[Elecraft] KAT500 - Tuning Anomoly

[Tom]

Hi,
When you use the antenna analyzer very little power is used.  When you tune, 
much more power is used.
I have a 160m antenna and never have an issue if I run below 100W.  The 
minute it gets to 110, I have the same issues as you.
I suggest turning down the tune power as a test. You can find this in the 
menus for the K3 under TUN PWR.
73 Tom
va2fsq.com

-----Original Message----- 
From: Bill Wiehe via Elecraft
Sent: Sunday, October 30, 2016 3:20 PM
To: Elecraft Reflector
Subject: [Elecraft] KAT500 - Tuning Anomoly

Up until last week, my KAT500 has run lawlessly. However, it now has a 
problem tuning my 160M dipole for no obvious reason. Symptoms are continuous 
searching for a match. If it finds a match in tune mode,  as soon as you hit 
the key,  it begins tuning again in "Auto" mode or faults in "MAN" mode, 
regardless of power level.   What is interesting is that the KAT500 will 
tune my OCF Windom on 160M with no problem. Initially assuming it was the 
antenna at fault, I did the follow checks.
- Checked the 160M dipole with an Antenna Analyzer and both it and the coax 
check out fine. Even where the analyzer    suggests a 1:1 match, the KAT500 
tries to retune. - Switched input ports on the back of the KAT500. No 
change.
- Used the K3 ATU (with KAT500 in bypass mode and with the dipole directly 
connected to the K3) and it matches the   160M  dipole antenna with no 
trouble. - Erased all the previous 160M tune memories, no change.- Reset 
factory defaults, no change.- Reloaded the firmware from the website, no 
change.
I would appreciate insight one my have.Thanks & 73 Bill - W0BBI



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