1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// Status=review
The _WSJT-X_ packages include program *+rigctl-jtdx[.exe]+*, which
can be used to send CAT sequences to a rig from the command line, or
from a batch file or shell script; and program *+rigctld-jtdx[.exe]+*,
which allows other compatible applications to share a CAT connection
to a rig. These program versions include the latest Hamlib rig
drivers -- the same ones used by _WSJT-X_ itself.
Additional utility programs *+jt4code+*, *+jt9code+*, and *+jt65code+*
let you explore the conversion of user-level messages into channel
symbols or "`tone numbers,`" and back again. These programs can be
useful to someone designing a beacon generator, for understanding the
permissible structure of transmitted messages, and for studying
behavior of the error-control codes.
Channel-symbol values for JT4 run from 0 to 3. The total number of
symbols in a transmitted message is 206. To run +jt4code+, enter the
program name followed by a JT4 message enclosed in quotes. In Windows
the command and program output might look like this:
C:\WSJTX> jt4code "G0XYZ K1ABC FN42"
Message Decoded Err? Type
-------------------------------------------------------------------
1. G0XYZ K1ABC FN42 G0XYZ K1ABC FN42 1: Std Msg
Channel symbols
2 0 0 1 3 2 0 2 3 1 0 3 3 2 2 1 2 1 0 0 0 2 0 0 2 1 1 2 0 0
2 0 2 0 2 0 2 0 2 3 0 3 1 0 3 1 0 3 0 1 1 1 1 1 0 1 0 0 2 3
2 2 3 0 2 1 3 3 3 3 2 0 2 1 2 3 0 0 2 3 1 1 1 0 3 1 2 0 3 2
0 2 3 3 0 1 2 1 2 1 0 1 0 1 1 1 1 3 0 3 0 3 2 3 3 0 3 0 1 0
3 3 3 0 0 3 2 1 3 2 3 1 3 3 2 2 0 2 3 3 2 1 1 0 2 2 3 3 1 2
3 1 1 2 1 1 1 0 2 1 2 0 2 3 1 2 3 1 2 2 1 2 0 0 3 3 1 1 1 1
2 0 3 3 0 2 2 2 3 3 0 0 0 1 2 3 3 2 1 1 1 3 2 3 0 3
Channel-symbol values for JT9 run from 0 to 8, with 0 representing the
sync tone. The total number of symbols in a transmitted message is
85. Enter the program name followed by a JT9 message enclosed in
quotes:
C:\WSJTX> jt9code "G0XYZ K1ABC FN42"
Message Decoded Err? Type
-------------------------------------------------------------------
1. G0XYZ K1ABC FN42 G0XYZ K1ABC FN42 1: Std Msg
Channel symbols
0 0 7 3 0 3 2 5 4 0 1 7 7 7 8 0 4 8 8 2 2 1 0 1 1 3 5 4 5 6
8 7 0 6 0 1 8 3 3 7 8 1 1 2 4 5 8 1 5 2 0 0 8 6 0 5 8 5 1 0
5 8 7 7 2 0 4 6 6 6 7 6 0 1 8 8 5 7 2 5 1 5 0 4 0
For the corresponding program *+jt65code+* only the
information-carrying channel symbols are shown, and the symbol values
range from 0 to 63. Sync symbols lie two tone intervals below data
tone 0, and the sequential locations of sync symbols are described in
the <<JT65PRO,JT65 Protocol>> section of this Guide.
A typical execution of +jt65code+ is shown below. The program
displays the packed message of 72 bits, shown here as 12 six-bit
symbol values, followed by the channel symbols:
C:\WSJTX> jt65code "G0XYZ K1ABC FN42"
Message Decoded Err? Type
----------------------------------------------------------------------
1. G0XYZ K1ABC FN42 G0XYZ K1ABC FN42 1: Std Msg
Packed message, 6-bit symbols 61 36 45 30 3 55 3 2 14 5 33 40
Information-carrying channel symbols
56 40 8 40 51 47 50 34 44 53 22 53 28 31 13 60 46 2 14 58 43
41 58 35 8 35 3 24 1 21 41 43 0 25 54 9 41 54 7 25 21 9
62 59 7 43 31 21 57 13 59 41 17 49 19 54 21 39 33 42 18 2 60
For an illustration of the power of the strong error-control coding in
JT9 and JT65, try looking at the channel symbols after changing a
single character in the message. For example, change the grid locator
from +FN42+ to +FN43+ in the JT65 message:
C:\Users\joe\wsjt\wsjtx_install>jt65code "G0XYZ K1ABC FN43"
Message Decoded Err? Type
----------------------------------------------------------------------
1. G0XYZ K1ABC FN43 G0XYZ K1ABC FN43 1: Std Msg
Packed message, 6-bit symbols 61 36 45 30 3 55 3 2 14 5 33 41
Information-carrying channel symbols
25 35 47 8 13 9 61 40 44 9 51 6 8 40 38 34 8 2 21 23 30
51 32 56 39 35 3 50 48 30 8 5 40 18 54 9 24 30 26 61 23 11
3 59 7 7 39 1 25 24 4 50 17 49 52 19 34 7 4 34 61 2 61
You will discover that every possible JT65 message differs from every
other possible JT65 message in at least 52 of the 63
information-carrying channel symbols.
|
