[Elecraft] KAT3 and Six Meters ...

[WILLIS COOKE]

I don't know it is your problem or not, but I found that I have a 2/1 SWR on 6 
meters with no tuner when my amp relay is in line, but near 1/1 if I connect the 
coax around the amp.  For diagnosis purposes if you are having unexplained 
results it is a good idea to temporarily remove as many relays, switches, 
connectors and the like from the antenna feed and see if the trouble persists.  
Try connecting to a dummy load or maybe a non 50 ohm dummy load if you have one 
and see if you still have the problem.  Anything in the circuit can cause 
trouble, not just antennas and tuners.
 Willis 'Cookie' Cooke 
K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart 




________________________________
From: Jim Sheldon <w0eb at cox.net>
To: Rich - K1HTV <k1htv at comcast.net>; Elecraft Reflector 
<elecraft at mailman.qth.net>
Sent: Sun, May 29, 2011 10:03:31 AM
Subject: Re: [Elecraft] KAT3 and Six Meters ...

Rich and Joe,
I HAVE noticed the same problem on other bands as well.  Specifically, 160 
meters, 15 meters and 10 meters as well as now on 6.  I don't notice it all the 
time on 6 and I thought it stoped when I put the ferrites on the antenna cables, 
but it cropped up again this morning on 6.  Later it reared it's head on 15.  


I have not noticed it on any of the other bands, but it may be related to a 
particular segment of the band 

and I may not have actually transmitted or run the tuner on that segment yet.  

My antennas are resonant on the bands they are used for with the exception of 
the inverted L which is resonant about 1850 on 160 and used with the tuner for 
the lower end of 160 and on 80.  


The problem does not seem to occur on 80 and on any other band but 160 with the 
L.  The ATU will find a 1:1 match on all bands using the L and doesn't exhibit 
the tuning anomaly on anything but 160 with that antenna.

That said, a second (sometimes it takes 3) touch of the ATU Tune button usually 
causes it to tune for a much longer period of time but it tends to find a match 
closer to 1:0.  This is particularly annoying in a contest on 160.  On 6, the 3 
element yagi is resonant at 50.100 and I normally don't use the tuner, but I 
started experimenting with it after this problem was reported and I discovered 
that my K3 exhibits the same anomaly that Rich and Joe reported.

Jim Sheldon - W0EB
> Joe,
> You are not alone.  I've noticed the same problem here with my K3's
> ATU. With
> the ATU in BYPASS the SWR is low on my 6M yagi. When I turn the ATU
> on and press
> the tune button, the K3 finds a dip, but when I transmit, the SWR
> is much higher
> than with the ATU turned on. Pressing the tune button a 2nd or 3rd
> time makes do
> difference.
>
> As you reported, this does not happen on any of the other HF bands.
>
> 73,
> Rich - K1HTV
>
> = = =
>
> ----Original Message-----
> From: Joe Subich, W4TV [mailto:lists at subich.com]
> Sent: Friday, May 27, 2011 11:42 AM
> To: Elecraft Reflector
> Subject: [Elecraft] KAT3 and Six Meters ...
>
>
> I'm seeing a strange behavior with the KAT3 on six.
>
> If I engage the tuner it finds a low SWR and stops tuning.
> However, if I then close the Key the K3 shows "HI SWR" and folds
> back.  This
> happens even on the dummy load (1.15:1).
> It does not happen on any other band.
>
> Suggestions?
>
> 73,
>
> ... Joe, W4TV

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html