SATELLITES.

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Presentation transcript:

SATELLITES

Satellites SO-50 AO-27 Mode V/U (J) FM Voice Uplink: 145.8500 MHz FM (2 m) Downlink: 436.7950 MHz FM (75 cm)

Satellite Info 30+ operating satellites, including ISS Any ham with privileges that allow transmitting on uplink frequency Use minimum power necessary (as always) Member contacted ham in England U/V means UHF uplink, VHF downlink V/U VHF up, UHF down

Satellite Orbits few hundred miles up 22,237 miles up Drawing http://www.gma.org/surfing/sats.html

Doppler Shift LEO – Low Earth Orbit 17,000 mph! Vs. Geostationary 17,000 mph! Start by tuning receive freq HIGH by 15 KHz End by tuning receive freq LOW by 15 KHz Sound file http://www.exploratorium.com

Satellite Location Get Pass Info from satellite tracking program, or Get Pass Info from web (see screenshot above)

Satellite operation Show up at correct time! Steer beam antennas, tune radios for Doppler Spin Fading due to rotation of satellite and antennas Very short voice contacts Callsign and GridSquare (WA1QKT FN32) FM Packet commonly used digital mode