Title: W aircraft antenna explanation Post by: K6JEK on June 20, 2009, 02:33:54 PM A private pilot friend of mine came by with a picture of an aircraft com antenna, "Bob Archer's W" How can this work? he asked. Although the feed wasn't obvious I guessed it was a dipole and said that bending the ends of dipole doesn't have much of an effect on performance.
But I can't really answer how it works because it's not just the ends that are bent. It bends right in the middle. It doesn't really look like a W either. I might have been able to fumble my way through an explanation of something that really is a W. Take a look at this thing? How does it work? Title: Re: W aircraft antenna explanation Post by: KD6VXI on June 20, 2009, 04:02:43 PM http://home.hiwaay.net/~sbuc/journal/bob_archer.htm
Dipole, bent to fit. That "assembly" you see attached is a gamma, of some sort. --Shane Title: Re: W aircraft antenna explanation Post by: K6JEK on June 20, 2009, 11:46:21 PM http://home.hiwaay.net/~sbuc/journal/bob_archer.htm Thanks. That makes sense.Dipole, bent to fit. That "assembly" you see attached is a gamma, of some sort. --Shane Title: Re: W aircraft antenna explanation Post by: KM1H on June 21, 2009, 12:29:32 PM I designed and built many like that, at one of my jobs, for microwave frequencies. Several were on a PC board and that center part was a stub tuned to match them all to a 50 Ohm line. Etched on board power dividers and phasing lines were easy at 5.8 gHz. One of the prototypes I made is at the 120' level of the big tower for 8 years for my Internet link. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Carl KM1H |