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Re: AO-40 Mode S Reception MA 249-253



At MA247 in FM72

az: 110
el; 15
squint: 152

signal just audible well in the noise, ... unlike yesterday when it was
great!

Paul
----- Original Message -----
From: "Doug Braun NA1DB" <na1db@yahoo.com>
To: "Paul Willmott" <pwillmott@northrock.bm>
Cc: <amsat-bb@AMSAT.Org>
Sent: Sunday, January 21, 2001 11:19
Subject: Re: [amsat-bb] AO-40 Mode S Reception MA 249-253


> Well, right now (Sunday 1500Z) at MA 247 I hear nothing at all.
> What was the azimuth+elevation for your QTH at that time?
>
> During perigee, different stations a couple thousand miles apart
> could have very different squint angles.
>
> My QTH is Princeton, NJ and at the moment the sat's
> azimuth is 105 degrees (elevation rapidly approaching zero...)
>
> Doug
> NA1DB
>
>
> At 05:28 PM 1/20/01 , you wrote:
> >Hi All,
> >
> >Today as the bird was setting I had a go at hearing the bird before
perigee,
> >... it was on the spur of the moment, ... but I found that I found it
> >straight away at MA 249 and pretty strong, ... I quickly turned on the
> >telemetry capture program P3T just in case. The Doppler was very very
fast,
> >... too fast for the G3RUH demodulator to keep up, I had to keep turning
the
> >radio dial very quickly to keep the demod centered. Anyway I lost the
signal
> >as predicted by my week old NORAD keps, .... I caught about 13 blocks of
> >telem between MA 249 and MA 253 (LOS) (none CRCC OK but readable!), ...
to
> >my ear they sounded as good as those I hear from MA 3 onwards, .... what
> >killed any CRCC OK capture was the Doppler, .... anyway for those waiting
to
> >test your new S band converters start looking at MA 245 now, don't wait
for
> >MA 2 onwards passes. .... lets see who can be first to capture a CRCC OK
> >block BEFORE perigee, ... it is now possible!!!!!! Given that the bird
moves
> >almost 180 degrees around the planet between 253 and 3, ... this gives
all
> >of us more chances to hear the bird, test our equipment, and more
important
> >capture telemetry!
> >
> >Please post your reception attempt results to the BB to let us know! ....
> >who will be first!
> >
> >BTW the spacecraft MA indicator is reset regularly, the MA's I quote
above
> >are from the tracking program not the spacecraft!
> >
> >Cheers
> >Paul, VP9MU
>
>
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