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Audiovox Wired FM Modulator Whines
Just installed my second Audiovox FMM100A wired FM modulator. The first
one had a high-frequency "whine" (like a carrier tone, but audible) even with no audio source feeding the box and with the car engine shut off. It's like taking a hearing test at the doctor's office with very high-pitched tones. Audiovox tech support said that shouldn't happen (the most dangerous words in technology: "it *should* work" followed closely by "that shouldn't happen") and advised me to return it. The second unit performs identically. It's not that I'm overly sensitive to high freqs; the rest of my family hears it, too. I've tried relocating the ground, feeding power from a separate battery, wrapping the loose wires separately, enclosing the whole package in foil and connecting that to ground with a capacitor to intercept stray RF, etc. The whine isn't as audible while driving, but it's loud enough to be annoying even with the car radio treble turned down a bit. Otherwise it works like a charm: when switched on, it routes the audio through the car speakers on one of two FM frequencies even if there's a strong station on that freq. Anyone else have this problem? And/or a fix? |
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