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