[Elecraft] K3 low Power

[Martin]

Don,
no i didn't install the jumper block. I'm  not even sure if i still have it.

I transmitted only for very short periods touching all 3 transistors. I 
felt only one of them getting warm.

So i need to find the jumper block first before i proceed the testing.

Thank you for the reply.


Am 13.05.2014 01:28, schrieb Don Wilhelm:
> Martin,
>
> I have to ask since you did not mention it -- did you install the PA
> jumper block after removing the KPA3?  If not, you need to do that.
>
> As for operating the transistors in the Low Power PA getting warm - one
> should *never* operate the K3 in transmit with that bottom cover
> removed.  The cover serves as a heat sink.  Hopefully you have not
> already destroyed those transistors.
>
> 73,
> Don W3FPR
>
> On 5/12/2014 5:53 PM, Martin wrote:
>> Elecrafters,
>> a little while ago i had an issue with loss of rf-power.
>> I thought i had found the problem. I hadn't.
>>
>> Symptom now:
>> Power out only about 3 Watts.
>>
>> I removed the 100W-PA, changed the Menue to 'not inst'.
>>
>> With TUN PWR set to 12W i can achieve about 2.5W .
>>
>> Only 1 of the 3 Transistors on the low-Power PA gets warm during
>> (short) transmissions with the bottom cover removed.
>>
>> There are 2 RD15HVF1 and 1 RD06HHF1. How can i check if a transistor
>> is defective?
>>
>
>

-- 

Ohne CW ist es nur CB..

73, Martin DM4iM