[Elecraft] KX3 mic wiring info

[Mike Schwendeman]

To answer your later email to me (Time sent was 4:27 PM, my local time); 
Yes, I just now am viewing the "diagram," Wayne.

Earlier in the "original post" (Thu, 29 Dec 2011 08:22:53 -0800), I 
believe you had mentioned:

"However, the mic jack can also be used with mics having a 3-circuit
(stereo) plug. These will not provide PTT or UP/DN controls, but can
still be used with VOX or the XMIT switch (equivalent to PTT)."

-Which I had understood to be that the 3-circuit (stereo) plug "...will 
not provide PTT..." function.  (-In other words, per the clip above, a 
3-circuit plug would be DENIED functional access to the desired PTT 
function.)  Well, this latest information does not seem to reflect this 
same point!  -And this is very welcome news!  (Thank you!)

Bottom line:  Call off the dogs!  The 3-circuit plug appears to indeed 
be permitted the coveted PTT function!  Ya-HOOO!

73, and I again thank you for your very patient clarification.  Now, 
START MAKING THEM RADIOS!!!  It looks like you have an extremely fine 
product!

-Mike-
KØJTA


On 12/30/11 3:57 PM, Wayne Burdick wrote:
> Mike,
>
> Here's how the mic is wired:
>
>   Sleeve = shield ground
>   ring2 = logic ground
>   ring1 = PTT/UP/DN
>   tip = mic audio
>
> Since a 3-circuit plug merges sleeve and ring2, a mic with such a plug 
> could be wired to work with the KX3 and provide PTT, though I don't 
> have one with which to test this idea.
>
> On the ring1 line, resistance to ground determines the function:
>
>   PTT:  0 ohms
>   DN:   4.7 k
>   UP:   10 k
>
> We may invoke another function with the combination of UP+DN (3.2 k). 
> We could call this a "meta" operation that changes what UP/DN do. For 
> example, their function could switch to band, RIT, or volume up/down.
>
> Let me know if your target mic will work with the above wiring as-is, 
> or if a simple mod is required, and we'll add it to our KX3 FAQ.
>
> 73,
> Wayne
> N6KR
>
>
>