[amsat-bb] Re: Simple 2.4Ghz helix plans?

[Luc Leblanc]

On 31 Oct 2009 at 0:03, Michael Tondee wrote:

Date sent:      	Sat, 31 Oct 2009 00:03:02 -0400
From:           	Michael Tondee <mat_62 at netcommander.com>
Subject:        	[amsat-bb]  Simple 2.4Ghz helix plans?
To:             	Amsat BB <amsat-bb at amsat.org>

> I threw this out there on the eham satellite forum looking for answers 
> but I'll try here too.
> I'm looking for some fairly simple plans for this antenna. Everything I 
> find either seems to be intended for WiFi or if it is ham related is 
> full of mathematical formulas to figure length, diameter, spacing etc.
> Math was never my strong suit so I'd prefer to find something with the 
> actual already computed dimensions clearly stated. Preferably in English 
> rather than metric measurements. I found an article in the May/June 2008 
> AMSAT Journal that looked promising but there are no hard numbers, just 
> the formulas  and I don't have a calculator capable of some of the  
> computations, much less being able to work them out in my head. Been a 
> long time since I was in school!.. hi hi... I have a downconverter I'm 
> not sure even works and I don't want to spend a huge amount of time and 
> trouble to be able to test it.
> Tnx and 73,
> Michael, W4HIJ
Here is another variation on the same subject. Even if some maths are present they are not too much out of range for the non maths incline.
What i like is there is no need for a circular reflector as they used a square sheet of metal for the reflector.

http://helix.remco.tk/

But here is some cheap and very effective antennas at 20$ it is a deal if you just look at the cost and time spent on building an helix 
plus if you want to received something in the other circular polarisation you will not have this huge attenuation near 60 db's only 3 db's 
and  don't forget AO-51 2.4GHZ is linear polarized not circular.

http://cgi.ebay.com/16-dBi-2-4-GHz-802-11b-g-Wifi-Yagi-
Antenna_W0QQitemZ170388251288QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item27abee6298

Another one with a N type connector even cheaper with free shipping...I just ordered one...

http://cgi.ebay.com/New-2-4GHz-Directional-Antenna-18Dbi-for-Wifi-
Wireless_W0QQitemZ190333956933QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2c50c9b345

http://cgi.ebay.com/16-dBi-2-4-GHz-802-11b-g-Wifi-Yagi-Antenna-N-
F_W0QQitemZ280408804827QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4149aacddb









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