Ted Hart (W5QJR)
Theory
Construction
Tuning
Flat EH 1,8 MHz
Flat EH 3,5 MHz
Flat EH 7 MHz
Flat EH 10 MHz
Flat EH 14 MHz
Flat EH 18-28 MHz
Flat EH 145 MHz
Other
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Thank you for visiting my website and I hope you become regular visitors because I will be adding and updating to its contents on a regular basis.
The contents of this website relate specifically to the construction and tuning of the W5QJR flat EH antennas. The beauty of these antennas are their small size relative to their Hertzian counterparts i.e. on average, 2% - 3% of a wavelength. They are cheap to construct and they use non-Hertzian principles. The tuning of flat (and cylindrical) EH antennas are different to that used for conventional antennas and as a result, some radio hams have experienced difficulties when tuning these antennas. My ‘Tuning’ article for flat EH antennas can be found below. I also include the results and data from my many experiments on these antennas and I am actively looking to collaborate with as many radio hams as possible to find out more about what makes them work as efficiently as they do.
Updates:
- Added new links.
- Tuning Flat EH antenna - article is added.
- Flat EH 1,8 MHz - article is added.
- Flat EH 3,6 MHz - article is added.
- Ted Hart (W5QJR) - article is added.
- Flat EH 14 MHz - article is added.
In April, 2007, Ted Hart (W5QJR), published his article "Simple flat EH antennas for the 145 MHz band" and also made his design available so that other radio amateurs could try it for themselves. There is a lot of information available on the Internet including RF data from an anechoic chamber and other experiments relating the field strength of EH antennas to dipoles and other Hertzian-type antennas. The author of this site has conducted numerous experiments with Ted’s design of flat EH antenna and scaled his early design for other (HF) amateur bands. Results have been very good and sometimes I have been amazed at what can be achieved with such a small antenna. This inspired the idea behind my website purely for flat EH antennas. I hope you find the contents of the website interesting and that you too, construct a flat EH antenna on the bands of your choice. Please come back often as its contents will be updated on a regular basis. I would also be very interested and thankful to anyone who sends me details of their experiences with flat EH antennas because the only way you can understand them is to build one and compare what you receive/transmit with your normal Hertz antennas etc. If applicable, I will put your story on my website as there appears to be very many different ways to experiment with these antennas.
Thank you.
Vladimir Kononov ( Vlad - UA1ACO). E-mail: spbkv@yandex.ru
Sorry for my bad English.
Thank you Dr Ellis Evans (SV0XBU/G1PDA) for helping me re-phrase some of my website pages into some pages into more easily understood English because English is not my first language .
Vlad UA1ACO
March 2010
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1998
