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

[Gus]

Thanks for all info, Dom.

to construct a large (2M) helix with light weight, a non-traditional 
design of some sort might be tried.  Perhaps paint the helix on the 
surface of an inflatable cylinder, with conductive paint?

Also, what if the coils/turns are something other than circular? perhaps 
rectangular or triangular?

The brain has been tossing out crazy ideas recently, but in my 
experience, crazy ideas are not always crazy...



On 03/12/2014 04:49 PM, i8cvs wrote:
> 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
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>

-- 
Gus 8P6SM
The Easternmost Isle