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Re: AO40 TLM feed from 12m dish



Thanks for the reports Bob.  It is interesting to have something to compare
a more modest set up with.

I made my second attempt at copying AO40 s-band today with a portable set up
in the parking lot at work during lunch.  Since I wasn't sure what the
effect of  the attitude changes would be I tried first at 1529z - 1545z
without hearing a peep.  When I got back to the car at 1628z the signal was
about 7 s-units above the noise.  I was able to stay with it until LOS at
1644z with about 5 degrees elevation.

I was using a homebrew 16 turn helix from K4OE's web site, a Millicon
downconverter mounted directly at the antenna feed with the IF output into
my IC-290H.   Antenna pointing was based on printed look angles and a
compass then sweeping the elevation around a bit to peak up the signal.

73's,
Lee-KU4OS

Special thanks to Art, KV4BU, who does a pretty good job as an az/el rotor.

----- Original Message -----
From: "Bob Bruninga" <bruninga@usna.edu>
To: <amsat-bb@AMSAT.Org>
Sent: Thursday, April 05, 2001 13:25 PM
Subject: Re: [amsat-bb] AO40 TLM feed from 12m dish


> > We are feeding live APOGEE telemetry until LOS at 1630z today (5 Apr) to
> > WA4SIR's reflector at NASA Goddard 128.183.143.104 port 1024.
>
> Fed 838 blocks with 17 having good CRC from 1230z to 1635z.  Most all of
> the good CRC were in the last 30 minutes even though the bird was still
> 31,000 km out.  The antenna pattern must have come around better then.
>
> Our location is 39.0N 76.5W
>
> de WB4APR, Bob
>
>
> ----
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