[amsat-bb] Re: Compact Quadrifilar Helix antenna

[Bruce Robertson]

On Wed, Dec 30, 2009 at 4:15 PM, Edward Cole <kl7uw at acsalaska.net> wrote:
> At 09:14 AM 12/30/2009, Andrew Glasbrenner wrote:
>>Jeff Kelly wrote:
>> > This antenna has been out for a while:
>> >
>> >
>> http://www.antennas.us/store/p/229-UC-4364-328-Amateur-Satellite-antenna.html
>> >
>> > any feedback on it?
>> >
>> > Jeff
>> > KT2K
>> > _______________________________________________
>> > Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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>> >
>> >
>>Works OK with a good preamp. I have one mounted on my Explorer with some
>>magnets from Harbor Freight, and an ARR preamp. Lots of guys here in
>>deed-restricted communes, err, communities use them because of their
>>stealth qualities.
>>
>>73, Drew KO4MA

A practical alternative is to build the QFH from the recent QST
article. I have just finished one of these, and it seems to work
reasonably. As luck would have it, I just posted notes on the process
on my blog at

http://ve9qrp.blogspot.com

This is the RHCP version provided in the article. I found the downlink
from VO-52 to be rather more weak than, say a vertical or dipole. I
attribute this to the difference in circular polarity. I, too, am
interested in switched circularly polarized omnidirectional antennas.
I think I might make a AA2TX lindenblad for the corresponding LHCP
unit.

Does anyone have recommendations for RF switches suited for 2m work
and N-connectors?

>
> If you like building antennas, you might look at the Lindenblad which
> performs similarly.  I am finishing up my dual-band pair and may get
> them installed, today:
> http://www.kl7uw.com/LBant.htm
>
> I will fill in more info on this page in a day or two (just a few photos, now)
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
>  BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
> 500-KHz/CW, 144-MHz EME, 1296-MHz EME
> DUBUS Magazine USA Rep dubususa at hotmail.com
> ======================================
>
> _______________________________________________
> 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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>



-- 
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