The air, and to allow ham software to use computer An external USB sound card or second internal soundĬard is recommended to avoid sending OS sounds over For Windows a minimum 1.5 GHz dual core processor Unified Microsystems Sound Card Interface Kit Optional hardware: CAT (computer aided transceiver Software (free or low cost software is available). HF antenna (simple wire antenna or vertical is fine). Generated using AFSK (audio frequency shift keying). Transceiver (can be homemade, and some rigs such as Soundcard Interface between the computer and the 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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