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41 lines
1.1 KiB
Fortran
41 lines
1.1 KiB
Fortran
subroutine genft8_174_91(msg,mygrid,bcontest,i5bit,msgsent,msgbits,itone)
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! Encode an FT8 message, producing array itone().
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use packjt
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include 'ft8_params.f90'
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character*22 msg,msgsent
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character*6 mygrid
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character*91 cbits
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logical bcontest
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integer*4 i4Msg6BitWords(12) !72-bit message as 6-bit words
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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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data icos7/3,1,4,0,6,5,2/ !Costas 7x7 tone pattern
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data graymap/0,1,3,2,7,6,4,5/
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call packmsg(msg,i4Msg6BitWords,itype,bcontest) !Pack into 12 6-bit bytes
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call unpackmsg(i4Msg6BitWords,msgsent,bcontest,mygrid) !Unpack to get msgsent
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write(cbits,'(12b6.6,b8.8)') i4Msg6BitWords,8*i5bit
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read(cbits,'(77i1)') msgbits
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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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return
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end subroutine genft8_174_91
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