[App_rpt-users] Random Keyup & Hum

[Mark Johnston]

Checked the rxsquelch - goes from 500~ to 950 - I take it thats the cause
for now changed the tx PL to 100 and put the rx PL back to 123 so far so
good -
some reason can't reach node 2560 anymore (no response at all, not even a
failed to connect
- yet I can connect to other nodes. The odd thing is, if there is so much
de-sense my receive works fine decoding DTMF
even when the signal I get from the repeater is S1-3 I can't imagine it
being de-sensed,
that bad but not sure what to say, repeater runs 80W out of the duplexer
444.450
have to get up to the site sometime and check... Just testing from my HT
where I get into a spot that the repeater is
virtually impossible to hear and it hears my signal on Low just fine - I
don't know how it would be de-sense but hard to say.

Was reading this
http://www.repeater-builder.com/astron/astron-intro-stuff.html
makes the think twice about my astron 50A supply -

Thanks for the ideas...

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On Thu, Jan 29, 2015 at 10:16 AM, Steve Agee <n5zua at earthlink.net> wrote:

>  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:
> ADCKS*CLI> radio tune rxsquelch
> 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.
>
> N5ZUA
>
>
> On 1/29/2015 11:54 AM, Mark Johnston wrote:
>
>   Does anyone know what might cause this, (attached audio file)
>
>  I was having this on my node, using a GE Mastr II with URI and DSP to
> decode the PL tone
> 123.0 - my first thought was feedback loop from the TX but it just happens
> without anyone keying up or an ID occurring.
>
>  However also considered someone jamming / txing a near dead carrier with
> a hum on their signal.
>
>  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).
>
>  Changed the PL lower in freq and it all cleared up. Not sure what could
> have caused it though?
> 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.
>
>  If anyone has a thought other then some station keying up to cause this,
> jamming etc... what else could happen to do that?
>
>
>  73's
>
>  Mark KC7DMF
>
>
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