It's in my 2002 handbook also. ONE little short paragraph! LOL! Right after the expanations of trap antennas. If my noise situation gets to the point I think I might be able to work 80M I will look at putting a loading coil in my 40M antenna.
Thanks, Bob Macklin K5MYJ/7 Seattle, Wa. "REAL RADIOS GLOW IN THE DARK" ----- Original Message ----- From: "Edward B Richards" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, January 24, 2005 2:28 PM Subject: Re: [AMRadio] Stealth Antennas? > 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" <[EMAIL PROTECTED]> > 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" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Cc: <[EMAIL PROTECTED]> > > 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" > > <[EMAIL PROTECTED]> > > > 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" > > > > ______________________________________________________________ > > > > AMRadio mailing list > > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > > Help: http://mailman.qth.net/mmfaq.html > > > > Post: mailto:[email protected] > > > > > > > > > > ______________________________________________________________ > > > AMRadio mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > > Help: http://mailman.qth.net/mmfaq.html > > > Post: mailto:[email protected] > > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:[email protected] > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] >
