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Our club repeater also ended up interfering with the local tower.
It seems that the transmitter PLL was unstable, and "hopping" between that frequency, and ours. We were clearly audible in their recordings. Lest any "experts" step in and claim that you can't receive FM on an AM receiver, I'd ask them to consider what effect the passband filter of the AM receiver's IF might have on the FM signal as it deviates from side to side.... I hit the magic codes and took the repeater down, once we determined that this was indeed the source. A re-tweak of the transmit PLL, and a stub filter cut to pass 146.730 and reject the tower frequency, cured the problem, and insured that if it ever happens again, they probably won't hear us. The tower now has our phone numbers in their books, in case there is ever another problem. The tower complimented our rapid and assertive handling of the problem in their closing letter to the FCC. Repeater cans don't do much for signals that are far out of band. |
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