 Computer running Windows, Linux, or Mac OS.  HF Transceiver capable of SSB and monitoring of ALC  Many hams use digital modes on HF, and contacts can  PSK31 and JT65 modes work well with low power and  The software needed is free or low cost.  The equipment needed to connect your rig to aĬomputer is very modest, and can be homemade or Typically from COM port or LPT port) or AFSK (audio  RTTY can be sent using either FSK (on/off keying,  The standard mark and space tones are 2125 Hz and  At typical 45 baud each bit is 1/45.45 seconds long, or Letters of the alphabet, the numbers, some  “RTTY uses a five-bit code (Baudot) to represent all the  After WW II, hams began using surplus radioteletype  Uses varicode, frequently used characters are shorter  Bandwidth is 62.5 Hz (about the same as 25 WPM

 “PSK” Phase Shift Keying modulates the phase of a Other stations see your typing immediately.  Allows “real time” keyboard chat between two  PSK31 was developed by Peter Martinez, G3PLX in  Accurate computer time (within 2 seconds) is  During 126 intervals of 0.372 sec the waveform is one  Digital signal processing and redundancy allow up toĨ0% of the message to be lost and still be decoded QSO (Call Signs, Signal Reports, Grid Squares)  Exchanges the minimum information needed for a  JT65 uses 60 sec transmit/receive sequences and  JT65A protocol was developed by Joe Taylor, K1JT in  This presentation covers station and computer setupįor the popular HF ham radio digital modes JT65,

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