[Elecraft] KLAT500 Getting tired?

[Dave New, N8SBE]

If you have the AUX cable connected to the radio, so that it gets 
frequency/band info, then try to turn off the frequency counter feature 
in the KAT500:

FDT Frequency Counter Distance for Retune GET format: FDT;
SET/RESPONSE format: FDT nn;

where nn is the distance, in kHz, between the current ATU frequency and 
the most recent TX frequency count for the ATU to change ATU settings to 
the new frequency. The value is between 0 (interpreted as the default of 
10 kHz) thru 65535, which disables ATU tuning based on frequency count. 
This is intended for customers that prefer the KAT500 only follow the 
frequency provided by a serial port command or the K3/K3S/K4 AUXBUS, or 
select a minimum distance between current ATU frequency and a newly 
counted frequency. FDT was introduced in firmware version 01.99.

So, using the KAT500 utility, send a FDT 65535;
and see if that helps.  I did this a week or so ago, because I kept 
having re-tunes on 40 and in particular 80 meters.  So far, it seems to 
have calmed the tuner down a bit.  Of course, YMMV.

Hope that helps.

73,

-- Dave, N8SBE, Hamshack Hotline 550-0971, HamsOverIP 101018, 
AmateurWire 1348

On 2025-07-16 13:47, AJ8MH Radio via Elecraft wrote:
> "When ants are conn to the radio's ATU, the tune is normal..."
> 
> Could this be a hint? Have you replaced any jumpers between the radio 
> and tuner?  Do you have any antenna switches in that jumper line? What 
> are the exact symptoms of your problem?
> 
> 
> On 7/16/2025 12:40 PM, dave ingebright via Elecraft wrote: