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.
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