends to lead me to suspect that it 
> expects to get power from the RF cables.
> Has anyone used one of these?  Any pointers to reference information 
> would be appreciated.
> Thanks!
> --
> Russell
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