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52 lines
1.4 KiB
Fortran
52 lines
1.4 KiB
Fortran
subroutine genq65(msg0,ichk,msgsent,itone,i3,n3)
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! Encodes a Q65 message to yield itone(1:85)
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use packjt77
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character*37 msg0 !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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logical unpk77_success
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integer itone(85) !QRA64 uses only 84
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integer dgen(13)
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integer sent(63)
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integer isync(22)
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data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
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save
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if(msg0(1:1).eq.'@') then
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read(msg0(2:5),*,end=1,err=1) nfreq
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go to 2
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1 nfreq=1000
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2 itone(1)=nfreq
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write(msgsent,1000) nfreq
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1000 format(i5,' Hz')
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goto 999
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endif
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i3=-1
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n3=-1
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call pack77(msg0,i3,n3,c77)
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read(c77(60:74),'(b15)') ng15
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if(ng15.eq.32373) c77(60:74)='111111010010011' !Message is RR73
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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read(c77,1001) dgen
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1001 format(12b6.6,b5.5)
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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
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call q65_enc(dgen,sent) !Encode message, dgen(1:13) ==> sent(1:63)
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j=1
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k=0
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do i=1,85
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if(i.eq.isync(j)) then
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j=j+1 !Index for next sync symbol
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itone(i)=0 !Insert sync symbol at tone 0
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else
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k=k+1
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itone(i)=sent(k) + 1 !Q65 symbol=0 is transmitted at tone 1, etc.
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endif
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enddo
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999 return
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end subroutine genq65
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