[amsat-bb] Re: satellite antenna
k7trkradio at charter.net
Tue Apr 24 17:08:09 PDT 2012
Let's not forget the Moxon turnstile....an excellent performer (sorry,
Jerry, they replaced my 'eggbeaters' !!)
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of K5OE
Sent: Tuesday, April 24, 2012 4:51 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: satellite antenna
I appreciate you plugging the venerable (aka "old") Egg2 design, and while I
still consider it a really good LEO omni antenna, it is with limitations.
With today's crop of LEO satellites, none are as strong as the ones
available when I first designed and built that model--specifically UO-14 and
FO-20 as prime examples of an earlier era's "easy sats." For newbies to the
birds, especially if you are starting from scratch, Bob's (WB4APR)
suggestion to use a 1/4 wave vertical for 70 cm downlink is a good first
antenna--simple and effective.
That antenna will give you coverage at high elevations--above 30 degrees,
but that means your pass times will be short and your range is narrow (in
distance). The Egg2 was designed for exactly the opposite, max gain at low
elevations, where most people struggled to hear anything (I know I did!).
If you want to work LEO's today (what choice do you have right now?), don't
consider an omni without a good preamp (NF < 1 dB). Else, you will become
frustrated and lose interest in an exciting hobby. For the price of a good
preamp, you could consider a small beam (such as Kent's "cheap yagi" and a
TV rotor. Trust me, you'll be happier trying to work AO-27, VO-52, SO-50,
You can try to search for a eggbeater antenna like this one
----- Original Message -----
From: "Carlos Poinho" <cu3ftcarlos at gmail.com>
To: AMSAT-BB at amsat.org
Sent: Tuesday, April 24, 2012 4:00:26 PM
Subject: [amsat-bb] satellite antenna
any one have a good idea for a omni directional antenna for the birds?
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
More information about the AMSAT-BB