[amsat-bb] Helical Antenna on 70 cm

Rolf Krogstad rolf.krogstad at gmail.com
Mon May 13 09:22:57 PDT 2013

I am new to satellites and new to the design requirements for UHF and am
looking for advice.

I am looking to build a Helical antenna for the 70cm Band.  I am
considering the plans for such an antenna from the 2010 edition of the ARRL
Satellite Handbook.  The plans call for a 235 cm (7' 8") long, 2.5 cm (1")
diameter center support made of either a wooden dowel which has been
treated or a fiberglass tube.  It also requires multiple 7.6 cm (3")
spacers for the helical element.

My question is would fiberglass rods made of "Isophthlic Polyester Resin"
be a good choice of material at UHF frequencies?
I hesitate to use treated wood because I plan to mount this on the top of a
15 meter high tower and it isn't very accessible.


Rolf   NR0T

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