Hi Graham,
Thank you for the speedy reply. My Neighbor and I have tried all sorts
of AGC settings to no avail as far as the hum is concerned.
If we turn off the tone the hum goes away and audio is fine. My repeater
sends out 127.3 at about 350 Hz level for PL most receivers of course
strip it off
so you don't hear it.
If we go to simplex on 6 FM and use the tone the hum is there, turn off
the tone and hum is gone. Playing with AGC settings has
not even reduced the hum as long as a tone is present.
My humble thought is the low end needs to be filtered out then all will
be well.
Ted W3VG
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