[Elecraft] [K2] K2/100 RF power indication not working - Blown D16 & D17?

[Don Wilhelm]

Bill,

Yes, as long as the KPA100 is physically connected to the base K2, its 
wattmeter will be used for power control.  The base K2 provides power to 
the critical circuits and MCU in the KPA100 even though the PA is turned 
off in the menu or not powered via the APP connector.

You MUST connect the antenna/dummy load to the KPA100 SO-239 ANT jack - 
you cannot use the base K2 BNC ANT jack unless you physically remove and 
disconnect the KPA100.  If you try, the base K2 will think there is no 
power being produced and will increase drive to maximum - as high as 19 
watts uncontrolled power output will result no matter where you set the 
power control.

73,
Don W3FPR

On 5/26/2019 2:56 PM, Bill Coleman wrote:
> So, if you turn the KPA100 off via the menu, the KPA100 SWR bridge is still used in any case?
>
> I’ll plan to add 50-100 kOhm resistors across the output, as you suggested. I’m also going to re-do the calibration of both SWR meters, just make sure no damage was done to the KAT100.
>
>> On May 25, 2019, at 1:52 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:
>>
>> I only partially answered the question about when each wattmeter is used.
>> If the KAT100 is connected to a QRP K2 (KPA100 physically removed) through a KIO2, then the KAT100 wattmeter will be used for power control and SWR display in the K2 display.
>>
>> As long as the KPA100 is physically connected, its wattmeter is used for power control and also display of SWR on the K2.
>>
>> 73,
>> Don W3FPR
>>
>>