Allows real time keyboard chat between two operators. Sound of PSK31:ĩ What is RTTY? After WWII, hams began using surplus RadioTeleTYpe equipment. Uses varicode, frequently used characters are shorter than others. Bandwidth is 62.5 Hz (about the same as 25 WPM CW). PSK31 (Phase Shift Keying, 31 baud) modulates the phase of a carrier, not by using different tones, such as RTTY.Ĩ More about PSK31 Bandwidth is 62.5 Hz (about the same as 25 WPM CW). A great “ragchew” mode! Other stations see your typing immediately. Sound of JT65:ħ What is PSK31? PSK31 was developed by Peter Martinez, G3PLX, in December Allows real time keyboard chat between two operators. Accurate computer time, within two seconds, is required (more on this later). Digital signal processing and redundancy allow up to 80% of the message to be lost and still be decoded correctly.ĭuring 126 intervals of sec the waveform is one of 65 pre-defined tones.

Exchanges the minimum information needed for a QSO (Call Signs, Grid Squares, Signal Reports).

Uses 60-second sequences, (48 seconds transmit, 12 seconds decode) and structured messages. Joe Taylor, K1JT, in late 2003 for EME (earth-moon-earth) communications on VHF. Sound of FT8:ĥ What is JT65? JT65 was developed by Dr. This means decoding sometimes takes place when you hear nothing and see nothing on the waterall! Accurate computer time, within two seconds, is required (more on this later). Decoding threshold is -24 dB, sometimes lower. Waveform is continuous phase with a constant envelope. Modulation is 8-FSK, tone spacing 5.86 Hz. Multi-decoder finds and decodes all FT8 signals in the passband – not just where you have the receive marker set.

Uses 15-second sequences, (13 seconds transmit, 2 seconds decode) and structured messages. Joe Taylor, K1JT, and Bill Somerville, G4WJS, in June 2017 for weak signal communications. However, the vast majority of setup and operating principles for these modes apply to many, lesser- known modes, as well (Olivia, Hellschreiber, Contestia, MT63, etc.).ģ What is FT8? FT8 was a joint development by Steve Franke, K9AN, Dr. 2 Introduction This presentation covers station and computer setup for the popular HF ham radio digital modes FT8, JT65, PSK31, and RTTY using a soundcard.

Jt65 using ham radio deluxe