John,
I disassembled the mic plug on my MD2. Here is the wiring by color
(warning, it may be different on yours if Heil used a different cable,
one never knows).
Pin 1 - AF - White
Pin 2 - PTT - Red
Pin 7 - AF Return (gnd) - shield and black wires
Pin 8 - PTT Return (gnd) - Blue.
If you have the dongle for the 1/4 inch footswitch jack, it connects
with its red wire to pin 2 and its white wire to pin 8.
There is no need for any separate 8 volt line (pins 3, 4, 5 and 6 are
not connected). For the K3, set the mic bias on in the menu - on a K2
the 5600 ohm resistor on the back of the K2 mic jack between pins 1 and
6 takes care of the bias - of course the K2 mic configuration header
should be wired with all pins straight across.
73,
Don W3FPR
John Clare wrote:
Hi Brian and all. I have an old pair of Kenwood HS5 headphones and
plugged them in to my factory assembled K3 after donning them. Had to
back the AF gain back by about 10% for comfortable listening. I have a
question that someone out there with an Elecraft/Heil MD2 mic may be
able to help with. I bought it second hand and the previous owner had
re-wired to suit Icom. I now wish to use it on my K3 and would like to
get the wire color code or find out which color wire the +8v goes to.
I e-mailed Heil but they can't or won't tell me. Can any one with an
MD2 give me the pin outs by color pllease? John Cl;are VK1CJ.
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