[Elecraft] KX1 #01221 Alive but shy of stated power?

Jeremy Cowgar jeremy at cowgar.com
Thu Aug 4 12:06:29 EDT 2005


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>>WHAT are the changes to R11 and R30???? Everyone is referring to them, but
>>no-one has said what they are!!
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I was reading past posts about the KX1 and stumbled across this post:

http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-11/msg01045.html

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*To*: 	Elecraft at mailman.qth.net <mailto:Elecraft%40mailman.qth.net>
*Subject*: 	Re: [Elecraft] KX1 Power Measurements by band
*From*: 	DYARNES at aol.com <mailto:DYARNES%40aol.com>
*Date*: 	Sat, 29 Nov 2003 09:12:05 EST

Add me to the list of those experiencing low power output.  I was getting 
under 2 watts on 40, and just over 2 watts on 30 and 20.  Gary suggested I 
increase R30 to 27 ohms and decrease R11 to between 3.3 ohms and 5.6 ohms 
(after 
first suggesting I check the toroids, etc.).  I made the above changes and my 
power out went to about 2.5 on 40, and just over 3 watts on 30 and 20.  I had 
been behind in monitoring the reflector, and now I see the other comments about 
low power.  I had gathered from my exchanges with Gary that I wasn't the only 
one with this problem.  So, I guess I will dig back in and up the value for R30 
a bit more.  Thanks to the NorCal resistor kit, I have a nice supply.  Then, 
hopefully, squeezing the turns on L2 will be necessary (it wasn't before 
obviously).  My guess is, though, that I still won't get to the power levels 
that 
Ron and Phil are reporting.  We'll see.

I am also noticing the lack of audio output that others mentioned, although 
on 40 it seems pretty good.  It's just on 30 and 20 that it seems a little 
"light".  But the RX doesn't seem to miss much sensitivity wise.  Pretty darn 
good 
RX design I'd say.  Everything else seems to be working like a charm!

Dave W7AQK




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