K3 tx power troubles

[Martin Sole-3]

My aging K3, S/N 298, is once again proving a little troublesome. Into a
nice solid 50 ohm dummy load with a strong 14 volt supply and short
thick cables never known to be an issue I see a maximum of about 10
watts out when set to 110 watts on the front panel. Starting at 0w it
increases in line with the setting until about 3.5 watts. The LPA stops
there and then when the KPA3 comes in it goes up to about 10 watts but
beyond that no further increase.

I presume this is a either a drive or and LPA issue but I suspect the
actual cause might be well known here. What are the chances?


Regards
Martin, HS0ZED


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[Martin Sole-3]

Hi Bill,

I have the K3 working again, currently going great stuff on 10m to give
it a good workout. Problem was one of those silly ones but also one that
I have just recently read about on the reflector, the case of a loose
TMP coax. In my case it turned out to be J7 on the KREF3 board.

Martin, HS0ZED




On 3/6/63 00:42, William Hammond wrote:

> https://ftp.elecraft.com/K3/Manuals%20Downloads/E740182%20KPA3CONMDKT%20Instruction%20Manual.pdf 
> <https://ftp.elecraft.com/K3/Manuals Downloads/E740182 KPA3CONMDKT
> Instruction Manual.pdf>
>
> This describes the process...
>
> The parts needed are described on the first page of the document...
>
> 73, Bill-AK5X
>
>> On Jun 2, 2020, at 10:17 AM, Martin Sole <[hidden email]
>> <mailto:[hidden email]>> wrote:
>>
>> My aging K3, S/N 298, is once again proving a little troublesome.
>> Into a nice solid 50 ohm dummy load with a strong 14 volt supply and
>> short thick cables never known to be an issue I see a maximum of
>> about 10 watts out when set to 110 watts on the front panel. Starting
>> at 0w it increases in line with the setting until about 3.5 watts.
>> The LPA stops there and then when the KPA3 comes in it goes up to
>> about 10 watts but beyond that no further increase.
>>
>> I presume this is a either a drive or and LPA issue but I suspect the
>> actual cause might be well known here. What are the chances?
>>
>>
>> Regards
>> Martin, HS0ZED
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email] <mailto:[hidden email]>
>

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