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