[Elecraft] K2 Finals - Chronic Blow-Outs

[Don Wilhelm]

Ray,

There is one more thing to check.  Use an external wattmeter and a dummy 
load - check to be certain the actual output power is somewhere near 
what the K2 indicates on the display during a TUNE.

If the displayed power is nowhere close to the actual power, then you 
need to fix the power measuring circuit - for the base K2, that is D9, 
R66, R67, R68, R69 and C77.  If you have the KAT2 or the KPA100 or 
KAT100, then the wattmeter in those options may not be working correctly.

One other thing I might mention - are you operating the K2 into a high 
SWR load?  If so, the voltages in the PA stage may be excessively high 
causing failure of the finals.

73,
Don W3FPR

On 10/13/2012 9:08 AM, w7asa wrote:
> Man!  You guys are really encouraging-and FAST!
>
> The K2 has ONLY the SSB option at this time. I am building the ATU, 160,
> 60m, and a few more goodies on my bench as we speak.
>
> ---
>>>> I bought this on the internet very recently and have basicaly no
>>>> information available from the seller. When I ordered the ATU kit from
>>>> Elecraft, I also ordered two K2PAKIT packs just in case, *figuring that
>>>> I would never need them*
> I installed all K2PAKIT components, including Q11 & Q13, and the 1.5 Ohm
> resistor R50. My bench has a grounded ESD mat and wrist strap and I've made
> a career working to IPC610/620 and mil electronics standards. So, I am
> really comfortable inside of this radio.
>
>