|[AMRadio] Stealth Antennas?|
macklinbob at msn.com
Mon Jan 24 16:51:36 EST 2005
Thanks for the link. Of all the books I have this option is not covered. And
there is no reason it won't work. It just makes the tranmiter more happy. It
won't improve receiver sensativity. It takes real area for that problem.
I understand base loading for the lower HF bands but center loading is
common for 10M and higher. That's why I was considering it.
Also you can bend a wire antenna but should have at least 1/8W from the
feedpoint before the bend.
"REAL RADIOS GLOW IN THE DARK"
----- Original Message -----
From: "Edward B Richards" <zuu6k at juno.com>
To: <amradio at mailman.qth.net>
Cc: <glowbugs at piobaire.mines.uidaho.edu>
Sent: Monday, January 24, 2005 1:20 PM
Subject: Re: [AMRadio] Stealth Antennas?
> Hi Bob;
> Base loading a mobile whip allows for taping the coil for a better
> impedance match.
> You certainly can use a loading coil in the center of a long wire or wire
> HF antenna. It is quite common to do so. There used to be someone who
> advertised center loading coils for HF antennas. I have not seen an ad
> recently. Spi-Ro MFG, inc www.spiromfg.com offers shortened antennas
> for some of the amateur bands. Also just the "shorteners". It is easy to
> make your own. Get a couple of one foot pieces of 1-1/4 PVC pipe and some
> varnish insulated # 14 wire and wind your own. Good luck.
> 73, Ed Richards K6UUZ
> On Mon, 24 Jan 2005 12:38:02 -0800 "Bob Macklin" <macklinbob at msn.com>
> > I live in a senior apartment where I CANNOT have an outdoor antenna.
> > So I
> > have a wire around the wall at the base of the ceiling. It is
> > currently 1/4W
> > 40M antenna.
> > I did buy the ARRL book on "Stealh Radio".
> > HF mobile antennas use loading coils to make the antenna look
> > longer. The
> > better one us a coil in the center of the antenna.
> > Some apartment antennas are nothing but a mobile whip with a base
> > loading
> > coil. Why BASE LOADING?
> > But the real question is why not use a loading coil at the center of
> > a long
> > wire or dipole to make it look longer? The original Heath Antenna
> > Tuner was
> > just a loading coil("L" section) that allowed use of a SHORT wire
> > with the
> > small Heath transmitters. The DX-20 through DX-40.
> > Bob Macklin
> > K5MYJ/7
> > Seattle, Wa.
> > "REAL RADIOS GLOW IN THE DARK"
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