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Re: ao40



I also experienced images that I thought were my downlink.  I didn't get any
QSOs either.  Then one day I really heard my signal, it was weaker and . . .
. . HAD A TIME DELAY. !!!   If you discover that you are really hearing a
false image, I can point you to a thread that has many suggestions and 1
fix.

73's  Tracy


----- Original Message -----
From: "Jim Walls" <k6ccc@earthlink.net>
To: "Malcolm M. Preston" <malnp2l@attglobal.net>; "amsat-bb@amsat.org"
<amsat-bb@AMSAT.Org>
Sent: Sunday, January 20, 2002 11:30 AM
Subject: Re: [amsat-bb] ao40


> "Malcolm M. Preston" wrote:
>
> > The time is 1230Z, 20 Jan.  I appear to be receiving my strong signal on
> > ao40 with minimal power (5 watts) on 440 up.  Stronger than the beacon
with
> > no leila or anything.  My dial indicated frequencies uplink 435.713.5
and
> > downlink 2401.220.7.  The signal is s9, strong and steady.  No
responses.
> > My antenna is pointed az 102 deg, el 31 deg.  Range is about 38000 km.
> > What I get is not AO10 which is up to the SW.  The signal has none of
the
> > AO10 qsb.  Am I nuts??  I can't figure anything else out this could be
but
> > ao40.  Unfortunately, I can't stick around longer this morning for other
> > obligations.
>
> Mal,
>     I'm guessing that you are actually hearing your uplink as a spur,
birdie,
> image, or some combination of these.  A couple things make me suspect
this.
> First is that with a signal stronger than the beacon, Leila should come
after
> you pretty soon - note I said should, not necessarily would.  Second is
the
> frequencies don't really quite match up - MAYBE.  I say maybe because as
we all
> know, there is a huge difference in downconverter accuracy, temperature
drifts,
> etc.  However (at least according to the cheater chart I use for my
> downconverter), you are about 45 KHz off frequency.  Lastly I would be
suspect
> of 5 watts producing a signal greater than the beacon unless you have a
really
> great antenna system.  Granted it takes quite a bit less power at that
range
> than near apogee.
>     Easy way to check is to wait until AO-40 is below the horizon, or
point
> your antennas well off the satellite and see if you still hear your
uplink.  If
> you do, obviously it's not being heard through the bird.
>
> 73
> -----------------------
> Jim Walls - K6CCC
> k6ccc@amsat.org
> http://home.earthlink.net/~k6ccc/
> 626-302-8515    FAX  626-302-7501
> AMSAT member 32537 / WSWSS member 395
>
>
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