[Elecraft] MD2 mic pinout (was: K3 audio output v headphone sensitiviy)

[Don Wilhelm]

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.
>