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

[Gus]

Thank you again, Dom.

Just ordered "Big Ear".  $3.96 2nd hand.  It'll be several weeks before 
it reaches me.

On 03/13/2014 01:42 AM, i8cvs wrote:
> ----- Original Message -----
> From: "Gus" <gus at 8p6sm.net>
> To: <amsat-bb at amsat.org>
> Sent: Thursday, March 13, 2014 2:20 AM
> Subject: [amsat-bb] Re: Question for the antenna gurus
>
>> 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?
> Hi Gus, 8P6SM
>
> In my opinion it is best to use for the helix a thick  annealed
> aluminum pipe because an inflatable cylinder for 2 m and 70 cm
> with conductive paint has been experimented for high frequencies
> but the tube is extremely large in diameter for 2m and 70 cm.
>
>> Also, what if the coils/turns are something other than circular? perhaps
>> rectangular or triangular?
> If you use a coils/turns rectangular shape elements with a proper reflector
> and feed system you make a "Qubical Quad "
>
>> The brain has been tossing out crazy ideas recently, but in my
>> experience, crazy ideas are not always crazy...
>>
> If the ideas are supported by a right theory they are not crazy ideas as it
> was demonstrated by Dr. John Kraus W8JK the inventor of the axial-mode
> helix antennas.
>
> I suggest you to read the book "BIG EAR" by John Kraus edited by Cignus
> Quasar Books Chapter 13 CORKSCREWS containing the Kraus idea on
> how borned  in his brain the idea to invent the axial-mode helix antenna.
>
> In a separated email I have sent to you the article "The advantages of
> circular polarization" by K4KJ that explain the above matter with many
> drawings and pictures.
>
> Have fun.
>
> 73" de i8CVS Domenico
>
>> 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
>>>> _______________________________________________
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> author.
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>>> _______________________________________________
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>>>
>> --
>> 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!
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>


-- 
Gus 8P6SM
The Easternmost Isle