[Elecraft] Meaning of KAT500 flashing Auto light

[Don Wilhelm]

Andy,

There have been improvements in the firmware to address exactly that 
re-tuning problem.  It has to do with the measurement of SWR - during 
SSB, if the reflected power is sampled at a voice peak and the forward 
power is sampled during a period of low RF, the resulting calculation 
will think the SWR is high and re-tune.  There have been changes made to 
the firmware to attempt to smooth that measurement over a longer period 
of time.

If you are not using the latest firmware, give it a try.

After 'training' the tuner, you may want to run it in Manual mode rather 
than letting it auto-tune 'on the fly'.

73,
Don W3FPR

On 5/20/2014 8:44 AM, ANDY NEHAN wrote:
> I am having some problems with my understanding of the KAT500.
>
> I have a K3 and an ACOM1000 linear. On 40m when I operate data modes or AM (purely for testing purposes) all is well the units work well together. I can happily run up to 400 watts and as is well. My 40m OCFD has an SWR of about 1.2:1.
>
> But when I operate SSB things go "odd". For no apparent reason the KAT500 starts to retune part way through and over and enters a fault condition (on the same frequency as I was using for data - so there is no frequency change involved) and the Auto button flashes. Now I have looked in the manual and cant find the meaning of the flashing Auto LED.
>
>