What are the 2 frequencies that you cited? It is highly unlikely
you're transmitting poorly on only one freq, as any modern comm uses
digital frequency synthesis tied to a single reference freq. But at
the extreme ends of the band, both antennas and tuned sections of
comms can fall off markedly in performance. To be unreadable at 3
miles, though, it may take a bit both problems (compromise in the
Archer's location and mistuning in the comm).
The effect would just weak signal, but if garbled, your Europa may
have a nearby VHF antenna or metal piece of just the right size
causing "re-radiation" only at certain freq's. Or maybe this problem,
compounded by the above.
A crude comm tester is a handheld comm, in hands of a buddy at some
distance, with a lousy receiving antenna, such as a stretched out
paper clip in place of the ducky. You want enough noise in the
received transmission to gauge signal strength and still hear any
garbling in the audio. Xmit up the band at whole or half mHz points
ans see what happens.
Regards,
Fred Fillinger, A063
Barry Tennant wrote:
>
> Hi all you radio experts out there.
> I have a particularly annoying problem with my Becker radio and Bob
> Archer antenna.
>
> I have one local airfied (one frequency) that always cannot hear me when
> I try to land. I thought that my radio was broken the first time but
> last week I was there and tried to call them as close as 3 miles and
> they reported that I was unreadable. I immediately called up my home
> field which was 30 NM away for a radio check and was reported reception
> 5.
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