[Elecraft] K3 antenna tuner question

[Poul Erik Karlshøj (PKA)]

I don't think the problem is due to good tunes being misses by antenna being "hit", because when it happens, it is very reproductive, i.e. you can repeat the ATU tuning and it will always come back to the non-optimum LC combination.
Paul
OZ4UN

-----Oprindelig meddelelse-----
Fra: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] På vegne af David Cutter
Sendt: 26. maj 2011 14:54
Til: drewko; Elecraft at mailman.qth.net
Emne: Re: [Elecraft] K3 antenna tuner question

On 'problem' frequencies, re-doing the tune soon after the first try has always brought a better swr for me, but I have no wires amongst branches which I think means you may be getting hit and miss good tunes.

David
G3UNA

>A quick way to find the best LC combinations manually is to tune them  
>for maximum receiver noise. You can refine this further by using the  
>K3's AFV meter to measure the noise level of the different promising  
>LC combinations.
> >
> A reminder abou auto tuning-- if you hit ATU TUNE a second time within 
> a few seconds of the first tuning operation it is supposed to find a 
> better match. However, I have noticed that the second tune sometimes 
> gives a worse SWR than the first one. (May be due to the variable 
> nature of my antenna-- bare wire through tree branches...)
>
> 73,
> Drew
> AF2Z
>
>
> On Thu, 26 May 2011 07:31:53 -0200, you wrote:
>
>>Another thing about the K3 ATU is, that it sometimes stops at an LC 
>>combination which is NOT identical to the LC combination giving the 
>>lowest SWR. If that happens you can manually change the L or C to 
>>obtain the lowest SWR - but it is a bit cumbersome - and not what you 
>>expect from an automatic tuner. I only have this problem when it is 
>>raining (antennas are partially hidden in trees and use 450 ohm open 
>>feeder and 4:1 baluns in the shack)
>>73 de OZ4UN
>> 

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