'\" t .\" Title: jt65code .\" Author: [see the "AUTHOR" section] .\" Generator: DocBook XSL Stylesheets v1.79.1 .\" Date: 02/20/2021 .\" Manual: WSJT-X Manual .\" Source: AsciiDoc 2.3.0 .\" Language: English .\" .TH "JT65CODE" "1" "02/20/2021" "AsciiDoc 2\&.3\&.0" "WSJT\-X Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" jt65code, jt9code, jt4code, qra64code, ft8code, msk144code \- Weak signal communications encoding support utilities\&. .SH "SYNOPSIS" .sp \fBjt65code\fR "\fIMESSAGE\fR" .sp \fBjt65code\fR [\fIOPTIONS\fR] .sp \fBjt9code\fR "\fIMESSAGE\fR" .sp \fBjt9code\fR [\fIOPTIONS\fR] .sp \fBjt4code\fR "\fIMESSAGE\fR" .sp \fBjt4code\fR [\fIOPTIONS\fR] .sp \fBqra64code\fR "\fIMESSAGE\fR" .sp \fBqra64code\fR [\fIOPTIONS\fR] .sp \fBft8code\fR "\fIMESSAGE\fR" .sp \fBft8code\fR [\fIOPTIONS\fR] .SH "OPTIONS" .PP \fB\-t\fR .RS 4 Prints a selection of messages alongside their corresponding decoded form and types\&. With \fBft8code\fR prints a selection of short format messages .RE .PP \fB\-T\fR .RS 4 As \fB\-T\fR but for \fBft8code\fR prints long format messages\&. .RE .SH "DESCRIPTION" .sp \fBjt65code\fR, \fBjt9code\fR, \fBjt4code\fR, and \fBft8code\fR are utility programs that let you explore the conversion of user\-level messages into channel symbols or \(lqtone numbers\&.\(rq 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\&. .sp 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: .sp .if n \{\ .RS 4 .\} .nf $ 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 .fi .if n \{\ .RE .\} .sp 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\&. .sp 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: .sp .if n \{\ .RS 4 .\} .nf $ 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 .fi .if n \{\ .RE .\} .sp 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: .sp .if n \{\ .RS 4 .\} .nf $ 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 .fi .if n \{\ .RE .\} .sp 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\&. .sp .if n \{\ .RS 4 .\} .nf $ 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 .fi .if n \{\ .RE .\} .sp .if n \{\ .RS 4 .\} .nf $ msk144code "G0XYZ K1ABC FN43" Message Decoded Err i3\&.n3 \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 1\&. G0XYZ K1ABC FN43 G0XYZ K1ABC FN43 1\&. Standard msg Channel symbols 110000110100110001010010011100110010010110000011011001001100001101111010 110010110111111100001101001111000111101011111011100001110000011101110110 .fi .if n \{\ .RE .\} .sp .if n \{\ .RS 4 .\} .nf $ 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 .fi .if n \{\ .RE .\} .PP WSJT\-X home page .RS 4 https://www\&.physics\&.princeton\&.edu/pulsar/K1JT/wsjtx\&.html .RE .PP WSJT\-X User\(cqs Guide .RS 4 https://www\&.physics\&.princeton\&.edu/pulsar/K1JT/wsjtx\-doc/wsjtx\-main\-2\&.3\&.0\&.html .RE .SH "AUTHOR" .sp Joe Taylor, K1JT\&. .SH "COPYING" .sp \fBjt65code\fR, \fBjt9code\fR, \fBjt4code\fR, and \fBft8code\fR are Copyright \(co 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)\&. .sp 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\&.