|
Title: What makes your antenna work? Post by: N4zed on May 25, 2015, 03:39:52 PM (This may belong in QSO but I figer it is a technical subject.)
Antenna Fundamentals 1 Propagation https://www.youtube.com/watch?v=7bDyA5t1ldU (https://www.youtube.com/watch?v=7bDyA5t1ldU) Antenna Fundamentals 2 Directivity https://www.youtube.com/watch?v=md7GjQQ2YA0 (https://www.youtube.com/watch?v=md7GjQQ2YA0) Antenna Fundamentals 3 Bandwidth https://www.youtube.com/watch?v=9iV_YICgifA (https://www.youtube.com/watch?v=9iV_YICgifA) I liked it anywho... Ken N4zed Title: Re: What makes your antenna work? Post by: W3RSW on May 26, 2015, 08:47:21 PM Good visuals. Love those training films, the Internet of their day so to speak.
Thanks for posting. Title: Re: What makes your antenna work? Post by: KA0HCP on May 27, 2015, 01:16:37 AM Thirty five years later I finally understand the Cosecant Squared antenna! Eureka!
Title: Re: What makes your antenna work? Post by: W3RSW on May 27, 2015, 08:33:08 AM Arrrrgh,
Think zombie trig identities coming back to haunt you. ;D ...and some parabolic analytical geometry. Y^2 = 2px and your horse too. Title: Re: What makes your antenna work? Post by: WZ5Q on May 27, 2015, 08:52:31 AM Arrrrgh, Think zombie trig identities coming back to haunt you. ;D ...and some parabolic analytical geometry. Y^2 = 2px and your horse too. NOOOoooooooo.......make it stop!!! Title: Re: What makes your antenna work? Post by: w4bfs on May 27, 2015, 09:44:23 AM JJJJJJJJJJJJJJJJJJJJJJJJJJ and J
Title: Re: What makes your antenna work? Post by: WD8BIL on May 27, 2015, 02:33:30 PM what makes my antenna work?????
3CX3000A7 Title: Re: What makes your antenna work? Post by: N4zed on May 27, 2015, 05:56:36 PM "3CX3000A7"
You don't need no stinking antenna ! Title: Re: What makes your antenna work? Post by: Steve - K4HX on June 08, 2015, 09:21:31 PM That's a driver tube.
Title: Re: What makes your antenna work? Post by: W3RSW on June 09, 2015, 09:39:44 PM for an MUF seeker extraordinaire.
Title: Re: What makes your antenna work? Post by: Opcom on June 11, 2015, 08:02:43 PM Don't forget about the Illudium Q-36 Space Modulator.
The Nr. 4 Renfrosnart, made by Chiltzangbrone Engineering, shows similar performance and may be subbed in case a Q-36 is not handy. Title: Re: What makes your antenna work? Post by: WZ5Q on June 12, 2015, 09:58:45 AM Don't forget about the Illudium Q-36 Space Modulator. The Nr. 4 Renfrosnart, made by Chiltzangbrone Engineering, shows similar performance and may be subbed in case a Q-36 is not handy. As a last resort, search for the original or NOS Uranium Pu-36 Explosive Space Modulator. Title: Re: What makes your antenna work? Post by: WO4K on June 12, 2015, 05:07:33 PM Well, yeah, of course that will work on a dipole. But what if your Isotron has a splined solenoid gudgeon?
Title: Re: What makes your antenna work? Post by: KB2WIG on June 12, 2015, 10:51:11 PM In regards to the Isotron, six hydrocoptic marzel vanes can be fitted. This additional innovation showed how side-fumbling was effectively prevented. klc Title: Re: What makes your antenna work? Post by: AJ1G on June 13, 2015, 03:59:46 PM What makes my antenna work? Being put up in the dead of winter. Everyone knows that a winter erected antenna of any type has at least 6 dB gain over a comparable summer erected antenna!
Title: Re: What makes your antenna work? Post by: WO4K on June 13, 2015, 06:28:44 PM The direct result of increased flux capacitance during winter solstice. Experiments in antenna erection at Stonehenge at winter solstice showed as much as +9dB.
Title: Re: What makes your antenna work? Post by: Opcom on June 14, 2015, 11:01:38 AM To be serious, the height is the main benefit for my shallow inverted V. Other things that make it work well are it being made of OWL and well insulated. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Any problems, like tuning it, are my fault because of using a "T" style matcher followed by a balun. The instructions reccommend a Johnson matchbox -like tuner and warn against balun use. The antenna has a high reactance and this needs to be dealt with by a balanced L tuner or an air coupled tuner (matchbox). Any other deficiencies are no more than what is expected from an 80M dipole. |