Friday 15 May, the 5,7 GHz OZ7IGY beacon has been migrated to the Next Generation Beacons platform
http://www.rudius.net/oz2m/ngnbThe 5,7 GHz beacon is now frequency and time locked to GPS. The sequence is timed to start at 00 second sending PI4 followed by a short pause then CW ID sending callsign and locator, then pause and carrier until next cycle. The nominal frequency remains the same, i.e. 5760,930 MHz.
To decode PI4 tune your receiver to 800 Hz below the nominal frequency, just like you do when you want to decode a normal CW signal at 800 Hz.
On most radios this is a USB dial of 5.760.929.020. The antenna now is an omnidirectional wave guide slot.
PI4 is a digital modulation (MGM) specifically designed with beacons and propagation studies in mind.
PI4 decoder download:
http://www.rudius.net/oz2m/software/pi-rxPI4 encoding examples in Arduino C, Atmel C, Delphi Pascal, Microsoft Visual Basic and Microsoft C++:
http://www.rudius.net/oz2m/ngnb/software.htmPI4 online encoding and frequency calculation:
http://www.rudius.net/oz2m/ngnb/pi4encoding.phpPI4 specification:
http://www.rudius.net/oz2m/ngnb/pi4.htm PI4 is a cousin of JT4, JT9 and WSPR.
OZ7IGY homepage:
http://www.oz7igy.dk73
Bo, OZ2M
