Provided by: wsjtx_2.6.1+repack-1_amd64 bug

NAME

       jt65code, jt9code, jt4code, qra64code, ft8code, msk144code - Weak signal communications
       encoding support utilities.

SYNOPSIS

       jt65code "MESSAGE"

       jt65code [OPTIONS]

       jt9code "MESSAGE"

       jt9code [OPTIONS]

       jt4code "MESSAGE"

       jt4code [OPTIONS]

       qra64code "MESSAGE"

       qra64code [OPTIONS]

       ft8code "MESSAGE"

       ft8code [OPTIONS]

OPTIONS

       -t
           Prints a selection of messages alongside their corresponding decoded form and types.
           With ft8code prints a selection of short format messages

       -T
           As -T but for ft8code prints long format messages.

DESCRIPTION

       jt65code, jt9code, jt4code, and ft8code 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 for each of the protocols.

       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, JT65 and JT4,
       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.

           $ qra64code "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
              61 36 45 30  3 55  3  2 14  5 33 41 14 28  2  7 58 45  9 43 20 48 29 55 43 24  3 13 18 21
              40  3 17 28 59 62  2 50 26 24  2  1  2 61 10  9 16 40  1 18 28 30 33 39 60 45 16 21 60 11
               9 40 14

           Channel symbols including sync
              20 50 60  0 40 10 30 61 36 45 30  3 55  3  2 14  5 33 41 14 28  2  7 58 45  9 43 20 48 29
              55 43 24  3 13 18 21 40  3 20 50 60  0 40 10 30 17 28 59 62  2 50 26 24  2  1  2 61 10  9
              16 40  1 18 28 30 33 39 60 45 16 21 60 11  9 40 14 20 50 60  0 40 10 30

           $ msk144code "G0XYZ K1ABC FN43"
               Message                               Decoded                             Err i3.n3
           ----------------------------------------------------------------------------------------------------
            1. G0XYZ K1ABC FN43                      G0XYZ K1ABC FN43                         1.  Standard msg

           Channel symbols
           110000110100110001010010011100110010010110000011011001001100001101111010
           110010110111111100001101001111000111101011111011100001110000011101110110

           $ ft8code "G0XYZ K1ABC FN43"
               Message                               Decoded                             Err i3.n3
           ----------------------------------------------------------------------------------------------------
            1. G0XYZ K1ABC FN43                      G0XYZ K1ABC FN43                         1.  Standard msg

           Source-encoded message, 77 bits:
           00001000111111010001110111010000010011011110111100011010100010100001100111001

           14-bit CRC:
           00110001001011

           83 Parity bits:
           10000110000001010101100000100110100110100000111000101110000110001001110000000110011

           Channel symbols (79 tones):
             Sync               Data               Sync               Data               Sync
           3140652 03174526450547670460602143205 3140652 64040136505454507064041140042 3140652

       WSJT-X home page
           https://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html

       WSJT-X User’s Guide
           https://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-2.6.1.html

AUTHOR

       Joe Taylor, K1JT.

COPYING

       jt65code, jt9code, jt4code, and ft8code are Copyright © 2001 - 2020 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.