The KPA100 is dedicated to the K2.  It needs to communicate with the K2 
MCU to select the proper band, control the power output level as well as 
a myriad of other functions.

While it could feasibly be modified, it would be a considerable task to 
do so, and would require adding new firmware with more smarts than 
available in the existing KPA100 firmware IC.

73,
Don W3FPR

On 6/11/2012 12:44 PM, hawley, charles j jr wrote:
> Why do folks say only with K2? Can't it be modified?
>
> Sent from my iPad
>
> On Jun 11, 2012, at 10:59 AM, "Ariel Jacala"<[email protected]>  wrote:
>
>> Steve
>>
>> HFPacker version 4 gets you 35 watts out - this is a kit and will work with 
>> any QRP rig - cost is 259 USD
>>
>> KPA100 is internal to the K2/100 (essentially a new top) - check the 
>> Elecraft price list - will only work with a K2 - this is what I have.
>>
>> Juma PA100 is a very nice 100 watt linear for about 460 Euros and will work 
>> with any rig
>>
>> Or you can wait for the KXPA100 which will work with any QRP rig
>>
>>
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