[amsat-bb] I wonder if this commercial quadrifilar helicoidal antenna any good?

[Rick Tejera]

here is the link, Save you the google search:

http://jcoppens.com/ant/qfh/calc.en.php



Rick Tejera (K7TEJ)
Saguaro Astronomy Club
www.saguaroastro.org
Thunderbird Radio Club
www.w7tbc.org
623-572-0713
623-203-4121 (cell)
SaguaroAstro at cox.net

-----Original Message-----
From: Ed Krome [mailto:e.krome at comcast.net] 
Sent: Wednesday, March 02, 2016 8:11 AM
To: Richard Tejera
Cc: Eric Christensen; Andrew Glasbrenner; AMSAT
Subject: Re: [amsat-bb] I wonder if this commercial quadrifilar helicoidal
antenna any good?

Google jcoppens.com
I just built one cut to 140MHz. Works OK (with rather broad 2M preamp) on
both weather sats and cubesats. Doesn't have great input return loss;
tweaking wouldn't hurt but I'm not going to mess with it. Get it as high and
clear as you can. 

Ed K9EK

Sent from my iPhone

> On Mar 2, 2016, at 12:13 AM, Richard Tejera <Saguaroastro at cox.net> wrote:
> 
> I made one for 137mHz to decode the NOAA WX says. Easier than it looks.
Cost was about $25. I found an online applet that calculates the dimensions
and prints a drilling template
> If your intersted,let me know and I'll dig up the url. (Bookmarked on
another computer)
> 
> Rick Tejera K7TEJ
> Saguaro Astronomy Club
> www.SaguaroAstro.org
> Thunderbird Amateur Radio Club
> www.w7tbc.org
> 
> On March 1, 2016, at 08:56, Eric Christensen <eric at christensenplace.us>
wrote:
> 
> On 03/01/2016 10:11 AM, Andrew Glasbrenner wrote:
>> I have the UHF model. It lives on a magnet base stuck to the side of the
AC air handler in my garage, and I hang my yard work hat on it. It was worse
than a 2m 1/4 wave whip on receive on AO-51.
> 
> Thanks, Drew (and everyone else that responded).  I just need to figure
> out how to get those M2 yagis up in the air, really.
> 
> 73,
> Eric WG3K
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