[Elecraft] [Elecraft_K3] K3, CM-500 oddity, a follow up

[Don Wilhelm]

Greg posted these two links on 03/04/12.  Other than that they are right 
angle plugs, I know nothing about them.

http://www.pchcables.com/hogmrian2mas.html

http://www.pchcables.com/3foan2stmato.html

73,
Don W3FPR

On 3/9/2012 10:30 AM, Eugene Balinski wrote:
> I am sure that someone has mentioned this before however,
> has someone located a good source of matching plugs for the
> mic and headphone jack on the KX3?   I would like to order
> some in advance and start some projects.
>
> 73
>
> Gene K1NR
> KX3 S/N TBD   : -)
>
>
>
>
>
> On Thu, 08 Mar 2012 21:15:06 -0500
>   Don Wilhelm<w3fpr at embarqmail.com>  wrote:
>> For those who do not understand the technicalities, I
>> would suggest that
>> the CM-500 cannot be plugged directly into the KX3 jack.
>>   The KX3 PTT is
>> on the ring connection, and the stock CM-500 connects the
>> Tip and ring
>> together for the AF connection.
>>
>> It MAY work, but it is not a certainty, the KX3 function
>> of the ring
>> contact is three-fold - PTT, UP and DWN.
>> the audio level on the ring may or may not induce one of
>> those functions
>> depending on the voltage and current.
>>
>> It would be better to create a homebrew adapter that
>> would accept the
>> CM-500 AF on the tip and ring, and connect that only to
>> the tip of the
>> KX3 jack, and at the same time add a small box with a
>> pushbutton for PTT
>> and also pushbuttons (with the appropriate resistors) for
>> UP and DWN).
>>
>> In other words, the stock CM-500 *may* work, but it may
>> not depending on
>> the levels presented at the ring connection.
>>
>> This situation may also be present in microphone designed
>> primarily  for
>> computer use - they may be OK, but if they create funny
>> PTT or UP or DWN
>> conditions, blame it on the connection between tip and
>> ring on the
>> microphone jack.
>>
>> 73,
>> Don W3FPR
>>
>> On 3/8/2012 3:46 PM, Joe Subich, W4TV wrote:
>>>> As for the CM-500, I'd like to know if it is the tip,
>> or ring, on the
>>>> 1/8 inch plug that is the actual mic audio lead. I
>> will have to try
>>>> one, or the other, to see.
>>> The answer is quite simple ... the tip and ring of the
>> CM-500 mic plug
>>> are connected together.
>>>
>>> The supplied battery box has no connection to the ring
>> of the mic
>>> (3.5mm jack).  Tip of the jack is connected to tip and
>> ring of the
>>> 3.5mm plug via a 1 uF capacitor.  The positive side of
>> the battery
>>> (+3.0V) is connected to the tip of the 3.5mm jack with
>> a 2.2K Ohm
>>> resistor.  The negative side of the battery is
>> connected to sleeve
>>> (common/ground) of both plug and jack (input/output).
>>>
>>> 73,
>>>
>>>       ... Joe, W4TV
>>>
>>>
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