[Elecraft] K2/100, half power output on 17-10M

[David Wilburn]

Ok, where do we find out more about this?  I just finished inventory and 
my C31 is a .033uF.

David Wilburn
dave.wilburn at verizon.net
K4DGW
K2 #5982


Don Wilhelm wrote:
> Jeff,
> 
> In that case, what is the size of C31?  If it is the old .033 uF it must 
> be changed to the new .22 uF value.  You can get one from Elecraft when 
> they get back in the office, but if you have two .1 uF caps with a 
> voltage rating of 50 volts or more, you can parallel them for the time 
> being.
> 
> 73,
> Don W3FPR
> 
> Jeff Kinzli N6GQ wrote:
>> Don, thanks, it's the newest KPA100, just bought/built it about a
>> month or two ago...
>>
>> -Jeff
>>
>> On 4/7/07, Don Wilhelm <w3fpr at earthlink.net> wrote:
>>> Jeff,
>>>
>>> Before we give any answer, we need to know the level of the KPA100.
>>> Did you build it from the manual Revision D or the earlier Rev C?
>>> Another way of checking - do you have a toroid at L15 and is RFC10 
>>> present?
>>>
>>> It is not likely to be a sticking relay problem - that almost never
>>> happens with the KPA100.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> Jeff Kinzli N6GQ wrote:
>>> > My K2/100 (#5945) has been working well lately, until I started
>>> > noticing higher output at times, more pronounced with higher SWR
>>> > antennas (i.e. it would more often spike it's output power if
>>> > connected to an antenna with more than 1.3:1 SWR, the output power
>>> > would rise to 140W).
>>> >
>>> > About the same time, I started noticing lower output power on 10, 12,
>>> > 15, and 17M. Output remains full on 20, 30, 40 and 80M.
>>> >
>>> > Today I pulled the KPA100 apart, went though and checked and
>>> > resoldered everything around the SWR bridge, and anything that looked
>>> > remotely cold-soldered.
>>> >
>>> > Put it back together, same issue (well, at least the lower power 
>>> issue).
>>> >
>>> > With a setting of anything over 50W, the max output is 50-52W, as
>>> > indicated on the K2 internal wattmeter, or my external wattmeter.
>>> >
>>> > Any ideas why I'd only get half power on half the bands (and this is a
>>> > new occurrance, I was getting full power before).
>>> >
>>> > Thanks for any ideas,
>>> >
>>> > Jeff
>>>
>>
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