[time-nuts] Question about specifications for Quartzlock GPS antenna down-converter
bg at lysator.liu.se
bg at lysator.liu.se
Sat Mar 14 17:38:43 UTC 2009
Hi Brooke and Russel,
Meinberg does the same thing, but they send a 10MHz - nice choice!! - up
the coax to receive an IF of 35.4MHz.
> 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
> 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
> 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.
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