HSMS%20med%20WSJT

1
HSMS med WSJT
OZ1PIF, Peter Frenning EDR Roskilde Afd. Torsdag
den 29. November 2001
2
Hvad er WSJT?

• Weak Signal by k1JT
• K1JT Joe Taylor, Professor i Astrofysik ved
  Princeton Universitetet i USA. Nobelpris i Fysik
  1993 for opdagelsen af Pulsarer ved hjælp af
  Radioteleskopet i Arecaibo.

3
Hvorfor køre HSMS?

• På 144MHz
• Tropo op til ca 8-900Km
• ES sjældent under 2000Km
• AU sjældent over 1200Km
• MS 600-2000Km!
• På 50MHz
• Uinteressant, afstande allerede dækket ind af ES
• På 432Hz
• Nye muligheder at udforske!

4
Hvorfor køre HSMS?(Størrelsen GØR en forskel!)
5

• JUST HOW FAST IS HSCW?
• IS IT MUCH FASTER THAN SSB?
• Here are some examples
• (lpm wpm x 5) lpm, letters per
  minute wpm, words per minute.
• Typical CW 25 wpm 125 lpm
• Fast CW 50 wpm 250 lpm (Limit of
  most "regular speed" MS operation
  )
• SSB 250 wpm 1250 lpm
• Slow HSCW 300 wpm 1500 lpm
• Kinda slow HSCW 400 wpm 2000 lpm (used
  for CQ's in North America)
• Faster HSCW 800 wpm 4000 lpm (common
  schedule speed in North America)
• Still faster HSCW 1200 wpm 6000 lpm (used
  for many skeds now)
• Very fast HSCW 1600 wpm 8000 lpm
• Ultra fast HSCW 3200 wpm 16,000 lpm (not
  recommended, S/N Ratio bad. But
  has been done!)
• You can see that even slow HSCW is as fast as
  most SSB operators can talk, except maybe for
  those whose occupation is auctioneering! And
  receiver tuning and signal strength requirements
  are not as tight.

6

• SO JUST HOW SHORT CAN THESE PINGS BE AND STILL
  GET USABLE INFORMATION ACROSS?
• Very short! In fact, for HSCW, pings or bursts
  longer than two or three seconds are exciting but
  are almost a nuisance! We'll leave it up to you
  do the actual math. But a 1/10th second ping can
  propagate a complete set of calls at the medium
  or higher speeds! This might produce a full
  syllable on SSB!
•  
• YOU CAN'T COPY THAT BY EAR! AND THE CW DECODERS
  I'VE SEEN COULDN'T HANDLE ANYTHING LIKE THIS.
  HOW DO YOU DO IT?
• Right. The idea is simple. Use a device to slow
  the code down to something readable. Then copy
  by ear what has come through.

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FSK441

• Frequency shift keying _at_ 441BAUD
• 4 Toner
• 882, 1323, 1764 og 2205 Hz
• Hvert tegn kræver 3 toneintervaller, dvs.
  3/441sek. (Ca 2.3ms) for afsendelse
• Max 48 forskellige tegn, 43 i brug, samme som i
  PUA-43 alfabetet.

13
Indkodning

• The present encoding of each character is defined
  in the table below.
• The four tones are labeled 0-3 for the tones 882
  through 2205 Hz, in
• increasing order. The four possible
  "single-tone" encodings, namely
• 000, 111, 222, and 333, are reserved in WSJT for
  special use as
• shorthand messages. (These characters sent
  repeatedly amount to pure
• single-frequency carriers, and their pings are
  easily recognized by
• the software and by the human ear.) The present
  definition of the
• shorthand messages is respectively "R26", "R27",
  "RRR", and "73".
• These messages are very widely used in North
  American HSMS
• communications.

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14 032 15 033
ltSpacegt 16 100 17
101 A 18 102 B 19
103 C 20 110 D 21
111 reserved 22 112 F
23 113 G 24 120 H
25 121 I 26 122 J
27 123 K 28 130 L
29 131 M 30 132 N
31 133 O
32 200 P 33 201
Q 34 202 R 35 203
S 36 210 T 37 211
U 38 212 V 39 213
W 40 220 X 41 221
Y 42 222 reserved 43
223 0 44 230 E 45
231 Z 46 232 47
233 ... 63 333 reserved

• Character Tones
• Number sent Character
• --------------------------
• 0 000 reserved
• 1 001 1
• 2 002 2
• 3 003 3
• 4 010 4
• 5 011 5
• 6 012 6
• 7 013 7
• 8 020 8
• 9 021 9
• 10 022 .
• 11 023 ,
• 12 030 ?
• 13 031 /

