[Elecraft] Meaning of KAT500 flashing Auto light

[Phil Wheeler]

Don,

By "latest firmware" do you mean latest released 
firmware or beta?  I ask because I may have seen 
that phenomenon, too, but have not been able to 
repeat it on a reliable basis.

73, Phil w7ox

On 5/20/14, 7:11 AM, Don Wilhelm wrote:
> 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.
>>
>