This is the Network Access Code otherwise known as the NAC which is the equivalent of PL / DPL in the Astro Mode. There is one other parameter you should determine and set up for the Digital Astro Mode. There's a parameter for PL and Carrier Squelch which is the "AND SQUELCH" function which is normally set up for 20 dB Quieting plus the proper PL Code. If you've Enabled PL / DPL Detect only then the only time the receiver should open is with the proper PL code. The way you've had your VHF Quantar programmed sounds like it was in the Carrier Squelch Mode for both Analog and Astro (Digital) signaling. I know this is a vague description but maybe someone has run across some goofy quirk or whatever. One thing I did today in the programming is set the repeat hold in and repeat enable to PL/DPL only, hoping that whatever this interference might be does not have the proper PL.
I'm 99% sure it's interference, but assuming it's not is there anything that could be causing it within the unit, perhaps the way it's programmed, etc? Previously I had tightened the squelch up some but the noise returned yesterday pretty badly. My problem is, as with many interference problems, by the time I get out to the site it has usually quit, or at least it is so sporadic that it does it for a second or two but quits before I can react to it. Usually it will only make this noise for a second or two after the field unit drops off, but on a couple of ocassions it has done it almost nonstop for quite a while. It won't get into the repeater until one of the units has keyed it up and then drops off. It isn't clear, but rather pretty obnoxious sounding.
Anywho, soon after installing the repeater they started to hear noise that sounds similar to data. Plans are for digital mobiles to be installed soon, but none are in so far. Few months back we installed a Quantar VHF repeater programmed for mixed mode (Analog/Astro CAI) operation for the local SO.
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