2015-04-22 17:48:03 +00:00
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subroutine gen4(msg0,ichk,msgsent,itone,itype)
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! Encode a JT4 message. Returns msgsent, the message as it will be
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! decoded, an integer array itone(206) of 4-FSK tons values in the
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! range 0-3; and itype, the JT message type.
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use jt4
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use packjt
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character*22 msg0
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character*22 message !Message to be generated
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character*22 msgsent !Message as it will be received
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character*1 c
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integer itone(206)
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integer*4 i4Msg6BitWords(13) !72-bit message as 6-bit words
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integer mettab(-128:127,0:1)
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save
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if(msg0(1:1).eq.'@') then
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read(msg0(2:5),*,end=1,err=1) nfreq
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go to 2
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1 nfreq=1000
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2 itone(1)=nfreq
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msgsent=msg0
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else
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call getmet4(mettab,ndelta)
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message=msg0
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call fmtmsg(message,iz)
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2017-09-01 20:10:35 +00:00
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call packmsg(message,i4Msg6BitWords,itype,.false.) !Pack into 12 6-bit bytes
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call unpackmsg(i4Msg6BitWords,msgsent,.false.,' ') !Unpack to get msgsent
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2015-04-22 17:48:03 +00:00
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if(ichk.ne.0) go to 999
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call encode4(message,itone) !Encode the information bits
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i1=index(message,'-')
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c=message(i1+1:i1+1)
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if(i1.ge.9 .and. c.ge.'0' .and. c.le.'3') then
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itone=2*itone + (1-npr(2:)) !Inverted '#' sync
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else
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itone=2*itone + npr(2:) !Data = MSB, sync = LSB
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endif
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endif
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999 return
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end subroutine gen4
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