Showing posts with label SATELLITE COMMUNICATION. Show all posts
Showing posts with label SATELLITE COMMUNICATION. Show all posts

Monday, November 22, 2010

Five new Amateur Radio Satellites in orbit

FASTRAC-1, FASTRAC-2, NanoSail-D2, O/OREOS and RAX were launched at 01:24 UT on Saturday Nov 20, reports of the signals are needed.

So far signals have been reported from FASTRAC-2 (Emma), O/ORES and RAX.

Nominal Frequencies:
- FASTRAC-1 "Sara Lily" 437.345 MHz FM AX.25 1200bps
- FASTRAC-2 "Emma" 145.825 MHz FM AX.25 1200bps
- RAX-1 437.505 MHz
- O/OREOS 437.305 MHz
- Nanosail D2 0.5 sec beacon every 5 sec on 437.275 MHz.

RAX Facebook: http://www.facebook.com/pages/RAX-Ra...68658456492859
RAX Twitter: http://twitter.com/RAX_2010

FASTRAC Facebook http://www.facebook.com/fastracsats
FASTRAC Twitter http://www.twitter.com/fastracsats/

O/OREOS http://www.crestnrp.org

NanoSail-D2 http://nanosaild.engr.scu.edu/dashboard.htm

Amateur radio operators - help track the FASTRAC satellites
http://www.southgatearc.org/news/nov...c_tracking.htm

AMSAT Bulletin Board (AMSAT-BB)
http://www.amsat.org/amsat-new/tools/maillist/

Orbiter Forum
http://www.orbiter-forum.com/showthread.php?p=219924


Source : QRZ Forums

Wednesday, June 16, 2010

A close up of Doppler Shift

My searches about Soppler Effect on Doppler scenarios for low Earth orbiting satellite operation reaches here..

Many amateurs have been confused by the Doppler shift encountered during satellite operation. In essence, Doppler shift is simply the apparent change in frequency that is observed when an object moves towards or away from an observer. It is a property common to wave propagation. Almost everyone has experienced Doppler shift in everyday life. Here's a couple of common examples: