Today's Message Index:
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1. 05:41 AM - Re: Dipole antenna fabrication (Eric M. Jones)
2. 11:54 AM - Re: Re: Dipole antenna fabrication (Robert L. Nuckolls, III)
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Subject: | Re: Dipole antenna fabrication |
> Bob N. said: But you paint a picture suggesting that a balun would make the difference
between communicating with some distant
> station . . . and not.
No, I didn't. Not at all. But I've flown across western stretches (Try Bishop to
Death Valley, pardner...). No Radar, no flight following, no radio communication
of any kind. I've also flown all over Mexico, where radio relay from plane-to-plane-station
is how it's done. In Baja, communications with the mainland
is typical...and very hard...but HEY, it's line of sight!
I am glad to see others post good info. There are many Hams out there who are quite
skilled in this area. Thanks Jan de Jong. I'll be building one of those for
my Glastar's vertical stab.
If local ops and $100 hamburgers is all you do, Bob N. is right. If you want better
performance for little extra effort, then I'm right.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=367431#367431
Message 2
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Subject: | Re: Dipole antenna fabrication |
At 07:39 AM 2/28/2012, you wrote:
> Bob N. said: But you paint a picture suggesting that a balun would
make the difference between communicating with some distant station .
. . and not.
No, I didn't. Not at all.
. . . I'm confused . . .
But I've flown across western stretches (Try Bishop to Death Valley,
pardner...). No Radar, no flight following, no radio communication of
any kind. I've also flown all over Mexico, where radio relay from
plane-to-plane-station is how it's done. In Baja, communications with
the mainland is typical...and very hard...but HEY, it's line of sight!
Okay, we're talking about fringe communications . . .
I am glad to see others post good info. There are many Hams out there
who are quite skilled in this area. Thanks Jan de Jong. I'll be
building one of those for my Glastar's vertical stab.
If local ops and $100 hamburgers is all you do, Bob N. is right. If
you want better performance for little extra effort, then I'm right.
I didn't know it was a right/wrong contest
but an quantitative evaluation of return on
investment. Did you agree that adding a balun
is unlikely to produce any observable effect
. . . yet hamburger runs makes Bob 'right'
and 'extra performance' makes him wrong
. . . ?????
Just for grins I went to the bench and set up
a receiver for 130MHz and turned on the HP
generator set for 30% AM modulation. I opened
the squelch and turned the radiated signal up
until I could just barely tell that there was
a modulated signal competing with the receiver's
noise floor at (0.10 uV); a reasonable simulation
of 'extreme fringe' communications.
I turned the signal up until I was reasonably
certain that I could deduce spoken words on
a still very noisy signal. It took 0.2 to 0.33 uV
(6 to 20 dB increase) to make that much difference.
Were I trying to carry on meaningful conversation
with cockpit ambients added in . . . maybe that
wouldn't have been enough.
If one compares balun vs. no-balun characteristics,
what factor of 'better performance' would you expect?
Bob . . .
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