mirror of https://github.com/saitohirga/WSJT-X.git
105 lines
3.4 KiB
Plaintext
105 lines
3.4 KiB
Plaintext
:doctype: manpage
|
|
:man source: AsciiDoc
|
|
:man version: {revnumber}
|
|
:man manual: WSJT-X Manual
|
|
= jt65code(1)
|
|
|
|
== NAME
|
|
|
|
jt65code, jt9code - Weak signal communications encoding support utility.
|
|
|
|
== SYNOPSIS
|
|
|
|
*jt65code* MESSAGE
|
|
|
|
*jt9code* MESSAGE
|
|
|
|
== DESCRIPTION
|
|
|
|
*jt65code* and *jt9code* are utility programs that let you explore the
|
|
conversion of user-level messages into channel symbols or “tone
|
|
numbers.” These programs can be useful to someone designing a beacon
|
|
generator for JT9 or JT65, or for studying behavior of the
|
|
error-control codes.
|
|
|
|
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. To run jt9code, enter the program name followed by a JT9 message
|
|
enclosed in quotes. In Windows the command and program output might
|
|
look like this:
|
|
|
|
.....
|
|
$ jt9code "G0XYZ K1ABC FN42"
|
|
Message: G0XYZ K1ABC FN42
|
|
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
|
|
Decoded message: G0XYZ K1ABC FN42
|
|
.....
|
|
|
|
For the corresponding program jt65code only the information-carrying
|
|
channel symbols are shown, and the symbol values range from 0 to
|
|
63. Sync synbols lie two tone intervals below data tone 0, and the
|
|
sequential locations of sync symbols are described in the 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:
|
|
|
|
.....
|
|
$ jt65code "G0XYZ K1ABC FN42"
|
|
Message: G0XYZ K1ABC FN42
|
|
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
|
|
Decoded message: G0XYZ K1ABC FN42
|
|
.....
|
|
|
|
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 locater
|
|
from FN42 to FN43 in the JT65 message:
|
|
|
|
.....
|
|
$ jt65code "G0XYZ K1ABC FN43"
|
|
Message: G0XYZ K1ABC FN43
|
|
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
|
|
Decoded message: G0XYZ K1ABC FN43
|
|
.....
|
|
|
|
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.
|
|
|
|
WSJT-X home page:: http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html
|
|
|
|
WSJT-X User's Guide:: http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main.html
|
|
|
|
== OPTIONS
|
|
|
|
== FILES
|
|
|
|
== AUTHOR
|
|
|
|
Joe Taylor, K1JT.
|
|
|
|
== COPYING
|
|
|
|
*jt65code* and *jt9code* are Copyright (C) 2001 - 2014 by Joseph
|
|
H. Taylor, Jr., K1JT, with contributions from additional authors.
|
|
WSJT-X is Open Source software, licensed under the GNU General Public
|
|
License (GPLv3).
|
|
|
|
These programs are distributed in the hope that they will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|