[Elecraft] Strong Rd feedback in mh3

[Edouard Lafargue]

I was operating portable today, with a long wire in a tree  and
counterpoise on the ground, and no matter what I did, every time I pushed
the mic button, I got super strong RF feedback in audio monitoring,
apparently picked up by the MH3 cable - things got slightly better if I
tried to bunch/coil the MH3 cable. Is this common?

I only managed to work one station in Indiana in the time I tried, most of
the time what I heard in my headphones while transmitting was
unintelligible garble, so it is no surprise others didn't hear me, I
guess...

My KX3 has got an internal ATU and it managed to match the long wire
perfectly at each frequency I tried to operate...

Any advice?

Ed
W6ELA

(phone)