[Elecraft] Heil Proset Plus and K3

[Don Wilhelm]

Steve,

The subject of electret mic bias has come up before, and your statements 
below are incorrect --

Please look at the microphone connector in the manual (page 13), and 
interpret the designation for pin 6 literally.  It is *not* marked 
"bias", it is designated "+8 V (10 ma max)".
"Bias" is what is applied to the microphone element - and that is 
accomplished by adding a DC voltage onto the AF line - pin 1.  That is 
quite different than a raw source of +8V.

The Heil Kenwood adapter has no connection to either pins 5 or 6.  The 
Heil Kenwood adapter connects the mic element to pin 1, and the K3 
applies bias to pin 1 if the menu is set correctly.

73,
Don W3FPR

n4lq wrote:
> Wow. It would be interesting to know how that managed to work. The IC 
> means the headset is wired for ICOM then with a Kenwood adapter to an 
> Elecraft mic. jack with the bias on the wrong pin. (8) instead of (5) 
> as etc.
> I'm glad it works but not sure why.
>
> Steve Ellington
>