Baffling radio interference
I have a 2001 Ford F350 crew cab, long box pickup, with a Triton V10 engine, which we picked up in October. We love our new-to-us truck, but we have an issue with the radio. We live in a rural area, ...
Forum Discussion
Wes Tausend wrote:
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Ahhh.
Each radio has a circuit called AGC for Automatic Gain Control. AGC allows close and/or distant stations to wend their way through the RF and audio amplification stages without creating an overload (too loud, distorted etc.).
It is done by a sort of variable "throttle" feedback process (think bootstrap or cruise control) and some circuit designs become unstable at the max gain levels needed for weak stations; i.e. overly distant stations. The highly leveraged circuit then starts to "motorboat", a slow audible "putt-putt" oscillation. That may be it. Just slightly higher truck voltage during increased rpm can vary this discharge frequency in a reverse way.
1.Hasta luego (see you later)
2.Adiós (good bye)
3.Hasta mañana (see you tomorrow)
4.Hasta pronto (see you soon)
5.Hasta la próxima (until next time), :B
Wes
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Thanks, Wes! I was willing to live with the noise, once I figured out my radio wasn't "on the fritz." But I can't stand a baffling problem with no logical explanation. Yours makes perfect sense! Thanks.
Tom
