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The NLO Crossed-Wire Electrically-Steerable HF Antenna

The Proposal.
Feeding Configurations.

 EZNEC Simulations (Calculations performed using EZNEC+ v5.0)

HF
 Input impedance 1.6 - 30 MHz .
Far field: 160m (1.81 - 2 MHz) band .
Far field: 80m (3.5 - 3.8 MHz) band .
Far field: 40m (7 - 7.2 MHz) band .
Far field: 30m (10.1 - 10.15 MHz) band .
Far field: 20m (14 - 14.35 MHz) band .
Far field: 18m (18.068 - 18.168 MHz) band .
Far field: 15m (21 - 21.45 MHz) band .
Far field: 12m (24.89 - 24.99 MHz) band .
Far field: 10m (28 - 29.7 MHz) band .

LF
 Far field and input impedance: 500KHz .

Update. 2nd Jan 2010.
Due to recurrent severe weather affecting the NLO site, a decision was made to replace the aluminium masts with wooden telegraph poles. The Western Power Distribution company very kindly agreed to donate and install suitable poles and has supplied the poles on site. The poles were due to be installed on Sept. 18th 2009, but due to late objections, the installation has been postponed until such time as the issues raised can be resolved.
     David Knight would be interested to hear from persons, clubs, or institutions situated within reasonable driving distance of Ottery St Mary who are interested in hosting this project. The facilities which can be provided by the antenna and its ancillary equipment are as follows:
• An electrically steerable HF radio antenna.
• A polarisation diversity NVIS system.
• A public science demonstration facility for radio and atmospheric phenomena.
Site requirements are as per the above proposal.
If interested, please contact:

© D W Knight 2008.
David Knight asserts the right to be recognised as the author of this work.

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