[Elecraft] K3 ATU

[Brett Howard]

This functionality has been in the radio since firmware release 3.03 on
March 17th of 2009.  

Essentially the radio keeps memories of the ATU settings.  The spacing
of these "memories" are different depending on what band you're in...

160 - every 10kc
80 through 12 - every 20kc
10 - 50kc
6 - 200kc

So in spacings of those whenever you tune your antenna the radio will
look for a new value.  If it finds something new that value is written
into a memory for that segment of the band.  So then if you QSY from one
band segment to another as soon as you TX the radio will recall your
previous tune settings automatically.  The blinking of the ATU icon
simply tells you that you just loaded a new set of L-C parameters into
the ATU.

These settings are stored per band and per antenna.  Keep in mind that
not only are the memories stored that way but the state of the ATU is
stored that way.  So if you have a resonant antenna on a specific band
and a specific antenna port you can have the radio disable the ATU there
and it will remember that.  However if its not resonant the K3 will
remember its tuning across that band and keep things at a low SWR even
on very fairly high Q antennas.

~Brett (N7MG)  (Previously KC7OTG)

On Sun, 2010-05-30 at 07:10 +0000, Barry Simpson wrote:
> The ATU has started to behave strangely since I upgraded to the latest
> firmware.
> 
>  
> 
> Most times when I start keying after a QSY, there is the click of a relay
> then the ATU icon goes off momentarily and then returns.
> 
>  
> 
> Anyone else experiencing this issue ?
> 
>  
> 
> Barry  VK2BJ
> 
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