[Elecraft] KX1 hi current on 80 and power mod.

[pa3gyu]

Guys,

Thanks for all the responses
Frederick wrote:
>    RE:  High current on 80.  I had a similar problem when I built my 
> KX1.  Do a search on KL7CW and see my post of April 19th
>on the Elecraft site.
In the meantime I had decided to take the KX1 out of the housing and fiddle 
a bit with the LPF and the 3080 board. I have no idea what I did to fix it 
(there were definately no shorts!) but it worked... The waveform went to a 
straight sine and current draw normalized. Thanks for your response though 
- it makes me feel better to know I'm not the only one who encountered 
this. Your description sounds very similar to what I had here.

Aftwerwards, I did the Power Output Mod.

So..... in response to the HAM asking whether all bugs are worked out of 
the 3080-module, I'd say: sort of. Most never run into this 
high-power-on-80m situation and those that do are able to fix it with a bit 
of wiggling ;-)

I can savely say however that the KXB3080 and the Power Output Modification 
were the most challenging of the Elecraft experiences I have had. But I've 
only built one K2 (with options) and one KX1 (with options) so far. End 
result: all gear up and running, even the high-power-on-80 situation didn't 
last more than a day.

And for those who are still curious about the KX1's output power:
Power Supply 13,8 V:
3.8 W @ 80m, 850 mA
2.9 W @ 40m, 680 mA
4 W @ 30m, 620 mA
2 W @ 20m, 450 mA

I don't know whether these are typical values, but hey, they're mine.....


Bart de PA3GYU