67 lines
1.7 KiB
Plaintext
67 lines
1.7 KiB
Plaintext
subroutine genmsk_short(msg,msgsent,ichk,itone,itype)
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use hashing
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character*22 msg,msgsent
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character*3 crpt,rpt(0:7)
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logical first
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integer itone(35)
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integer ig24(0:4096-1) !Codewords for Golay (24,12) code
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integer b11(11)
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data b11/1,1,1,0,0,0,1,0,0,1,0/ !Barker 11 code
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data rpt /'26 ','27 ','28 ','R26','R27','R28','RRR','73 '/
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data first/.true./
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save first,ig24
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if(first) then
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call golay24_table(ig24) !Define the Golay(24,12) codewords
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first=.false.
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endif
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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=0,7
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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, 0-7
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if(ichk.lt.10000) then
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call hash(msg(2:i1-1),i1-2,ihash)
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ihash=iand(ihash,511) !9-bit hash for the two callsigns
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ig=8*ihash + irpt !12-bit message information
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else
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ig=ichk-10000
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endif
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ncodeword=ig24(ig)
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itone(1:11)=b11 !Insert the Barker-11 code
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n=2**24
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do i=12,35 !Insert codeword into itone array
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n=n/2
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itone(i)=0
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if(iand(ncodeword,n).ne.0) itone(i)=1
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enddo
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msgsent=msg
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itype=7
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n=count(itone(1:35).eq.0)
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if(mod(n,2).ne.0) stop 'Parity error in genmsk_short.'
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900 return
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end subroutine genmsk_short
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subroutine hash_calls(calls,ih9)
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use hashing
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character*(*) calls
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i1=index(calls,'>')
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call hash(calls(2:i1-1),i1-2,ih9)
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ih9=iand(ih9,511) !9-bit hash for the two callsigns
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return
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end subroutine hash_calls
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