[Elecraft] KXAT3 Internal Antenna Tuner Question

[Matthew Zilmer]

Don, I have a related question.  

A lot of my HF operations are Navy-Marine Corps MARS.  All of our allocated frequencies are outside the ham bands, and many are not even close to a band edge.  How does the K3 remember ATU settings outside the bands, or does it even have logic to support this?  I generally run the ATU when tuning to another MARS frequency far outside the bands.

Yes, I have the KBPF3 gen purpose filter, and everything is working fine outside the ham bands.

Thanks,
Matt Zilmer, W6NIA

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Tuesday, February 05, 2013 3:16 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KXAT3 Internal Antenna Tuner Question

I forgot to add - when initiallly setting up the band segments - continue the TUNE cycles until you reach the top of the band.
After that, all is automatic when you return to that band segment.

73,
Don W3FPR

On 2/5/2013 6:12 PM, Don Wilhelm wrote:
> Fred,
>
> The KXAT3 does remember the setting on each band segment.  I cannot 
> recall the width of the band segments, but I suggest you do a TUNE on 
> the bottom of each band, then move up 20 kHz and do a TUNE again.
> When you go back to that same band segment, the tuning combination 
> should be recalled automatically with no additional operations on your 
> part.
> If you do a TUNE again (at that point in time) the KXAT3 will initiate 
> a new tune cycle and throw away the previously remembered values.  In 
> other words, do not do an additional TUNE unless you change antennas.
>
> 73,
> Don W3FPR
>
> On 2/5/2013 5:32 PM, Fred Carvalho wrote:
>> Is there any documentation on ATU which explains how it stores 
>> antenna matching parameters in its memory, if it ever does ?
>> It seems to me that after actioning on the ATU and getting a good 
>> match on a given frequency, when I get back to it again, after tuning 
>> on some other bands, using the same antenna, it losts the antenna 
>> info and needs to be re-tuned. Is it how it works ?
>>
>> Thanks Fred
>>
>
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