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

[Coote, Jay]

Jeremy and List;
(See below)
My guess on power variations would be:
1.  Core/winding variations in the RF PA output inductors and capacitors
2.  Variations in the DDS lowpass filter inductors/caps
3.  Variations in freq response of Q4, Q5 or Q6
4.  Bad Q6

Jay
W6CJ
-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jeremy Cowgar
Sent: Thursday, August 04, 2005 8:20 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX1 #01221 Alive but shy of stated power?

Why the difference, they are all the same rig why would it change from
rig to rig?

Jeremy
KB8LFA

Coote, Jay wrote:

>Jeremy and List;
>Your KX-1 turned out better than mine.  My 10 MHz band is weak and 
>noisy on receive plus I had the following transmitter problems:
>I had 4 watts/7MHz and 10 MHz,  2.6 watts/14 MHz at 13.8V;   1.4
>watts/7MHz and 0.8 watts/14 MHz at 9.0V.
>I've tried the changes in R11 and R30 to increase power output, however

>this just increases power and does nothing for my 14 MHz power
roll-off.
>Mine obviously does not meet spec and it is good to have suggestions on

>what to try next from Elecraft.  I've heard of people getting 4 watts 
>or more, nearly flat across all three bands.  That power rise on 14 MHz

>at 9V does sound odd... I would have guessed it to be around 1 watt.  
>Is your power supply at 9V delivering enough current or is there a 
>voltage
>drop- possibly preventing a relay from opening/closing and changing the

>specs of the RF filters on the PA?... A guess.
>  
>