15
En random QSO

• 222000 26.5 60 10 16 109 IK1MTZ CQ4
  5 10 0 3 0
• 222100 3.4 60 8 16 109 CY IK1MTZ
  0 8 5 0 0
• 222100 13.1 80 12 17 109 TZ CQ IK1MTZ
  4 9 0 8 0
• 222200 6.8 180 8 26 109 K1MTZ R26 R26
  OZ1PIF IK1MTZ 4 5 2 1 0
• 222200 10.7 100 12 17 109 26 OZ1PIF IK1MTS
  8 9 4 7 0
• 222200 12.4 80 8 16 109 26 OZ1PIF?IK
  0 0 7 1 0
• 222200 26.2 80 9 16 109 1PIF IK1MTU R
  4 11 4 5 0
• 222200 26.8 40 5 16 109 OZ1PIG6
  8 9 3 6 0
• 222300 1.2 280 11 27 109 6 R26 OZ1PIF
  IK1MTZ R263R26 OZ1PIF II1/E 7 3 2 4 0
• 222300 11.3 60 9 16 109 Z1PIF IK1M
  10 13 7 2 0
• 222300 18.8 180 16 27 109 OZ PIF IK1MTZ R26
  R26 OZ1XIF 1 9 5 5 0
• 222300 23.8 80 15 17 109 F IK1MTZ R26
  4 10 6 3 0
• 222400 2.5 360 13 27 109 IK1MTZ R26 R26
  OZ1PIF IK1MTZ R26 R26 OZ1 7 9 4 4 0
• 222400 3.1 60 6 16 109 IF IK1MTZ
  3 11 8 2 0
• 222400 6.4 300 14 27 109 Z1PIF IK1MTZ R26
  R26 OZ1PIF IK1 TZ R26 6 9 4 4 0
• 222400 10.6 40 6 16 109 OZ1PIF
  7 7 0 8 0
• 222400 13.5 120 7 26 109 Z R26 R26 OZ1PIF
  IH 7 0 5 2 0
• 222400 17.5 160 6 26 109 IF IK1MTZ R26 R26
  OZ1XIF 1 7 1 0 0
• 222500 6.5 140 11 27 109 IK1MTQ RRR
  JN35UB GZ/ 5 8 2 3 0

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Krævede signal niveauer

• The first column gives the necessary signal level
  in dB, relative to the noise power in a 2500 Hz
  passband, for communication or signal detection
  by each mode.  The entriesare ordered by
  increasing sensitivity of the mode the
  fartherdown this list, the better the mode is,
  in terms of signal-to-noise ratio.  (Actual
  communication throughput rates vary rather
  widely, of course.)

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Krævede signal niveauer

• SignalLevel (dB) Mode Other
  details------------------------------------------
  ---------------------- 8.1 HSCW Single dit at
  10k LPM 7.0 HSCW Single dit at 6k LPM 6.0
  SSB Voice, very weak but readable 5.2 HSCW
  Single dah at 10k LPM 4.1 HSCW Single dah at
  6k LPM 1.5 FSK441 Multi-tone WSJT message 
  0.0 FSK441 Multi-tone WSJT folded message, 160
  ms ping, 12 characters -1.5 HSMS Underdense
  ping, 20 ms, detected in full BW -3.1 WSJT
  Single-tone message, 20 ms ping, v0.92
  decoder -5.0 HSMS Underdense ping, 100 ms,
  detected in full BW -5.9 CW 20 WPM, single
  dit, Rx bandwidth 500 Hz -6.6 WSJT Single-tone
  message, 20 ms ping, v1.0 decoder-10.4 CW 20
  WPM, single dit, Rx bandwidth 50 Hz-14.3 FSK441
  Multi-tone WSJT 12 character message, whole 30 s
                  file averaged (not implemented
  in present decoder)-14.6 WSJT Single-tone
  message, 100 ms ping (not implemented)-29.2
  PUA-43 One minute transmission, 28-char
  msg-30.9 EME-2 One minute of alternating TX/RX
  intervals, detection only-38.1 PUA-43 One
  hour, alternating TX/RX, 14 character message
  decoded-39.8 EME-2 One hour of alternating
  TX/RX intervals, detection only

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Internet Ressourcer

• http//pulsar.princeton.edu/joe/K1JT WSJT Home
  page
• http//www.vhfdx.de/wsjt EU spejl
• http//www.qsl.net/w8wn/hscw/wsjt/wsjtfaq.html
  Shelby Ennis FAQ
• http//www.qsl.net/w8wn/hscw/hscw.html Shelbys
  generelle MS sider