Quantar Misbehaving

[Renamon]

So, I have a Quantar that is misbehaving.

No PL/DPL or P25: Machine is just fine!

PL: There is a very noticeable hum. When I turn down the PL/DPL/Slow Speed data adjustment, it does nothing to the hum. Eventually, the subscriber radios will no longer un-mute since they cannot hear a PL (that is when the modulation adjustment is around 4-5%, down from the default 17%). The hum is really bad when the signal is marginal.

DPL: The subscriber radios will not un-mute at all when the machine is using a DPL. This is with the modulation adjustment at the default 17%. Even when I turn the modulation up high enough that you can hear the DPL rumble, it still will not un-mute the radios. The subscriber radios work just fine with other DPL machines.

Just tuned it a couple weeks ago, and everything looked great! I have no idea where to start, and any ideas would be greatly appreciated.

-Jake

[Astro Spectra]

I would start with doing a transmit modulation alignment. Discussions:

http://communications.support/threads/1 ... -P-25-help


http://communications.support/threads/6 ... #post48013

[Renamon]

That is what it was. Put it on the scope - the lines were so wavy that at first I thought I was in the wrong mode since it just looked like one line, not a higher and a lower one!

Works like a champ now.