To add to the discussion, I have had a lot of trouble keying the SB-220
with several TEN-TEC rigs that use a CPU. That rather high voltage DC
relay creates a big spike when the contacts open which can lock up the
CPU. My solution has been an external transistor interface. I believe I
got the info from the Rich Measures web site. Rich has helped many a ham
tame an unruly amplifier.
73
Jerry K8JRO
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