[AMRadio] Stealth Antennas?


Edward B Richards zuu6k at juno.com
Mon Jan 24 17:28:05 EST 2005


Hi again, Bob;

My 2003 ARRL Handbook mentions them on page 20.7. It states that the ARRL
Antenna Book shows how to design them. Good luck.

73, Ed Richards K6UUZ


On Mon, 24 Jan 2005 13:51:36 -0800 "Bob Macklin" <macklinbob at msn.com>
writes:
> Ed,
> 
> 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.
> 
> Bob Macklin
> K5MYJ/7
> Seattle, Wa.
> 
> "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>
> > writes:
> > > 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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> >
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