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CW Noise upon switching from transmit to receive
My setup is a 6600M + PGXL into a vertical antenna. I run CW mostly with BW set to about 150Hz, AGC set to medium and RF gain set to 0dB. I adjust the agc to just start squelching background noise. Only one slice is operating.
Recently, in contests on 20m I have been experiencing a loud blast of noise that starts when the radio switches from transmit to receive and fades away after 1-2 seconds. The noise sounds exactly like a nearby powerful station overloading the receiver, except it occurs with no stations closer than about 3-5 KHz.
After the 1-2 second recovery period the noise is gone and the receiver performs normally even though the loud nearby stations are still transmitting.
I am not sure but the noise does not seem to appear on the waterfall under my receiving frequency so, it is not a spurious signal generated by some other station. I think it is generated inside the receiver.
It is not intermittent, it occurs on every transmit-to-receive transition but, does not occur when no other stations are on the band.
Is there some setup that I can change to eliminate this problem?
Jim Charlton AD0AB
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