Just wanted to add that during a recent
A/B comparison of 40 meter inverted vees
at 30 and 60 foot heights, I also tried
them on 15 meters (3rd overtone mode).
As expected, they loaded up perfectly.
What was interesting was that the 60 foot
high inverted vee TOTALLY BLEW AWAY the
30 foot high inverted vee. I mean like 3, 4,
5 S-units on the FT1000. It wasn't even
close. OTOH, on 40 meters, the two
vee's were nearly interchangeable except
for NVIS mode. It sure seems to me that
N4KG is making sense.
Rick Karlquist N6RK
richard@karlquist.com
www.n6rk.com
www.karlquist.com
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of Guy
> Olinger, K2AV
> Sent: Monday, June 24, 2002 7:20 AM
> To: TOWERTALK@contesting.com; swca@swbell.net; n4kg@juno.com
> Subject: Re: [Towertalk] Re: [Force 12 Talk] XR dilemma
>
> And will anyone mention that this angle business is a very sparsely
> supported "science" with a lot of unanswered questions and
> modes, and
> lots of unexplained contrary anecdotal material.
>
> Used a 15 foot high fifteen meter dipole as a teenage
> Novice operator
> in Kentucky. Since nobody had tried to tell me that all that energy
> would go straight into outer space, I went ahead and worked a couple
> thousand contacts on it, more USA than not. I got lots of 599/589
> reports running a mere 50 watts, at a time where you had to get the
> QSL address over the air because you couldn't afford a call
> book, and
> the automatic 599 hadn't been invented yet.
>
> I worked all the surrounding states on 15 meters. This on a
> frequency
> higher than in the original post. How does one do that if
> those angle
> formulas are really absolute and trustworthy?
>
> ***!!!>>> Or is it really that the angle formulas describe a rather
> broad and fuzzy center of probability, with a lot contrary evidence
> suggesting that there is something yet to be discovered?
>
> 18 MHz dipole at 20 feet will work. Easy experiment. Try it. See how
> many Europeans you work and get 5NN as a report.
>
> 73, Guy.
>
>
> ----- Original Message -----
> From: <n4kg@juno.com>
> To: <TOWERTALK@contesting.com>; <swca@swbell.net>
> Sent: Monday, June 24, 2002 8:39 AM
> Subject: Re: [Towertalk] Re: [Force 12 Talk] XR dilemma
>
>
> > Hi Mark,
> >
> > I think our main disagreement comes over the the maximum
> > angle that is supported on 10M. I believe that to be around
> > 20 degrees (at very high MUF's).
> >
> > Some time ago, someone plotted his 10M SS contacts on
> > a map. The vast majority were at skip distances of 900 miles
> > or more, which corresponds to a 20 degree takeoff angle.
> >
> > At 18 ft, a 3L 10M Yagi places the majority of it's radiation
> between
> > 20 and 30 degrees. 3 dB points are 15 and 40 degrees. Over
> > 80% of the energy is above 20 degrees, i.e. going into
> outer space.
> >
> > At 35 ft, the 3 dB points are 7 and 22 degrees with the vast
> > majority of the energy falling in the range of angles supported
> > by the ionosphere. I see NO BENEFIT in going lower than
> > 35 ft on 10M.
> >
> > Tom N4KG
> >
> >
> >
> > ________________________________________________________________
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>
>
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