[Elecraft] Re: KPA 100 pA issues,,,, puzzle...

[Bill NY9H]

876 Khz......

and scott has the part on it's way...

tnx Don....


bill


At 06:21 PM 10/10/2007, you wrote:
>Bill,
>
>Those symptoms sound familiar.  I believe your KPA100 is oscillating 
>at about 600 kHz.
>
>During the KPA100UPKT installation, did you change C31?  There is an 
>omission in the kit contents and the instructions right now which is 
>trying to be corrected, but has not yet been completed.
>
>If you did not change C31 to a 0.22 uf capacitor, send a note to 
>parts at elecraft.com and ask for one - the part number is E530295.
>
>Installation of the larger value for C31 will stop an oscillation at 
>about 600 kHz (what frequency does the LP100 say is being transmitted).
>Note for others following this thread - the C31 change is *only* to 
>be installed if the KPA100UPKT has been installed.
>
>73,
>Don W3FPR
>
>Bill NY9H wrote:
>>initial symptom was the autotuner would lock up/ & reset the radio
>>when tuning ...only on 40 , so I ordered the PA upgrade kit...
>>
>>when running the k2 @ qrp .. the swr reads correct and the PA is 
>>basically out of the circuit,.,,,,"1.3"  ....  this is on 40. both 
>>on the set AND THE LP-100
>>
>>now my LP100 is giving me a big clue what is going bad in my K2/100 PA.....
>>The problem is that I still don't understand enough of the basics../..
>>but when i dial up over 15 watts  the swr reads 9.98  !!!  but when 
>>i go back to under 15 watts .... the swr reads correctly...(LP-100)
>>
>>I know something is wacky in the kpa100....  and i thought it was 
>>in the tuner...
>>
>>I have just completed the last of the upgrades to the KPA , but it 
>>appears to not have helped...
>>
>>oN TYHE k2/100 the swr seems to read double when on the  PA  vs the 
>>qrp,....on the other bands , but 40 has bigger /*issues...such as 
>>locking up the autotuner... .which was the original sympton...