Why not ground the antenna and feed it as a Unipole? Most AM BC
stations are doing that these days. They also use a remote tuner,
although it is usually a fixed network as they only use one frequency.
That way the reflected power on the line is nil.
73
Bob, K4TAX
On 2/13/2018 12:29 PM, Chris Hallinan wrote:
I have been using MFJ tuners outside (MFJ-927) on a 43' vertical in
southwest Florida for many years. The only complaint I have is that they
don't get along with thunderstorms. I've probably gone through half dozen
of these over the years. However, it's worth it to me because when they
work, they work well. Outside in Florida sun and summer rains and salt air
is probably one of the most hostile environments for any electronics. And
I don't protect them in any way so I'm amazed they work as long as they
do. The only mod I make is to replace the ground lug with stainless steel
hardware.
When there is a threat of lightning, I ground the antenna (I have a large
wing nut for that) and disconnect the tuner. If I forget, I might have to
buy a new one ;)
I love the idea of remote tuners - avoids the losses associated with coax
and high SWR.
73,
Chris
On Tue, Feb 13, 2018 at 10:55 AM, Frank Stein <fst...@ieee.org> wrote:
I was thinking of a similar remote setup, wondering which remote autotuner
is recommended?
Thanks,
Frank w4tg
On Feb 13, 2018 8:56 AM, "Chris Hallinan" <challi...@gmail.com> wrote:
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
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