WSJT-X/lib/qra/q65/genq65.f90

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2020-10-28 13:38:06 -04:00
subroutine genq65(msg0,ichk,msgsent,itone,i3,n3)
! Encodes a Q65 message to yield itone(1:85)
use packjt77
character*37 msg0 !Message to be generated
character*37 msgsent !Message as it will be received
character*77 c77
logical unpk77_success
integer itone(85) !QRA64 uses only 84
integer dgen(13)
integer sent(63)
integer isync(22)
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')
goto 999
endif
i3=-1
n3=-1
call pack77(msg0,i3,n3,c77)
call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
read(c77,1001) dgen
1001 format(12b6.6,b5.5)
dgen(13)=2*dgen(13) !Convert 77-bit to 78-bit payload
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if(ichk.eq.1) go to 999 !Return if checking only
call q65_enc(dgen,sent) !Encode message, dgen(1:13) ==> sent(1:63)
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 sync symbol at tone 0
else
k=k+1
itone(i)=sent(k) + 1 !Q65 symbol=0 is transmitted at tone 1, etc.
endif
enddo
999 return
end subroutine genq65