M0FMT wrote:
Hi LF
I think the issue is intermodulation products caused by over driving
the the linear RF stages of the TX into distortion because when Jim
reduces drive the sidebands petty well disappear at this range.
Hello All,
This doesn't explain why Jim also RECEIVES multiple spots from strong
stations with similar amplitudes and 50/100Hz spacings.
Applying Occam's Razor - look initially for one cause - rather than "on
transmit there's a TX IMD or PSU hum problem and on RX there's another
separate 50Hz problem"
There's a 50Hz modulation problem somewhere, but it's most likely a
common RX/TX part of the system.
Speclab and a known, clean RX system are your friends....
Simplify.... Simplify....
John
GM4LSV
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