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Impedance mismatch affecting sideband?
While I solved one problem on SSB, another continues.
I am still having that "carrier" problem on SSB. For some reason, as soon as I speak into the mic, the radio holds power, as if it were on AM. The TX meter on the radio shows this, and the SWR/power meter shows this. The power is not fluctuating with modulation. The ALC was not cranked up. The power is not high, about 20 watts peak. Like I said, it seems to do this as soon as I speak into the mic. Even a subtle noise will send it to max, and stay there. Changed mics, and have the same problem. So then I tried this. I took this radio and put it in my car (it's my only radio). When I connect it directly to the Wilson 1000 barefoot, I get the same problem on SSB. However, when I go thru the amp, it works perfectly, no power unless I modulate. This is also true if the amp is turned on or off. It appears to be an impedance mismatch. Since the amp input is a perfect match, the problem goes away, whether or not the amp power is on or off. Here is the kicker. The SWR on my home antenna is about 1.3-1.5 across the band. Any suggestions? Vinnie S. |
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