I was wonder if it is posible to use a loop on 9 kHz. Serious problem to radiate 9 kHz is high voltage we saw. Loop has that advantage that voltage is not too high. Then i do some estimations. Let's
Peter Yes , the counter wound construction was challenged during the lecture and the concept of a mirror was introduced ... this then negated any constructional / geometric problems , by simply using
Dear Graham, LF Group, Well, scaling the 12 inch diameter coil on 160m would require about a 60 metre diameter coil at 9kHz, so still quite "challenging". It would need an impressive no-entry sign to
Graham, I would be most interested on seeing the construction of your toroid antenna. Any pictures? I couldn't get mine to work until I had got the structure resonant and designed a matching network
Making a Torodial antenna, as presented at the Egham HFC would be a good start .. the concept of the mirror differed from the published articles ... I made one and oddly it worked quite well at Hf ..
Dear Jim, to get constant Q one should scale coil dimension as sqare root of wavelength (if neglect dielectric losses). May be it sounds strange but it is so, sure. Conventional scaling wellknown in
When I was technical editor at the RSGB in 1994 an interesting article was received from Prof Jennison G2AJV on a toroidal antenna. Before publishing it I felt that I should make one. This turned out
