I have a very similar setup.  K3 -> KPA500 -> MFJ 994BRT 600W autotuner
mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m
doublet.

It works fantastic on 80-20, but will not tune better than about 2:1 on
17.  I cannot use the KPA500 on 17 because the SWR is too high.  Nothing
I've tried works.  I'm wondering if it is simply the tuning
range/resolution of the MFJ-994BRT?  I like the idea of remote mounting, as
I have only a couple feet of coax between the tuner and the balun, thus
minimizing SWR-related feedline loss.

Any suggestions for how to get it to tune on 17?

73
Chris - K1AY
Punta Gorda, FL


On Mon, Feb 12, 2018 at 12:16 PM, John W2XS <jm...@optonline.net> wrote:

> I replaced my Johnson Matchbox with a Balun Designs tuner balun. The
> biggest
> benefit is that the K3 ATU remembers the settings from band to band so the
> QSY is very rapid. I love watching the DX spots come rolling through on my
> N3FJP logging program and clicking on them to QSY to that frequency and not
> have to tune up again. I use it on 80 through 6 meters with an 80m doublet
> fed with KW ladder line (300 ohm).
>
> My recommendation is to keep the piece of coax from the balun to the rig as
> short as possible.  This is to minimize loss since that line will most
> likely be highly mis-matched on most bands. There was a QST article not
> that
> long ago which detailed the losses in that situation and I was surprised at
> how high they were.
>
> I once had an MFJ balanced RF Ammeter and made measurements of the JMB vs.
> the balun and they compared favorably.  DJ0IP (referenced earlier) has
> kindly put those measurements on his website. (This is in the FWIW
> category!)
>
> I have not tried to substitute the tuner balun with another type but that
> might be a future experiment.
>
> 73, John W2XS
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to challi...@gmail.com
>



-- 
Life is like Linux - it never stands still.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Reply via email to