WSJT-X/lib/jt65code.f90
Joe Taylor 4c00ea666a 1. Add "Utility Programs" section to User's Guide.
2. Change "Appendix x" section headings to useful descriptions.
3. Add KB1ZMX and W4TI to the WSJT-X "About" screen and Acknowledgments 
   in the User's Guide.  (Hope I didn't forget anyone -- please advise 
   if I did!)
4. A few more minor tweaks to User's Guide



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3672 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2014-01-30 18:03:21 +00:00

50 lines
1.6 KiB
Fortran

program JT65code
! Provides examples of message packing, bit and symbol ordering,
! Reed Solomon encoding, and other necessary details of the JT65
! protocol.
character*22 msg0,msg,decoded,cok*3
integer dgen(12),sent(63),recd(12),era(51)
logical text
nargs=iargc()
if(nargs.ne.1) then
print*,'Usage: JT65code "message"'
go to 999
endif
call getarg(1,msg0) !Get message from command line
msg=msg0
call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
if(nspecial.gt.0) then !or is a shorthand message
write(*,1010)
1010 format('Shorthand message.')
go to 999
endif
call packmsg(msg,dgen,text) !Pack message into 12 six-bit bytes
write(*,1020) msg0
1020 format('Message: ',a22) !Echo input message
if(iand(dgen(10),8).ne.0) write(*,1030) !Is plain text bit set?
1030 format('Plain text.')
write(*,1040) dgen
1040 format('Packed message, 6-bit symbols: ',12i3) !Display packed symbols
call rs_encode(dgen,sent) !RS encode
call interleave63(sent,1) !Interleave channel symbols
call graycode(sent,63,1,sent) !Apply Gray code
write(*,1050) sent
1050 format('Information-carrying channel symbols:'/(i5,20i3))
call graycode(sent,63,-1,sent)
call interleave63(sent,-1)
call rs_decode(sent,era,0,recd,nerr)
call unpackmsg(recd,decoded) !Unpack the user message
write(*,1060) decoded,cok
1060 format('Decoded message: ',a22,2x,a3)
999 end program JT65code