[amsat-bb] Re: Question for the antenna gurus

i8cvs domenico.i8cvs at tin.it
Wed Mar 12 13:49:59 PDT 2014

Hi Gus, 8P6SM

Mounting 3 turn helix antenna for 2400 MHz concentrically
inside a 3 turns helix antenna for 1268 MHz was used as a
feed both wounded LHCP to illuminate a ground station prime
focus dish for RHCP uplink and downlink on Mode-L/S for
AO40 and it worked very well.

If you plan to build a 10 turns RHCP helix antenna for 70 cm
conentrically into a 5 or 6 turns RHCP helix antenna for 2 meters
in my opinion it should work as well but the weight of this
antenna will be very very hight and not practical to be used in
comparison with yagi antennas.

73" de

i8CVS Domenico

----- Original Message -----
From: "Gus" <gus at 8p6sm.net>
To: <AMSAT-BB at amsat.org>
Sent: Wednesday, March 12, 2014 9:33 AM
Subject: [amsat-bb] Question for the antenna gurus

> Regarding axial-mode helix antennas, what happens if you build a helix
> for each of two different bands (like 2M/70cm), and mount them
> concentrically, on the same backplane?
> --
> Gus 8P6SM
> The Easternmost Isle
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