This may have been addressed earlier, and if so I apologize. A GE Mobile Mastr
II will generate an oscillation in the audio output stage if it is not loaded
at all times. I don't remember the beginning of this thread, but if you are
using a GE Mobile radio, this will wind up transmitting a tone on the repeated
signal.
I go one step further than putting a load on the speaker leads (10 Ohms) - I
place a small teflon sleeve over the pin to the mother board that supplies B+
to the audio output stage after desense tests are completed. This removes B+
from the audio amp, and the sleeve can be removed if the audio output needs to
be activated for later tests.
73 - Jim W5ZIT
--- On Tue, 11/10/09, W3ML <w...@arrl.net> wrote:
From: W3ML <w...@arrl.net>
Subject: [Repeater-Builder] Re: repeater problems solved
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, November 10, 2009, 4:19 PM
Thanks,
I will check that. It is funny that out of the guys that hear it most are using
mobile rigs. But, then the other night they said hey it is gone. Then ten
minutes later it is back.
All I know is with the fixes I was given by a great bunch of hams on here and
the GE site and the with the new antenna and coax the repeater works like it is
suppose to and sounds great to me.
Of course, I am losing my hearing so I don't hear the tone.
Thanks and 73
John
--- In Repeater-Builder@ yahoogroups. com, wd8chl <wd8...@...> wrote:
>
> W3ML wrote:
> > If it is not the grounded negative terminal I will just put in high pass
> > filter on the PL cable. That should help reduce it or remove it.
> >
> > Thanks all.
> >
> > 73
> > John
> >
>
> I wouldn't do that. FIRST-unplug the encoder audio out lead and see if
> it's still there (maybe the voltage in lead too, then ground). Then
> check levels. It should be between 500 and 800 Hz deviation. Then look
> for a good clean sine wave. Com-Spec SS-32's and TS-32's are known to
> have a less than perfect sine wave and can sound a bit raspy sometimes.
> If all that is OK, the problem is on the receiving end.
>
