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#6
February 15th 05, 04:11 PM
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"Vinnie S." wrote in message ... On Tue, 15 Feb 2005 10:06:20 -0500, Dave Hall wrote: Well, I of the 2 problems is solved. The cutting out on SSB after 3 seconds is solved. The Astron took care of that. But 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 power is not high, about 20 watts peak. Seem the previous owner had it turned down. 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. I am going t try this in the car and see what I get. This is a common problem. In many cases, if you remove the cover the problem will go away. The final stage is going into oscillation and the "carrier" you see is that oscillation. Usually (and unfortunately) the oscillation falls in the 29 Mhz area. Sometimes this problem is caused by added mods that people add to try to squeeze a few more watts out of it. There are added capacitors on the bottom side of the board that can cause this. If you see an extra cap (or two in parallel) on the underside of the board connected to the final, remove it and that should cure your problem. You nailed it on the head. Cover off, oscillation gone. Now I have to isolate it. Vinnie S. Rebias the output. |
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