137 MHZ QHF Quadrafilar APT Antenna
- This version of the 135mHz quadrafilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey's article Taming the QFH which appeared in the March 1997 RIG magazine.
W4JOH Cobra Antenna
- The original Cobra antenna, is a multiband 160 or 80 to 10 meter, designed by W4JOH is built using standard insulated wire of about 14 gauge and fed with 450 ohm ladder line down to the shack into a tuner.
- APRS+SA does most of the functions of the original APRS(tm) with a big difference: The maps it uses to plot the locations are Street Atlas 4.0 or 5.0 Maps. This allows great precision in locating objects and stations.
- Atpdec is an open source program that decodes images transmitted by POES NOAA weather satellite series.
These satellites transmit continuously, among other things, medium resolution images of the earth on 137Mhz.
These transmissions could be easily received with an inexpensive antenna and dedicated receiver.
For more information about receiving POES satellite images consult the rig site.