[amsat-bb] (no subject)
Pierre van Deventer
pierrevd at icon.co.za
Sun Dec 6 22:45:06 PST 2009
I have seen this topic being debated on previous occasions.
Each and every time I have used AO51 I experience the same. If one uses a
hand held linear polarized Yagi for the down link the signal difference by
"twisting" the wrist is enormous. I have not made a point of measuring the
difference as such, but the down link signal varies from being full quieting
to virtually inaudible.
This was so before the flip and still so now after the flip.
73, Pierre ZS6BB
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Clint Bradford
Sent: 07 December 2009 05:15
To: Glenn AA5PK
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] Re: AO-51 - After the Change
>> ... I think the handheld ops have less trouble with the polarity
switching because tend to compensate more quickly with a twist of the wrist
That phenomenon is not evident now - nor has it ever been - for me on AO-51.
I know the engineers say I am supposed to be increasing or decreasing my
signal strength by 22 or 23db by merely twisting my Yagi 90 degrees. But I
have hundreds of witnesses during dozens of demonstrations who will tell you
that when the Yagi is turned 90 degrees, there's no discernible change in
This is not a scientific approach to the subject, of course. Just what my
aging ears can hear.
I have heard fellow AMSAT members describe AO-51's "signal fading due to the
satellite tumbling in space," too. I am not using elaborate equipment, but
have no idea what they are talking about.
Just my firsthand observations. Guess I could be wrong ... we are a little
different - I am told - out hre on the West Coast of the US.
Clint Bradford, K6LCS
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