CB Bleedover

[Ed in Tx]

Might be RF going back down the feedline getting into the house electrical system and maybe the speaker wires to that stereo which would explain why you are hearing your transmission while it's off. From your description and what I see looks like an old Antron A99 CB antenna. I have one I used on 10M that the fiberglass is shedding badly too. (I need to do something about that.) One thing that I did that helped keep RF off the feedline and getting back into the radio, was coiling up about 10 turns of coax just below the antenna feed point to make a common mode choke balun, but I also remember doing other things including the optional radial kit for that antenna before I mostly eliminated the problem. The coiled up cable forming a choke balun was the most effective in my situation.

[MIPS]

Originally Posted by Ed in Tx

I have one I used on 10M that the fiberglass is shedding badly too. (I need to do something about that.)

I found that while wearing gloves you could rub down the poles quickly to get rid of the loose fiberglass and then spray it all with clear coat or paint. Likely won't last forever because the antenna sways a bit but it at least seals it again.

[Ed in Tx]

My A99 has been out in the sun and elements since 1994 so it's pretty ragged. I've watched birds picking the fiberglass strands off of it to use for their nest building!

Might start with about 6-10 turns about 6" dia air core, just below the ant coax connector, form the coil around something like PVC pipe, try that.

Might try unplugging that stereo from the wall to see if that changes anything. If so maybe add some ferrite cores to the speaker leads right where they hook the amp-receiver. Check that they aren't some resonant length at or near 27 mHz wavelength that might be inducing RF into the stereo. 8 1/2 ft, (103 inches) is 1/4 wave, twice that, 17 ft, is 1/2 wave etc. You need to avoid resonant wire lengths.

I was getting into my next-door neighbor's sub-woofer, like wide-open hum and noise coming in blasts from my SSB transmissions. Worked on that a while. Finally, took an old ferrite core I had saved from from a flyback transformer, wound the audio coax from his AVR to the sub-woofer through it several turns, and that killed the RF getting into it completely. Took all day to figure that one out. Good luck!