On Sunday, May 17, 2015 at 7:53:17 AM UTC-4, Helmut Wabnig wrote:
hello,
I am a newcomer in amateur radio shortwave and so far
have built a dipole antenna with ladder line.

Not a G5RV, not a ZEPP, not a DOUBLE ZEPP, not a DOUBLETT,
but a dipole, a non-resonant antenna, if you know what I mean.

Unfortunately the antenna feedpoint is 25 meters away.
Now I am searching for a remote automatic tuner
for balanced feed line, aka hen's ladder, and coax input.

Presently I am using a BG-430 military Generalstab radio tuner.
http://www.radiomuseum.org/r/zellweg...em_se_430.html
It is the lower right foto, the thing in the center with the 4 black
feet. Works only 80 and 40 meters.
In more detail:
http://www.radiomuseum.org/r/zellweg...geraet_ag.html
Look at the schematic, upper part.
The input coax connects to the "balun" transformer,
and two variometer coils connect to the antenna output.

I have not been able to find anything useable on the market.
SGC tuners are ruled out, they are strictly for long wires
and nothing else. They make their money with the UN and other
mobile militaries, amateurs are not existent for them.
Amateurs use dipoles and ladder lines.
No, you can't use an SGC on a dipole.
If you do, you are wasting your money.

What rermains are MFJ and LDG coax tuners in combination
with a 1:4 balanced transformer. Thus the 25 m coax line would see
a fine SWR and no losses due to reflections. The coax from the tuner
output to the balun input make very short to avoid reflection losses.
Very high voltages will oscillate there!

What I like less is the balun at the high end, would prefer
a symmetric tuner with a balun at the coax input and balanced
symmetric output, like the Zellweger tuner does.
The MFJ-974HB is also a fine thing.
Really symmetrical at the tuning circuits, but manual.

100 Watt are fine, 400 Watt are better. (Maximum in Austria)
Can you help me, please?
OE8UWW

Look OM. If you have some reason that you just don't want to work with SGC that's fine. Don't work with SGC. But telling those of us that are using their products successfully that we are totally atypical is needlessly provocative.

I took a Barker & Williamson, Terminated Folded Dipole that I had been using with fair success and removed the termination resister and the balun. Since folded dipoles have a feed point impedance of Three Hundred Ohms I attached Three Hundred Ohm window line at the feed point and ran that to the terminals of a stock SGC SG-235 Auto-tuner. I went from hearing a lot of stations that I could not work to hearing a lot more stations were I could work anything that I could hear if it didn't have some sort of pile up of legal limit power stations trying to work it. I have never used an Amplifier on HF so I don't know if I could work them if I did.

The results were so good in comparison to the Terminated Folded Dipole iteration that I added a Six to one Balun and used the built in tuner in my Yaesu FT-1000 Transceiver. I have had good results with that as well and am thus able to reserve The SG-235 for the antenna kit of a transportable station that I use for Emergency Communications exercises. The SGC has worked very well for me in that service as well. Since I'm using a military surplus variable length dipole for those exercises and the SGC Coupler has never failed to obtain a match your position on the company's role in amateur radio seems misinformed.

--
Tom Horne W3TDH