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 http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
The http://aprs.org/outnet.html page now shows the OUTERNET coverage. It is virtually worldwide... Bob -----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Edward R Cole Sent: Friday, October 07, 2016 11:45 AM To: amsat-bb@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 http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
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participants (2)
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Edward R Cole -
Robert Bruninga