subroutine genmsk40(msg,msgsent,ichk,itone,itype) use hashing character*22 msg,msgsent,hashmsg character*4 crpt,rpt(0:15) logical first integer*4 itone(144) integer*1 message(16),codeword(32),bitseq(40) integer*1 s8r(8) data s8r/1,0,1,1,0,0,0,1/ ! Sync word is reversed wrt msk144 sync word. data first/.true./ data rpt/"-03 ","+00 ","+03 ","+06 ","+10 ","+13 ","+16 ", & "R-03","R+00","R+03","R+06","R+10","R+13","R+16", & "RRR ","73 "/ save first,rpt itype=-1 msgsent='*** bad message ***' itone=0 i1=index(msg,'>') if(i1.lt.9) go to 900 call fmtmsg(msg,iz) crpt=msg(i1+2:i1+5) do i=0,15 if(crpt.eq.rpt(i)) go to 10 enddo go to 900 10 irpt=i !Report index, 0-15 if(ichk.lt.10000) then hashmsg=msg(2:i1-1) call hash(hashmsg,22,ihash) ihash=iand(ihash,4095) !12-bit hash ig=16*ihash + irpt !4-bit report else ig=ichk-10000 endif do i=1,16 message(i)=iand(1,ishft(ig,1-i)) enddo call encode_msk40(message,codeword) ! write(*,'(a6,i6,2x,a6,i6,2x,a6,i6)') ' msg: ',ig,'rprt: ',irpt,'hash: ',ihash ! write(*,'(a6,32i1)') ' cw: ',codeword bitseq(1:8)=s8r bitseq(9:40)=codeword bitseq=2*bitseq-1 ! Map I and Q to tones. itone=0 do i=1, 20 itone(2*i-1)=(bitseq(2*i)*bitseq(2*i-1)+1)/2; itone(2*i)=-(bitseq(2*i)*bitseq(mod(2*i,40)+1)-1)/2; enddo ! Flip polarity itone=-itone+1 msgsent=msg itype=7 900 return end subroutine genmsk40