Antenna placement – Campbell Scientific ST-21 Argos Satellite Transmitter User Manual
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ST-21 Argos Satellite Transmitter
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successful data transmissions per satellite pass will increase with a decrease in 
the repetition rate. 
More detailed information regarding Service Argos and satellite coverage is 
available from Service Argos. On the Web, see http://www.argosinc.com/. 
The Service Argos North American office can be contacted by email at 
[email protected] or phone (301) 925-4411. 
5. Antenna Placement
The position of polar orbiting satellites relative to the PTT will change during 
the satellite pass and with each satellite pass. The antenna must broadcast 
evenly to all areas of the sky. The antenna is omnidirectional. Mount the 
antenna vertically. Choose a location with a clear view of the sky in all 
directions. Any obstruction between the PTT antenna and the sky can block 
data transmission between the satellite and the PTT.