It was answered a week or so ago ... I haven't looked through the
archives but the comment was that the KPA-500 has gained "AH-4
compatibility."  My interpretation of that comment from TPTB was that
the "AH-4 jack" has the Icom "key" and "start" signals on tip and ring
(or ring and tip) ... and the KPA-500 will react to the Icom commands
just like the AH-3/AH-4.

73,

    ... Joe, W4TV


On 3/29/2012 7:50 PM, Doug Faunt N6TQS +1-510-655-8604 wrote:
>
>> What is the AH4 1/8inch jack for?
>>
> This question hasn't been answered.  I have a guess, but ....
>
> 73, doug
>
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