Posted on Feb 23, 2024
How satellites send messages w/Neil deGrasse Tyson
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Interesting perspective of satellites for sending messages from the U.S. and Europe and of course other locations on Earth! Probably not something one thinks of in the course of everyday life, but it is interesting! LMK what you think...
Enjoy,
Kerry
________________________________ ✼✼☼✼✼ ______________________________
Enjoy,
Kerry
________________________________ ✼✼☼✼✼ ______________________________
Communications
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Edited 2 mo ago
Posted 2 mo ago
Responses: 5
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Sgt (Join to see) Hopefully You don't expect Me to Remember the Channels and Order in the Multiplexing, Been a Long Time since I was Involved with SATCOMs.
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SPC Michael Terrell
C-band was 24 channels, using Vertical or Horizontal polarization . All odd channels used one polarity while even channels used the other. I still have a Microdyne C-band signal generator built for use at their factory. We built equipment for CATV, MATV and TV Broadcast. Our main product was Telemetry receivers that could be used on any band, with the proper downconverter.
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Sgt (Join to see)
Whatever the technology might be, PO1 William "Chip" Nagel, new or old, I am always interested, as it defines how much we have learned over the last several hundred years or maybe as far back as the 1500's or more! LOL!!!
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I repaired a lot of that equipment, and built some of it. For instance, the old C-band satellite TV was uplinked at 6GHz. It was down converted to 4GHz, amplified and transmitted back to earth. Some antennas covered the entire United States, while others concentrated on one half of the country or the other, The birds used Traveling Wave Tubes to produce up to 20 Watts. There were usually a couple spares aboard and had relays to swap out a defective TWT. Basic receiver design was based on original Telemetry or RADAR receivers, including a 70 MHz IF. In fact, the first receivers I serviced were Rockwell-Collins Telemetry receivers modified for C-band. $4,000 each, and crap design.
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