[Elecraft] KPA100 problems

Sat Jan 17 12:23:00 2004

You guys should look in the K2 Manual in the trouble shooting section (page 
7, Appendix E for Rev E manual) under "Transmitter (150-199)" and look at 
code "160  Power Output fluctuates." The "fix" indicated there does work to 
stop this fluctuation.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
At 11:25 AM 1/17/04, Carl Strode wrote:
>David,
>
>My K2 #3777 exhibits the same problem.  It is not a "problem" in most 
>cases since a change of few watts has virtually no impact at the receiving end.
>
>HOWEVER, it is a real problem when I use the K2/100 to drive an amp.  I 
>find it very difficult to properly tune my SB-1000 linear when the output 
>from the execiter (K2) is bouncing up and down.
>
>Properly loading the grounded grid 3-500Z amp requires it to be fully 
>loaded, so a random step change in exciter output from 35 to 40 to 37 to 
>42 etc. makes tuning a genuine pain.
>
>Otherwise my KPA 100 is perfect in all respects.
>
>Yes, it certainly would be nice to kill this bug.
>
>Carl
>WA7CS
>
>David Clark wrote:
>
>>   I  built a KPA100 and aligned it but I am having problems with it. 
>> When I key down and watch the output with a wattmeter the power changes 
>> up and down about 10 watts twice a second until I unkey. I have double 
>> checked all component locations and they are correct. I have emailed 
>> elecraft support and have not got much help. I have tryed realigning R26 
>> and R27 but it made no difference. I also double checked the bias 
>> current. Ant suggestions???
>>David Clark
>>KD7NZK
>>K2: 2778
>>
>>
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