Re: [Elecraft] KX3 mic wiring info

2011-12-30 Thread 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



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Re: [Elecraft] KX3 mic wiring info

2011-12-30 Thread Wayne Burdick
Mike Schwendeman wrote:

 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).

My bad


 -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!

At your service

73,
Wayne
N6KR


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