There could be a number of reasons. You are going to have to be a little more specific as Poping a really vague term. If possible try recording it and post it as a .WAV or .MP3.
This could be anything from a loose wire to desence caused by the oscillators in the controller. My research says: "I've seen that crap before...." +10V mic bias coming from the exciter down the audio path into the controller and not playing nice with the half VCC biased amplifiers. This can also be a problem in the long run as a +10 volt biased line on the output will charge the AC coupling capcitors backwards which are between 6 and 7 volts on their positive side and cause them to fail. I've even had the capacitors stop passing audio, wait for me to get to the site, open the equipement, and blow up, right in my face... Mike Rowe would be proud... Anyway, electrolytic or any other polarized capacitors do not belong in an AC path where DC bias can occur. If this is your problem there are a number of solutions. One would be to put a non-polar capacitor in series with your TX audio path or replace the polarized capcitors in the controller with non-polar ceramics. I personally would recommend eliminating the bias supply resistor from the MASTR-II exciter, I think it was a 620 or 680 ohm resistor. But this may not be your problem... On 2/20/07, Ken Sanders <[EMAIL PROTECTED]> wrote: > Hi All, > > I'm pretty inexperienced but find myself in charge of a nice repeater > operation, 145.170 - N6FRG in Angels Camp, CA. This is a GE Mastr II > mobil unit that has been in service for many, many years. We just > replaced the 1980s era SC-1 controller with an Arcom RC210 and have a > poping noise when repeating but not during the voice announcements. Any > suggestions for a cure will be appreciated. > > 73, Ken Sanders - AE6LA > > > > > > > Yahoo! Groups Links > > > >
