One other comment, I had severe rf in my audio problems when I got my 590,
that radio seems more suceptable than most. I had to put in a couple of
those line isolaters and that solved the problem, I can dig up the link if
anyone wants it. There were some other fixes with those microphones,
running a wire down the center of the cord from base of microphone to
ground on the radio as I recall. That might have b een the 50, but those
microphones have been known to have r f i problems as well. As mentioned
above, I went from a 2000 with no r f i at all to the 590 and had severe
r f i which the coax isolators fixed.
73
Butch
WA0VJR
Node 3148
Wallace, ks.