Re: [amsat-bb] 70cm helical antenna

[Richard@xxxxxxxxxxxxxxxxx (Richard W L Limebear)]

 Jeff Davis writes:

> anybody using a helix on 145mhz with any success?

I built and used one for AO-6 in my early satellite days. They work. But, as 
someone already commented, a 2m helix is BIG. I took mine through the local 
streets for a local show - the locals still laugh about this satellite nut 
walking down the road carrying a giant bed-spring. I still have a couple of
70cm helices in my attic: broom-handle up the middle and the spiral is made
from some old coaxial cable (inner and outer shorted together).

But you can't change the polarization once its made - I did these because I 
couldn't understand how to *phase* a crossed yagi.

I see the RSGB are still using parts of my "how to make it" article (from 
about 1974) in their latest handbook (RSGB Handbook, seventh edition,
pp 14.31/32)   ;)

73
Richard W L Limebear G3RWL
g3rwl@amsat.org
FOC # 1188

          So many beautiful girls ..... (sob) so little time
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