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

[Don Wilhelm]

Dave,

FB that your C31 is .033 uF - but that alone is not an indicator. Do you 
  also have a toroid at L16 AND no RFC10 as well (and blue toroid cores 
at L15 and RFC1)?  All these things must go together.  The prior design 
KPA100 with RFC10 and L16 installed did properly use a .033 uF capacitor 
at C31.

If you have no toroid at L16 and no RFC10, then request a .22 uF 
capacitor for C31 from Elecraft.

If you do have an L16 toroid and RFC10 installed, the proper value for 
C31 is .033 uF.

73,
Don W3FPR

David Wilburn wrote:
> 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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>