--- In [email protected], Ken Arck <[EMAIL PROTECTED]> wrote: > > Have a customer with the following issue: > > Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio > xmtr site. > > Issue: Very low level audio of radio station appears on Mastr II's > xmtr (yes, external controller). Repeater owner hasn't fully > explained what "very low level" means. But regardless..... > > Question: The only way I see this happening is due to some AM > component on radio station's transmitter. > > Thoughts? > > Ken
A couple related cases: I had a problem with a 15kW FM station getting into the baseband of a nearby analog microwave radio. You could hear distorted peaks of the broadcast station audio low on the baseband. Removing all feed lines from the site entry plate one at a time revealed a "noisy" (but otherwise working) N elbow adapter on another radio. I recall a problem from another site where nearby mobiles on ch X would open up satellite receiver X plus several others on different channels. All these receivers had the same crystal clear audio from the mobile unit as if it were transmitting on all channels at once. This one turned out to be a bad preamp in a preselector shelf. My point would be that these types of problems with near-field RF mixing in who-knows-what can be and often are just about anything. Good luck! (You can always TRY liberal grounding and shielding.) James K7ICU
