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71 lines
2.0 KiB
Fortran
71 lines
2.0 KiB
Fortran
subroutine genqra64(msg0,ichk,msgsent,itone,itype)
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! Encodes a QRA64 message to yield itone(1:84) or a QRA65 msg, itone(1:85)
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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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integer itone(85) !QRA64 uses only 84
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character*3 cok !' ' or 'OOO'
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integer dgen(13)
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integer sent(63)
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integer isync(22)
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integer icos7(0:6)
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data icos7/2,5,6,0,4,1,3/ !Defines a 7x7 Costas array
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data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
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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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write(msgsent,1000) nfreq
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1000 format(i5,' Hz')
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else
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message=msg0
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do i=1,22
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if(ichar(message(i:i)).eq.0) then
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message(i:)=' '
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exit
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endif
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enddo
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do i=1,22 !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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call chkmsg(message,cok,nspecial,flip)
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call packmsg(message,dgen,itype) !Pack message into 72 bits
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call unpackmsg(dgen,msgsent) !Unpack to get message sent
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if(ichk.eq.1) go to 999 !Return if checking only
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call qra64_enc(dgen,sent) !Encode using QRA64
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if(ichk.eq.65) then
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! Experimental QRA65 mode
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j=1
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k=0
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do i=1,85
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if(i.eq.isync(j)) then
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j=j+1 !Index for next sync symbol
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itone(i)=0 !Insert a sync symbol
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else
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k=k+1
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itone(i)=sent(k) + 1
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endif
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enddo
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else
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! Original QRA64 mode
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itone(1:7)=10*icos7 !Insert 7x7 Costas array in 3 places
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itone(8:39)=sent(1:32)
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itone(40:46)=10*icos7
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itone(47:77)=sent(33:63)
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itone(78:84)=10*icos7
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endif
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endif
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999 return
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end subroutine genqra64
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