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INTRODUCTION TO DIGITAL MODES

Creede Lambard, WA7KPK Mercury Northwest November 2012. INTRODUCTION TO DIGITAL MODES. What is a digital mode?. What is a digital mode?. Any amateur radio mode that can or must be received, presented, encoded and transmitted by the use of a computer or other dedicated digital device.

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INTRODUCTION TO DIGITAL MODES

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  1. Creede Lambard, WA7KPK Mercury Northwest November 2012 INTRODUCTION TO DIGITAL MODES

  2. What is a digital mode?

  3. What is a digital mode? • Any amateur radio mode that can or must be received, presented, encoded and transmitted by the use of a computer or other dedicated digital device.

  4. The first digital mode

  5. The first digital mode • Morse code!

  6. The first digital mode • Morse code!

  7. The first digital mode • Morse code • CW

  8. The first digital mode • Morse code • CW • Frequency-Shift Keying (FSK)

  9. Radioteletype (RTTY)

  10. Radioteletype (RTTY) • Developed when AM was king

  11. Radioteletype (RTTY) • Developed when AM was king • War surplus Teletype machines

  12. Radioteletype (RTTY) • Developed when AM was king • War surplus Teletype machines • Uses FSK on both sidebands

  13. Radioteletype (RTTY) • Developed when AM was king • War surplus Teletype machines • Uses FSK on both sidebands • Uses Baudot encoding (5 bits)

  14. Packet Radio

  15. Packet Radio • Sort of an “internet via amateur radio”

  16. Packet Radio • Sort of an “internet via amateur radio” • First became feasible in 1980 when the FCC allowed transmission of ASCII via ham radio

  17. Packet Radio • Sort of an “internet via amateur radio” • First became feasible in 1980 when the FCC allowed transmission of ASCII via ham radio • Primarily uses dedicated equipment for communication (TNC)

  18. Packet Radio • Sort of an “internet via amateur radio” • First became feasible in 1980 when the FCC allowed transmission of ASCII via ham radio • Primarily uses dedicated equipment for communication (TNC) • Does error correcting

  19. Personal Computers & Sound Cards

  20. Personal Computers & Sound Cards • RTTY modem software developed for PC

  21. Personal Computers & Sound Cards • RTTY modem software developed for PC • PC software emulating a TNC is available

  22. Personal Computers & Sound Cards • RTTY modem software developed for PC • PC software emulating a TNC is available • Research on creating narrow-bandwidth PC-based modes

  23. Personal Computers & Sound Cards • RTTY modem software developed for PC • PC software emulating a TNC is available • Research on creating narrow-bandwidth PC-based modes • FCC allows ASCII transmission

  24. Personal Computers & Sound Cards • RTTY modem software developed for PC • PC software emulating a TNC is available • Research on creating narrow-bandwidth PC-based modes • FCC allows ASCII transmission • FCC allows other encodings provided they are published into the public domain

  25. PSK-31

  26. PSK-31 • Created by Peter Martinez (G3PLX) in 1998

  27. PSK-31 • Created by Peter Martinez (G3PLX) in 1998 • Stands for “phase shift keying”

  28. PSK-31 • Created by Peter Martinez (G3PLX) in 1998 • Stands for “phase shift keying” • Bandwidth: 31 hz

  29. PSK-31 • Created by Peter Martinez (G3PLX) in 1998 • Stands for “phase shift keying” • Bandwidth: 31 hz • 80-90 QSOs in the width of a typical SSB signal

  30. PSK-31

  31. PSK-31 • Created by Peter Martinez (G3PLX) in 1998 • Stands for “phase shift keying” • Bandwidth: 31 hz • 80-90 QSOs in the width of a typical SSB signal • Does not do error correcting

  32. Other Digital Modes

  33. Other Digital Modes • Drinking from the firehose!

  34. Other Digital Modes • Olivia MFSK

  35. Other Digital Modes • Olivia MFSK • Developed by Pavel Jalocha (SP9VRC), 2003 • Named after his daughter

  36. Other Digital Modes • Olivia MFSK

  37. Other Digital Modes • Olivia MFSK • Developed by Pavel Jalocha (SP9VRC), 2003 • Named after his daughter • FEC enabled

  38. Other Digital Modes • Olivia MFSK • Developed by Pavel Jalocha (SP9VRC), 2003 • Named after his daughter • FEC enabled • Can be decoded even when below the noise floor

  39. Other Digital Modes • MT63

  40. Other Digital Modes • MT63 • Also developed by Jalocha • Similar in some ways to Olivia

  41. Other Digital Modes • MT63 • Also developed by Jalocha • Similar in some ways to Olivia • Used for emergency communications due to robust FEC

  42. Other Digital Modes • Several other modes • DominoEX • Thor • Throb • Hellschreiber

  43. JT65

  44. JT65 • “Music Box” mode

  45. JT65 • Developed by Joe Taylor, K1JT

  46. JT65 • Developed by Joe Taylor, K1JT • Also chair of astrophysics department at Princeton

  47. JT65 • Developed by Joe Taylor, K1JT • Also chair of astrophysics department at Princeton • Also Nobel Prize laureate in physics

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