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The easy way to eliminate de-sense (talking to itself) would be to
turn off the encoded/TX CTCSS, and see if it still happens. Also,
log in to the CLI and run:<br>
ADCKS*CLI> radio tune rxsquelch<br>
both with and without the transmitter keyed, and observe your
average RSSI values. If higher when keyed, then you have identified
a de-sense issue, and need more isolation between TX & RX.<br>
<br>
N5ZUA<br>
<br>
<div class="moz-cite-prefix">On 1/29/2015 11:54 AM, Mark Johnston
wrote:<br>
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<div style="font-size:12.8000001907349px">Does anyone know
what might cause this, (attached audio file)</div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">I was having
this on my node, using a GE Mastr II with URI and DSP to
decode the PL tone</div>
<div style="font-size:12.8000001907349px">123.0 - my first
thought was feedback loop from the TX but it just
happens without anyone keying up or an ID occurring. </div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">However also
considered someone jamming / txing a near dead carrier
with a hum on their signal. </div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">Tried reboot,
and this would happen whether I was connected or not, it
also has the courtesy tone, which is the local tone, as
if it was a station here (local).</div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">Changed the PL
lower in freq and it all cleared up. Not sure what could
have caused it though?</div>
<div style="font-size:12.8000001907349px">As far as I know
nothing has changed at the repeater site, haven't been
up there in ~ 2 months since the last change where I
raised the antenna, from 10 to 30' and brought it about
15' closer to the repeater. </div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">If anyone has a
thought other then some station keying up to cause this,
jamming etc... what else could happen to do that?</div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">73's</div>
<div style="font-size:12.8000001907349px"><br>
</div>
<div style="font-size:12.8000001907349px">Mark KC7DMF</div>
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