I've had similar problems - my Acom 2000A would shut down on an Arc fault on
160 when I had the receive antenna (K7TJR 4 Sq) pointed towards the xmit
antenna (100' vertical inv-L) that is about 300' away. Only when pointed at
it... but then I discovered (the 160 antenna JUST went up on 26Dec09- first
time ever on 160) it did this in any direction on 80 (the 4 sq had been working
fine prior to installing the inv-L).
So I made a simple little relay box that connects off the xmit ptt line to the
amp - it turns power off to the receive 4 sq - this solved my problem... for
you a similar design just disconnecting (and if you want to go so far
connecting the RX input to a 50 ohm resistor) the RX antenna line would
probably work fine.
g.
Gary K9RX
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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