[Elecraft] Probable KXAT1 Problem

[Phil Wheeler]

When building the atu, it passed all checks.  I even went through all 
the Troubleshooting steps on page 11 of the manual.  So all seemed OK.  
And I thought all was good, since it loaded the antenna I was using 
well. BUT -- that antenna is pretty much 1.0:1 where I operate, so I 
suspect that led to a false sense of success.

Now I am trying the rig with a variety of wires and balanced antennas 
and I am coming to suspect that the atu is not working correctly.

Consider three cases (from among many):

Antenna A (beam): MFJ analyzer says it is 2.0:1 on 14050

Antenna B (D4 multiband dipole): MFJ says 1.2:1

Dummy load:  1.0:1

Scenario is as follows:

1.  I connect Antenna A and push Tune.  Relays clatter away and 
eventually stop.  Indication is r2.2

2.  I connect either Antenna B or the dummy load: Relays do nothing. 
Indication is r1.0

3.  I reconnect Anenna A.  More clattering and r2.2 results.

Then I read the L and C using the ATU menu.  I get L.00 and C.00

I would expect very different behavior and result.  r should indicate 
the swr after tuning, not that of the untuned antenna.  And L, C of 00 
does not look right when loading an antenna with an inherent swr of 2:1 
or so.

It is basically as though the atu, while making the dutiful noises, is 
not matching the antenna.  BTW -- band does not matter; I just chose 20 
m for this data set.

Now I know why my initial attempts to load a 24 ft wire a few days ago 
were so odd.  I think the atu is not doing what it is supposed to.

Since I have done all the troubleshooting steps with the expected 
results re C and L readings, relay switching and so on, adjusted R1 and 
R2 according to the manual, etc. -- where should I look for this problem?

Thanks in advance!

73, Phil




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