[amsat-bb] Re: TH-D7A Transmit Issues - Or Maybe Arrow Issues????

Rick Tejera saguaroastro at cox.net
Wed Jan 12 16:45:08 PST 2011


I use my TH-D7A with a home brew Dual band yagi (Kent Brittan's Plans). I
note that once I dial in the proper polarization on the antenna I can work
most of the pass with only slight adjustments. As the pass nears it's end
(these are South to North passes) I notice I have to readjust the
polarization of the antenna quite radically. 

One thing with the arrow is that the two bands are at 90 degrees to each
other, I've always wondered how that affects things. If you're dialed in on
70cm, you're going to be off on 2m and vice versa. My homebrew antenna has
both bands on the same plane.

Clear Skies

Rick Tejera
Editor SACnews,
Public Outreach Coordinator
Saguaro Astronomy Club
Phoenix, Arizona
saguaroastro at cox.net 
K7TEJ, AMSAT 38452

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Zachary Beougher
Sent: Wednesday, January 12, 2011 15:29
To: amsat-bb at amsat.org
Subject: [amsat-bb] TH-D7A Transmit Issues - Or Maybe Arrow Issues????

Since we are on the subject of satellite equipment, I have a question: 

I was on AO51 a bit ago, and I was able to get in okay at the beginning
using the THD7A for transmit, but as the pass went on it was impossible for
me to get in, even when there was dead silence.  I tried the D7 afterward
(using the Arrow like I would for a pass) on a couple local repeaters, and I
was having a hard time getting into them, when usually I could hit them with
a duck.  I pulled the Arrow off and stuck the duck on, and I can get into
all the repeaters fine.  Keeping all of that in mind, I went back to the
Arrow and put a THG71A on in place of the D7 (same battery that was in the
D7), and I could hit the repeater okay.  I put the D7 faceplate back on, and
it would not work.

With the above information, I am getting indications of both an issue with
the radio and/or Arrow.

Any ideas as to what the issue might be????

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