[Elecraft] atu effect on low power out of kxv60 (was xv144alignment )

[Don Brown]

Hi

Yes I ran into this about a year ago. The problem is the KAT2 does not have 
a three state output driver for the RF detector as the KPA100 and KAT100 
have and the KAT2 is loading the RF detect line. Changing R6 on the KAT2 to 
a higher value will solve the problem. I used 470 ohms rather than the 47 
ohm resistor normally installed.

Don Brown

KD5NDB




----- Original Message ----- 
From: "michael jensen" <mj at the-jensen-dk.net>
To: <elecraft at mailman.qth.net>
Sent: Sunday, February 26, 2006 11:57 AM
Subject: [Elecraft] atu effect on low power out of kxv60 (was 
xv144alignment )


When i installed the kxv60  i did not have the atu installed. After a broken 
diode every thing tested ok.  atu was installed. And tested ok. I did not 
recheck the kxv60.   when pressing tune to tx while aligning power on xv144 
i saw that the power from k2 could only reach something like 0.2 mW.  i 
mentioned it here and got some help.  now i did an other test on kxv60 
having taken the lid of k2 every thing worked ok 1mW was send when pressing 
tune. I put the k2 together  and started the xv144 alignment. Now the 
problem was back. I have now found that pressing tune with the atu installed 
result in only 0.2 mW on the low power out.
removing the atu control cable from the control board the low power out are 
now 1mW pressing tune.  i do not have a power meter able to measure that 
level, but i belive having the atu installed makes the low power output to 
be about 1/5 using tune to tx. Seems that low power out are ok when keying 
the k2  with the mic and with the atu installed. Only  measurement  i could 
do was to to check the output from the transverter. I aligned the   xv144 
using the k2 with out the atu.  so 1 mW displayed on the display giving 20W 
on the  xv144. Installing the atu in k2 pressing tune give 6w from the 
xv144. Now keying with mic shouting the south european olaaa drive  xv144 to 
20w.  any word on this please
thanks in advance
OZ1BZJ

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