[App_rpt-users] Random Keyup & Hum

[Steve Agee]

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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