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- Mar 28, 2009
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I have an issue on 20 meters. I'm hoping the brain trust here can help me figure something out. I'll try to lay out the facts and see what you all think.
When operating on 20 meters SSB my radio will slowly begin to mute itself. In other words, if the noise is a S3 it will slowly work it's way down to S1. When I key the mic the receive level comes back up.
Now here are the confusing facts...
a)it only happens with my tri-band yagi. It is a trap antenna, the Cushcraft A4S with 40meter add on.
b) it only happens on 20 meters
c)if I key the mic into a different antenna it does not bring up the receive level
d)If I key the mic on a different band into the same antenna it does not bring up the receive level
ETA I have eliminated all pieces of equipment except for the radio, the antenna, a stretch of coax and a DX engineering balun. I have a few ideas but I want to see what you all come up with.
When operating on 20 meters SSB my radio will slowly begin to mute itself. In other words, if the noise is a S3 it will slowly work it's way down to S1. When I key the mic the receive level comes back up.
Now here are the confusing facts...
a)it only happens with my tri-band yagi. It is a trap antenna, the Cushcraft A4S with 40meter add on.
b) it only happens on 20 meters
c)if I key the mic into a different antenna it does not bring up the receive level
d)If I key the mic on a different band into the same antenna it does not bring up the receive level
ETA I have eliminated all pieces of equipment except for the radio, the antenna, a stretch of coax and a DX engineering balun. I have a few ideas but I want to see what you all come up with.
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