[Elecraft] Microphone Resistor

[W3FPR - Don Wilhelm]

Jeff,

Let me offer one more option.

Put a 1.2k resistor in parallel with the 5.6k when (and only when) the mic 
containing the preamp and HC5 is plugged in.

Here is how to do that easily:  Solder the 5.6k resistor on the mic jack 
between pins 1 and 6 as instructed for the MD2,  then solder a 1.2k resistor 
on the mic jack between pins 1 and 5.  IMPORTANT - remove any connection at 
the mic header on pin 5 (FUNC is not used).  Now, inside your mic plug for 
the HC5/preamp mic, place a jumper between pins 5 and 6.

When you plug in the Elecraft mic (any stock Elecraft mic), you have the 
proper 5.6k resistor in the 5 volt line.  When you plug in the mic having 
the jumper installed, the 1.2k resistor is placed in parallel (through the 
jumper) with the 5.6k resulting in a resistance of 988 ohms which is likely 
close enough to 1k (use 1.3k instead of the 1.2k and the result will be 1055 
ohms if you prefer that value).

73,
Don W3FPR

----- Original Message ----- 

> My new MD2 microphone should arrive tomorrow, and I am trying to decide 
> what
> to do about the resistor between pin 6 and pin 1. I have a hand microphone
> with a Heil HC-4 and a N0MF pre-amp in it that I want to continue to use. 
> It
> has a 1k resistor between pin 1 and pin 6 in per the instructions for the
> pre-amp.
>
>
>
> It seams I have three options. ...