[time-nuts] Important parameters for a GPS/GNSS antenna

[John Ackermann N8UR]

Just put the GPS antenna, receiver, battery, and a low power RF 
transmitter modulated by the PPS (wide bandwidth = fast edge time) on 
the turntable, then use an appropriate receiver to demodulate the PPS 
and feed it to the rest of the system.  Put the RX antenna directly 
above (or below) the turntable so the path length remains close to 
constant.  Using FM might also remove Doppler effects from the received 
pulse.

On 5/7/2015 11:18 AM, Tom Van Baak wrote:
>>> I wonder if anybody ever made a rotating GPS antenna to average out the
>>> X-Y phase-center offset ?
>
>> Of course, this does not really work with a gps antenna, unless you
>> put the whole receiver onto the rotary table. But then you shift
>> the problem onto the PPS output (note: amplitude noise translates
>> into phase noise).
>
> Attila,
>
> My thought was to put PHK's proposed experiment entirely on the rotating table: antenna, receiver, local Cs standard, laptop, and battery. You could also get interesting data if you slightly offset the antenna from the center. It would make the ultimate GPS Spirograph. (for those of you under 40, http://en.wikipedia.org/wiki/Spirograph will explain)
>
> /tvb
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