Presentation to Shefford & District ARS Gareth Howell – M5KVK
Agenda <ul><li>Some background </li></ul><ul><li>New modes to be covered </li></ul><ul><li>A couple of odd-balls </li></ul>
Some Background <ul><li>Two basic families: </li></ul><ul><li>PSK </li></ul><ul><ul><ul><li>(Digital Binary Phase-Shift Ke...
New Modes to be covered <ul><li>DominoEx </li></ul><ul><li>Olivia </li></ul>
DominoEx <ul><li>Murray ZL1BPU </li></ul><ul><li>18 tone FSK </li></ul><ul><li>Designed to overcome limitations in MFSK </...
Characteristics <ul><li>Variants named after Baud rate </li></ul><ul><li>Improved tolerance to multi-path </li></ul><ul><l...
DominoEx 8 <ul><li>Used on poorer circuits (50WPM) </li></ul>
DominoEx 16 <ul><li>Higher speed, used on better circuits (100WPM) </li></ul>
Olivia <ul><li>Invented by Pavel SP9vRC </li></ul><ul><li>64-FSK - sequential </li></ul><ul><li>Multiple variants </li></u...
Characteristics <ul><li>Horses for courses </li></ul><ul><ul><li>Fewer tones mean higher speed </li></ul></ul><ul><ul><li>...
Olivia Variants <ul><li>Bandwidth/Tones </li></ul><ul><li>500/16 </li></ul><ul><ul><li>19.5 wpm </li></ul></ul><ul><ul><li...
Olivia Variants
 
Olivia 500/16
Olivia 1000/16
A couple of odd-balls <ul><li>HF-ALE </li></ul><ul><li>WSJT </li></ul>
HFLINK (ALE) <ul><li>Automatic Link Establishment (ALE) </li></ul><ul><li>Focused on emergency communications </li></ul><u...
WSJT <ul><li>JT65 </li></ul><ul><li>Very slow speed </li></ul><ul><li>Optimised for very weak signals </li></ul><ul><ul><l...
References-1 <ul><li>Domino </li></ul><ul><ul><li>DominoEX - an IFK Mode for HF  http://snurl.com/n7vwv </li></ul></ul><ul...
References-2 <ul><li>HFLINK </li></ul><ul><ul><li>http://snurl.com/n7wdh </li></ul></ul><ul><li>JT65A and WSJT </li></ul><...
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New Hf Digital Modes Sadars 2009

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Presentation on newer digital modes used on HF Amateur bands.
Presented to Shefford and District ARS June 2009

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New Hf Digital Modes Sadars 2009

