Posted by
Michael Madden-3 on
Aug 19, 2006; 10:03am
URL: http://elecraft.85.s1.nabble.com/KX1-ATU-is-resetting-from-TUN-to-CAL-by-itself-tp393134.html
Hi group,
I have the same problem K3ESE below had with the KX1
ATU. Same conditions, 12V external, 4-5W, good SWR
match, start sending CW, hear the ATU grind a little,
and then the SWR goes to 5.0 or 9.9. Then another
tune and it does not grind, but tells me it is back to
1.0.
I did a little digging and found that when it goes
into this bad state, the ATU mode has gone from TUN to
CAL on its own. When I do the 2nd tune to get it out,
all that is happening is that it is resetting from CAL
back to TUN.
I see this with a 28' wire in a tree with two 16' and
one 24' counterpoise. When it tunes, it tunes to 1.0
on 30M and 20M and about 1.5 on 40M. Then on all
bands, after I send CW for a few characters, I hear
this clicking and the SWR jumps to a high number and
the power out goes down. Then double-check the ATU
state, and sure enough, it has been reset from TUN to
CAL. Basically, the high SWR problem is only because
it is bypassing the ATU and giving me whatever the
random wire shows.
I can reproduce this on a dummy load. However, the
SWR does not jump up, because the dummy load has 1.0
to begin with, even when it automatically moves itself
from TUN to CAL on its own. But I hear the same
clicking happen when I start to send CW, and I can
verify that it is resetting to CAL mode.
When I turn the KX1 off in this funny state, and turn
it back on, it has not remembered the last frequency I
was on and starts at a different frequency.
Was there ever a cause/fix to this problem ever found?
It makes having a QSO really difficult when the SWR
keeps jumping back and forth.
Thanks and 73,
Mike N9OHW
----- (original problem statement) -----
Lately, there have been a bunch of times when I
power my KX1 with a 12V supply, activate the tuner to
get a match, and the result is 4-5W and a good match.
Then, while operating, or just while it's sitting, not
being operated, I'll sometimes hear a few relays
chatter for a split second, and the match seems to
have been lost. When I transmit, I see that the power
out is down to 2W or so. I need to activate TUN again,
which will restore the match and the higher power out.
Where can I look for the answer to this one...?
thanks,
LL/K3ESE
K1#379,KX1#11,K2#4442(in the works)
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