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47 lines
1.1 KiB
Fortran
47 lines
1.1 KiB
Fortran
subroutine genft8(msg,i3,n3,msgsent,msgbits,itone)
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! Encode an FT8 message, producing array itone().
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use packjt77
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include 'ft8_params.f90'
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character msg*37,msgsent*37
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character*77 c77
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integer*1 msgbits(77),codeword(174)
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integer itone(79)
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integer icos7(0:6)
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integer graymap(0:7)
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logical unpk77_success
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data icos7/3,1,4,0,6,5,2/ !Costas 7x7 tone pattern
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data graymap/0,1,3,2,5,6,4,7/
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i3=-1
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n3=-1
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call pack77(msg,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success)
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read(c77,'(77i1)',err=1) msgbits
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if(unpk77_success) go to 2
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1 msgbits=0
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itone=0
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msgsent='*** bad message *** '
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go to 900
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entry get_ft8_tones_from_77bits(msgbits,itone)
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2 call encode174_91(msgbits,codeword) !Encode the test message
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! Message structure: S7 D29 S7 D29 S7
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itone(1:7)=icos7
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itone(36+1:36+7)=icos7
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itone(NN-6:NN)=icos7
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k=7
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do j=1,ND
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i=3*j -2
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k=k+1
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if(j.eq.30) k=k+7
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indx=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
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itone(k)=graymap(indx)
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enddo
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900 return
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end subroutine genft8
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