hi

was hoping that someone might be able to share some advice

rig MVField mic stock vs Heil w/heil cable (goldline 5)

when i tx there is a slight but clearly noticable humm like a 60cycle
sounds a little like the buzz of a transformer my tube stereo would do
that if i touched a speaker wire w/o gnd


here is what i observed:

if i unscrew the mic plug at rig and pull it out a little so the mic
metal connector dosn't touch the rig (leaving enough for pins to
contact) humm goes away

if i use the stock mic or another yaesu mic no humm not a drop

if i use my astron to power the rig instead of it's built in supply the
humm goes away

both the rig and the mic etc are all kind of new moving the heil cable
or mic location hum is same


i tried removing and adding ground wires to the chassy gnd screw no
change (thou my coax shields are grounded )


my guess is the rig and it's connections are 'ok' since the stock
mic's don't have any problems

so guessing the problem is isolated between the heil cable/mic but i
dunno somthing is not right and i know it's prob simple

what is the likely cauze of the hum? whats the best test and or fix??




any help is appreciated