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
On 12/30/11 3:57 PM, Wayne Burdick wrote:
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.
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