[amsat-bb] Global Geo SATCOM system?

Robert Bruninga bruninga at usna.edu
Fri Oct 7 16:28:24 UTC 2016

The http://aprs.org/outnet.html page now shows the OUTERNET coverage.  It
is virtually worldwide...
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Edward R
Sent: Friday, October 07, 2016 11:45 AM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Global Geo SATCOM system?

After Bob posted the info and links to Outernet I looked over the
equipment and the satellite footprints.  Not clear to me if there would be
any reception at my latitude and longitude (60.688N, 151.331W).

 From years past I recall how few ISS passes came above the southern
horizon far enough to any chance of contacts (max elev is 11-degrees for
about 12-min long pass).  And ISS is in Leo orbit so its constantly
changing.  A geo sat is fixed so you get - what you get (if it is too far
east or west of me that is "nothing").  Highest elev angle for Geo-sat
orbit is 21 degrees looking due south.  Trees (solid forest) set lower
elev limit at about 9-degrees in all directions.

I used a 33-inch offset feed dish on AO-40 so that is available to put up
with suitable feed.  The 8-dBi patch may have too wide a beam pattern for
use with such a dish.  I wondered if using a cylindrical short cavity with
the patch might increase gain and narrow the beam adequately?  For 2.4G I
used a six turn helical feed (RHCP).

Good info on the rtl-sdr.  I gave one to my step-son which we were unable
to get good performance on VHF so maybe he would send it back to me.  I
sent him a used RS HF receiver which is what he wanted.  Pretty sure the
rtl-sdr is not in use (he was using Mac-OS which further complicated and
frustrated getting sw running); I have win-XP32.

73, Ed - KL7UW
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com

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