[amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?)

davekn4ok@aol.com davekn4ok at aol.com
Wed Apr 7 03:00:29 PDT 2010

Bill, from my experience it happens when there are lots of high power signals pulling down the RX.

See ya on the bird,

Dave, kn4ok

-----Original Message-----
From: Bill Dzurilla <billdz.geo at yahoo.com>
To: amsat-bb at amsat.org
Sent: Tue, Apr 6, 2010 9:07 pm
Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?)

So, folks, does anyone have any thoughts or comments about this issue?
3, Bill NZ5N
--- On Sun, 4/4/10, Bill Dzurilla <billdz.geo at yahoo.com> wrote:
From: Bill Dzurilla <billdz.geo at yahoo.com>
ubject: AO-7 Mode C?  (Or other reason for varying signal strength?)
o: amsat-bb at amsat.org
ate: Sunday, April 4, 2010, 10:52 PM
Hi folks,
Since starting my effort to work Europe on AO-7, I've found that the very low 
levation sigs vary significantly on different 
asses.  Some mornings I can easily hear my downlink and start working 
urope at 0.7 degrees elevation, while other days I can't hear myself 
ntil 5 degrees elevation, after the window to Europe has closed.  Not 
ure if this is due to band conditions, satellite polarization, 
bstructions at certain positions, operator error, local noise, or what.
Today I spoke with another experienced AO-7 op and he had an interesting theory: 
n the bad days (when I don't hear my downlink until 5 degress), the sat is in 
ode C (lower power).  This seems to make sense, because there does not seem to 
e any middle ground -- I start hearing my downlink at either 0.7 degrees or 5 
egrees, never at 2-4 degrees.
Anyone have any thoughts on this?  Are we able to predict when the sat will be 
n one mode or another?  Or any other explanation for the signal strength 
73, Bill NZ5N 


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