WSJT-X/lib/genqra64.f90

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subroutine genqra64(msg0,ichk,msgsent,itone,itype)
! Encodes a QRA64 message to yield itone(1:84) or a QRA65 msg, itone(1:85)
use packjt
character*22 msg0
character*22 message !Message to be generated
character*22 msgsent !Message as it will be received
integer itone(85) !QRA64 uses only 84
character*3 cok !' ' or 'OOO'
integer dgen(13)
integer sent(63)
integer isync(22)
integer icos7(0:6)
data icos7/2,5,6,0,4,1,3/ !Defines a 7x7 Costas array
data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
save
if(msg0(1:1).eq.'@') then
read(msg0(2:5),*,end=1,err=1) nfreq
go to 2
1 nfreq=1000
2 itone(1)=nfreq
write(msgsent,1000) nfreq
1000 format(i5,' Hz')
else
message=msg0
do i=1,22
if(ichar(message(i:i)).eq.0) then
message(i:)=' '
exit
endif
enddo
do i=1,22 !Strip leading blanks
if(message(1:1).ne.' ') exit
message=message(i+1:)
enddo
call chkmsg(message,cok,nspecial,flip)
call packmsg(message,dgen,itype) !Pack message into 72 bits
call unpackmsg(dgen,msgsent) !Unpack to get message sent
if(ichk.eq.1) go to 999 !Return if checking only
call qra64_enc(dgen,sent) !Encode using QRA64
if(ichk.eq.65) then
! Experimental QRA65 mode
j=1
k=0
do i=1,85
if(i.eq.isync(j)) then
j=j+1 !Index for next sync symbol
itone(i)=0 !Insert a sync symbol
else
k=k+1
itone(i)=sent(k) + 1
endif
enddo
else
! Original QRA64 mode
itone(1:7)=10*icos7 !Insert 7x7 Costas array in 3 places
itone(8:39)=sent(1:32)
itone(40:46)=10*icos7
itone(47:77)=sent(33:63)
itone(78:84)=10*icos7
endif
endif
999 return
end subroutine genqra64