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87 lines
2.3 KiB
Fortran
87 lines
2.3 KiB
Fortran
subroutine genft2(msg0,ichk,msgsent,i4tone,itype)
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! s8 + 48bits + s8 + 80 bits = 144 bits (72ms message duration)
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!
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! Encode an MSK144 message
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! Input:
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! - msg0 requested message to be transmitted
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! - ichk if ichk=1, return only msgsent
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! if ichk.ge.10000, set imsg=ichk-10000 for short msg
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! - msgsent message as it will be decoded
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! - i4tone array of audio tone values, 0 or 1
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! - itype message type
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! 1 = 77 bit message
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! 7 = 16 bit message "<Call_1 Call2> Rpt"
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use iso_c_binding, only: c_loc,c_size_t
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use packjt77
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character*37 msg0
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character*37 message !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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integer*4 i4tone(144)
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integer*1 codeword(128)
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integer*1 msgbits(77)
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integer*1 bitseq(144) !Tone #s, data and sync (values 0-1)
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integer*1 s16(16)
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real*8 xi(864),xq(864),pi,twopi
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data s16/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0/
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equivalence (ihash,i1hash)
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logical unpk77_success
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nsym=128
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pi=4.0*atan(1.0)
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twopi=8.*atan(1.0)
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message(1:37)=' '
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itype=1
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if(msg0(1:1).eq.'@') then !Generate a fixed tone
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read(msg0(2:5),*,end=1,err=1) nfreq !at specified frequency
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go to 2
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1 nfreq=1000
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2 i4tone(1)=nfreq
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else
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message=msg0
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do i=1, 37
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if(ichar(message(i:i)).eq.0) then
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message(i:37)=' '
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exit
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endif
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enddo
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do i=1,37 !Strip leading blanks
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if(message(1:1).ne.' ') exit
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message=message(i+1:)
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enddo
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if(message(1:1).eq.'<') then
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i2=index(message,'>')
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i1=0
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if(i2.gt.0) i1=index(message(1:i2),' ')
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if(i1.gt.0) then
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call genmsk40(message,msgsent,ichk,i4tone,itype)
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if(itype.lt.0) go to 999
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i4tone(41)=-40
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go to 999
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endif
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endif
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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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if(ichk.eq.1) go to 999
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read(c77,"(77i1)") msgbits
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call encode_128_90(msgbits,codeword)
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!Create 144-bit channel vector:
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bitseq=0
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bitseq(1:16)=s16
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bitseq(17:144)=codeword
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i4tone=bitseq
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endif
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999 return
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end subroutine genft2
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