WSJT-X/map65/libm65/gen_q65_wave.f90

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Fortran
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2021-04-22 14:04:08 -04:00
subroutine gen_q65_wave(msg,ntxfreq,mode65,msgsent,iwave,nwave)
! Encodes a QRA64 message to yield complex iwave() at fsample = 11025 Hz
use packjt
parameter (NMAX=2*60*11025)
character*22 msg
character*22 msgsent !Message as it will be received
character*120 cmnd
character*80 wsjtx_dir
character*16 cjunk
real*8 t,dt,phi,f,f0,dfgen,dphi,twopi,tsym
integer itone(85)
integer*2 iwave(NMAX)
integer icos7(0:6)
data icos7/2,5,6,0,4,1,3/ !Defines a 7x7 Costas array
data twopi/6.283185307179586476d0/
save
open(9,file='wsjtx_dir.txt',status='old')
read(9,'(a)') wsjtx_dir
close(9)
msgsent=msg
! 1 2 3 4 5
! 12345678901234567890123456789012345678901234567890123456789012345
cmnd='q65sim "K1ABC W9XYZ EN37 " A 1500 0 0 0 0 60 0 99 >itone.txt'
cmnd(9:30)=msg
write(cmnd(35:38),'(i4)') ntxfreq
cmnd=trim(wsjtx_dir)//cmnd
call execute_command_line(cmnd)
open(9,file='itone.txt',status='old')
do i=1,99
read(9,1000,end=999) cjunk
1000 format(a16)
if(cjunk.eq.'Channel symbols:') exit
enddo
read(9,1002) itone
1002 format(20i3)
close(9)
! Set up necessary constants
nsym=85
tsym=7200.d0/12000.d0
dt=1.d0/11025.d0
f0=ntxfreq
ndf=2**(mode65-1)
dfgen=ndf*12000.d0/7200.d0
phi=0.d0
dphi=twopi*dt*f0
i=0
iz=85*7200*11025.d0/12000.d0
t=0.d0
j0=0
do i=1,iz
t=t+dt
j=t/tsym
if(j.ne.j0) then
f=f0 + itone(j)*dfgen
dphi=twopi*dt*f
j0=j
endif
phi=phi+dphi
if(phi.gt.twopi) phi=phi-twopi
xphi=phi
iwave(2*i-1)=32767.0*cos(xphi)
iwave(2*i)=32767.0*sin(xphi)
enddo
nwave=2*iz
999 return
end subroutine gen_q65_wave