On Thu, 24 Apr 1997 21:34:15 -0400 (EDT) bc215@freenet.carleton.ca (Ric
Guidone) writes:
>
>
>The Canadian Red Cross Society Headquarters amateur radio station
>(VA3CRC) is using a Ten Tec Paragon, Ser # 585-00055. We are also
>running
>an AL-80 amplifier. The antenna is a TH 7 DXX at 100 feet. The
>distance
>from the rig to the antenna is approximately 200 feet.
>
>We have been experiencing what appears to be rf feedback. We have
>been
>told that our audio sounds like a 2 meter FM radio that is off
>frequency.
>All of these symptoms appear to be intermittent. When keying the
>mike or
>using vox there is a small amount of noise in the headset even with
>the
>monitor level as low as the pot will allow. After a few seconds of
>talk
>there is a small popping sound. We have tried alternate
>grounding
>methods to no avail, processor in/out, mic gain up/down, vox
>gain/antivox.
>Today we spent several hours ensuring that all connectors, screws and
>ICs
>were tight. We thought we had the problem solved when we
>disconnected the
>speaker lead. By the time we were finished we had it re-connected and
> the
>problem had disspeared, but only temporarily. Our latest guess is
>that
>there is a problem in the monitor circuit.
>
>Anyone have any clues that might help solve our problem.
>
>Thanks in advance
>
>73
>
>Ric (for VA3CRC)
>
>Hi Ric,
Hope this isn't too basic. One, did you try a different mike. I had a
problem with a Kenwood mike that was cured when I went to a Heil. Also, i
put a bunch of ferrite beads on the mike lead. No more Rf feedback that
was giving me microphonics.
73 de gerry K1NY
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