  1. 1. Presentation to Shefford & District ARS Gareth Howell – M5KVK
  2. 2. Agenda <ul><li>Some background </li></ul><ul><li>New modes to be covered </li></ul><ul><li>A couple of odd-balls </li></ul>
  3. 3. Some Background <ul><li>Two basic families: </li></ul><ul><li>PSK </li></ul><ul><ul><ul><li>(Digital Binary Phase-Shift Keying) </li></ul></ul></ul><ul><ul><ul><li>PSK 31, 63, 125 etc </li></ul></ul></ul><ul><ul><ul><li>No error correction </li></ul></ul></ul><ul><ul><ul><li>Low bandwidth </li></ul></ul></ul><ul><li>MFSK </li></ul><ul><ul><ul><li>(Multi Frequency-Shift Keying) </li></ul></ul></ul><ul><ul><ul><li>RTTY, Piccolo, Coquelet </li></ul></ul></ul><ul><ul><ul><li>MFSK 4, 8, 16 (42WPM) </li></ul></ul></ul><ul><ul><ul><li>Sensitive </li></ul></ul></ul><ul><ul><ul><li>Good rejection of Doppler </li></ul></ul></ul>
  4. 4. New Modes to be covered <ul><li>DominoEx </li></ul><ul><li>Olivia </li></ul>
  5. 5. DominoEx <ul><li>Murray ZL1BPU </li></ul><ul><li>18 tone FSK </li></ul><ul><li>Designed to overcome limitations in MFSK </li></ul><ul><li>Optimised for NVIS (80/40/30m) </li></ul><ul><li>Varicode </li></ul><ul><li>Incremental Frequency Keying </li></ul><ul><ul><li>Reduces tuning sensitivity </li></ul></ul><ul><ul><li>And drift </li></ul></ul>
  6. 6. Characteristics <ul><li>Variants named after Baud rate </li></ul><ul><li>Improved tolerance to multi-path </li></ul><ul><li>Improved rejection of impulse noise </li></ul><ul><li>No need for FEC in normal use </li></ul><ul><ul><li>Higher speed than MFSK </li></ul></ul><ul><li>Shorter sync time </li></ul><ul><ul><li>i.e. faster turn around in QSO mode </li></ul></ul>
  7. 7. DominoEx 8 <ul><li>Used on poorer circuits (50WPM) </li></ul>
  8. 8. DominoEx 16 <ul><li>Higher speed, used on better circuits (100WPM) </li></ul>
  9. 9. Olivia <ul><li>Invented by Pavel SP9vRC </li></ul><ul><li>64-FSK - sequential </li></ul><ul><li>Multiple variants </li></ul><ul><ul><li>Tones and Bandwidth </li></ul></ul><ul><li>Multiple Baud rates </li></ul><ul><li>Varicode and Forward Error Correction </li></ul>
  10. 10. Characteristics <ul><li>Horses for courses </li></ul><ul><ul><li>Fewer tones mean higher speed </li></ul></ul><ul><ul><li>More tones add robustness </li></ul></ul><ul><li>Works over very poor S/N circuits </li></ul><ul><ul><li>Often not visible or audible </li></ul></ul><ul><ul><li>Voluntary channelisation </li></ul></ul>
  11. 11. Olivia Variants <ul><li>Bandwidth/Tones </li></ul><ul><li>500/16 </li></ul><ul><ul><li>19.5 wpm </li></ul></ul><ul><ul><li>Used for CQ and QSOs in average conditions </li></ul></ul><ul><li>1000/32 </li></ul><ul><ul><li>24.4 wpm </li></ul></ul><ul><ul><li>Used for CQ and QSOs in average conditions </li></ul></ul><ul><li>500/8 </li></ul><ul><ul><li>29.3 WPM </li></ul></ul><ul><ul><li>QSOs on higher bands </li></ul></ul><ul><li>1000/16 </li></ul><ul><li>500/4 </li></ul><ul><li>250/8 </li></ul>
  12. 12. Olivia Variants
  13. 14. Olivia 500/16
  14. 15. Olivia 1000/16
  15. 16. A couple of odd-balls <ul><li>HF-ALE </li></ul><ul><li>WSJT </li></ul>
  16. 17. HFLINK (ALE) <ul><li>Automatic Link Establishment (ALE) </li></ul><ul><li>Focused on emergency communications </li></ul><ul><li>Permanent Global network </li></ul><ul><ul><li>24x7 on 8 HF bands </li></ul></ul><ul><li>MIL-STD-188-141A </li></ul><ul><ul><li>SSB/Text/SMS/Internet </li></ul></ul><ul><ul><li>Scanning </li></ul></ul><ul><ul><li>Sounding </li></ul></ul>
  17. 18. WSJT <ul><li>JT65 </li></ul><ul><li>Very slow speed </li></ul><ul><li>Optimised for very weak signals </li></ul><ul><ul><li>Troposcatter/EME/ </li></ul></ul><ul><li>65-MFSK, FEC </li></ul><ul><li>JT65-HF variant for HF </li></ul>
  18. 19. References-1 <ul><li>Domino </li></ul><ul><ul><li>DominoEX - an IFK Mode for HF http://snurl.com/n7vwv </li></ul></ul><ul><li>Olivia </li></ul><ul><ul><li>WB8ROL Olivia Digital Mode Information Page http://snurl.com/n7vqz </li></ul></ul><ul><ul><li>The International Olivia Digital Mode Group http://snurl.com/n7vso </li></ul></ul><ul><ul><li>Olivia Frequencies http://snurl.com/n7vze </li></ul></ul>
  19. 20. References-2 <ul><li>HFLINK </li></ul><ul><ul><li>http://snurl.com/n7wdh </li></ul></ul><ul><li>JT65A and WSJT </li></ul><ul><ul><li>The Complete Bozo's Guide to HF JT65A http://snurl.com/n7w4z </li></ul></ul><ul><li>Scheds </li></ul><ul><ul><li>http://snurl.com/n7vv8 </li></ul></ul>
  20. 21. Questions ??

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