[amsat-bb] Az-El Rotors
Edward R Cole
kl7uw at acsalaska.net
Mon Jan 25 18:38:39 UTC 2016
I agree with JoAnne:
Put up a small yagi fixed in elevation at 15-30 degrees with a cheap
antenna rotator for azimuth (Alliance HD73 or similar) and you will
be in business without the $700 cost of az-el. Even mounting an
Arrow this way is good to have hands-free operation.
I built a pair of Lindenblad antennas, which was an interesting
project, and they worked OK. But I missed having the gain of a yagi
system for stronger reception of the sats (my old system was rated
for AO-40). I have taken down my Lindenblads.
I've acquired a replacement controller for my Yaesu B5400 and will
re-install part of (26-elements) of my M2 436CP42 and have a
7-element M2 2m yagi on a short tower with the B5400. Probably will
not get to this until spring. You can see what I have done here:
73, Ed - KL7UW
From: "JoAnne Maenpaa" <k9jkm at comcast.net>
To: "'AMSAT bbs'" <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] Az-El Rotors
Content-Type: text/plain; charset="utf-8"
> ... starting with a small single antenna with both 2m and 70cm on
> it (i.e. Arrow or other) ...
I've found that an azimuth-only rotor with a fixed elevation of 20?
or so works well enough for most of what I do with LEO satellites. I
got my rotor from ebay for $20. It is a primitive setup - manual
tracking. Much of the time I prefer using an Arrow antenna.
If you are looking for rotor projects there have been two designs
published over the past year or so in the AMSAT Journal. Here is some
information you can use to find out more about these:
The AMSAT store has the printed circuit board for WA8SME's WRAPS
inexpensive, portable az-el rotor system. See http://store.amsat.org
and look for the "WRAPS Tracker Circuit Board". There is also a link
to the article by Mark, WA8SME.
Bob, KI4SBL, wrote an article about his homebrew az-el rotor system,
"CNCTRK ? A LinuxCNC Based Satellite Tracking System", for the AMSAT
Journal. Bob has details of this project and the parts he sells along
with a PDF of the article posted on his web site:
73 de JoAnne K9JKM
k9jkm at amsat.org
73, Ed - KL7UW
"Kits made by KL7UW"
Dubus Mag business:
dubususa at gmail.com
More information about the AMSAT-BB