[time-nuts] Req: Decent GPS AntennaActive/Passive Recommendation

[Jim Lux]

On 9/15/13 10:24 PM, David J Taylor wrote:
> From: Bob Camp
>
> Hi
>
> All of the ones I've opened up or seen dis-assembled have had the
> ceramic plate antennas in them. That very much surprised me early on,
> since I *assumed* they had something fancy inside based on their shape.
>
> No argument about the filtering, I'm not sure if the temp-co of filter
> delay on an exposed antenna makes it a plus or a minus….
>
> Bob
> ===================================
>
> .. and would the true time-nut add the delay through the filter to the
> delay in the feeder co-ax?  I suppose that means you could only buy an
> antenna with a stated, calibrated delay?  Limits the choice, a little!
>
>

Of course they would factor all this in.  That's why the UNAVCO site has 
all the phase center locations and delay behavior for the various antennas.