22 July 2010
Phase Shift Keying (PSK)
The PSK31 mode uses a transmission speed of 31.25 baud using varicode caracter coding what provides a speed of 50 words per minute (very few people can type faster than this). The varicode character set has varying data lengths for each character with the most commonly used letters having the shortest data length.
Instead of using FSK (Frequency Shift Keying) or on/off keying uses BPSK (Binary Phase Shift Keying) or QPSK (Quad Phase Shift Keying). The mode uses advanced DSP and narrow band techniques. A BPSK-31 signal, when properly driven occupies about 31 Hz bandwidth! Other common formats are PSK63 and PSK125, obviously the higher the data rate, the wider the bandwidth and the less reliable under noisy or poor conditions.
Click HERE to visit the DigiPan "Digital Panoramic Tuning" web site and download the Digipan software for PSK operation.
EPC PSK signals are commonplace around 7.035 MHz, 14.070 MHz and 28.120 MHz. Even when band conditions are very poor. One of the main advantages of PSK31 is that the mode is very effective when signals are extremely weak (even with QRM)! Because of the narrowband DSP technology used, most software will allow the user to monitor two or more QSO's simultaneously without having to change frequency on the rig.
Southgate Amateur Radio Club RSS Feed
Radio Society of Great Britain - Main Site
American Radio Relay League | Ham Radio Association and Resources
10 metres 10 MHz 17 metres 20 metres 28.265 MHz 28 MHz 2 metres 30 metres 40 metres 4 metres 500 kHz 50 MHz 6 metres 70 centimetres 70 MHz 7 MHz Aeronautical Mobile Aircraft Amateur Radio American Radio Relay League Antenna AREN ATV Bandplan BBC Beacon Broadcast Christmas Coastguard Codec computing Comreg Copper Coast coronal mass ejection CW DAB De Forest Digital digital modes Digital radio Digital Signal Processing Digital Voice D-Star DX DXCC Earth Leakage Eavesdropping EI0MAR EI2GEO EI7IS Emergency Communications Engineers Ireland EPC eZine FM FSK FT-101ZD G4ILO GB6GEO Geminids Geopark Google Earth hacking HAM-MAG Hellschreiber Helvick Head HF Howth Martello Tower IARU Icom interference International Amateur Radio Union Internet Radio Ionosphere Irish Radio Transmitters Society IRLP ISS James Van Allen LF licence Linux Long Wave Low-band MAI-75 Malin Head Marconi Marine Martello Tower Mast MEPT_JT meteor meteor scatter meteor shower military minima Mobile phone Morse Code Mt. Leinster narrowband Netherlands Antilles Numbers Stations Open Source operating procedure Perseids pirate radio PMR Practical Wireless propagation PS/2 PSK QRP QRSS QSL QSO365 radar Radio 4 Radio Society of Great Britain Radiotelegraphy Rally Repeater Rescue RF pollution RTE Satellite security Shortwave Simplexer Social Networking software Solar South Eastern Amateur Radio Group Southern Ireland Repeater Network spaceweather Special Event Station SSTV Sunspot Swift Tuttle SWL Telemetry Tetra theory UHF Valentia Van Allen Belt VHF Vintage Radio Weak Signal Weather Station Wired magazine WSJT WSPR YouTube