[Elecraft] KX1 still Low Power

Fri Nov 28 21:22:00 2003

I just did my initial testing and am getting a bit less out than I would 
like using a dummy load and a very accurate digital qrp wattmeter (don't 
recall the name of the kit I built it from).

Using 13.8 V supply, I'm getting 2.6 W on 20 m and 3.5 W on 40 m.  The 
40 m number is OK, but I would expect more than 3 W on 20 m.  Since this 
is not grossly off, I doubt if it relates to toroids or anything like 
that, unless turn spacing would make for small changes.  And R4 is Full 
CW (I know because I started with the other full CW -- need to 
understand clocks better -- and had zero power out).

Looks like it is time for the "33 ohm solution" :-)

Since I don't have anything near that at hand (should have bought one on 
the way back from my impromptu doctor visit), I will start building the 
options tonight and do the resistor change tomorrow.

Very happy with RX performance, by the way.  Seems hot and the filter 
can really get pretty sharp.  Plus really easy to tune in 20 m SSB 
stations and the like.

73, Phil

Ron D'Eau Claire wrote:

>All of my testing was done at 13.8 v for just the reasons Phil mentions. 
>
>If you've checked your turns on the toroids R4 is FULL CW and solder joints
>are good, then I'd suggest raising the value of the 22 ohm resistor. You
>don't need a precision resistor in that spot - just something close to 33
>ohms should do it.
>
>Ron AC7AC
>
>-----Original Message-----
>Alan,
>
>I know the manual specs say "12 V supply".  But often that means a 13.8 
>VDC shack supply, not 12 V or 12.6 V.  However, that power (2.0 W at 
>12.6 V) does sound low for the rig when they say 2 W with a 9 V supply.  
>Have you tried with a 13.8 V supply and if so what are the results?
>
>I'm behind you (just abt to do intitial TX tests but had to see the 
>doctor on an unplanned basis).  But I will do all initial tests with 
>13.8 VDC -- since I am bypassing the internal battery assy for now.
>
>73, Phil
>
>Alan WB6ZQZ wrote:
>
>  
>
>>Just completed the 30 meter upgrade to the KX1. The power out at
>>12.6vdc is still low. 2 watts on 7 and 14 and about 2.5 on 10.
>>
>>Is changing the 22 ohm resistor to 33 ohms the next thing to try?
>>
>>
>>    
>>
>
>
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