Mark Keith wrote:

Cecil Moore wrote:
I don't know and don't much care. The discussion is about your
antenna Vs mine.

Well, maybe at this point, but not previously.

The argument has always been about your coax-fed dipole antenna
Vs my G5RV antenna.

You missed the question...How would I know you do that unless you tell
me in advance...I'm not a mind reader...

My antenna is a G5RV. You said your dipole would beat "any" G5RV,
presumably including mine. Your ignorance of my G5RV didn't enter
into the discussion at the time. You didn't even slow down to wonder
if a well-designed G5RV might equal your dipole on 75m.

Yes. IF...But I will still prefer the coax fed dipole.

If the design flaws of the G5RV are fixed, we then shift from
performance to preference?

Your antenna is different than the vast majority used if what you
say is true.

It's a well-designed G5RV, the best I know of. You said you dipole would
beat "any" G5RV by S-units.

If you have improved yours, I'm glad. You may well have a decent
antenna. But you need to spread the word, because most other's that
are unmodified are still gonna be lame radiators.

I posted my actual measurements yesterday. To optimize a G5RV for 75m,
make the series section transformer 25 feet long and put a 1000 pf
capacitor in parallel at the coax/open-wire junction. The beauty is
that you still have the framework for an all-HF-band antenna. Take
away the cap and extend the series section to 36 feet and you have
a G5RV optimized for 40m and 17m, my favorite bands. It takes about
two minutes for me to make that change but it could be automated.

What proposal do you
offer to correct the feedline deficiencies of the average storebought
windom, or OCF dipole on 40 and 80m?

The original windom, powered by a tube transmitter with a pi-net matching
network, was a pretty good antenna. For today's "Windoms", I would advise
everyone to feed OCF's with open-wire line, equipped with an excellent
choke, at a current maximum point, using whatever ratio balun is appropriate.
I had an OCF in college, fed with open-wire line, powered by a Heathkit with
a pi-net tuning network. It's feedpoint impedance on the harmonically related
bands was in the neighborhood of 300 ohms. Matching a tube final to 300 ohms
through a pi-net tuner is pretty much a no-brainer and relatively lossless.
--
73, Cecil, W5DXP



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----