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73 lines
2.1 KiB
Fortran
73 lines
2.1 KiB
Fortran
subroutine foxgen()
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! Called from MainWindow::foxTxSequencer() to generate the Tx waveform in
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! FT8 Fox mode. The Tx message can contain up to 5 "slots", each carrying
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! its own FT8 signal.
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! Encoded messages can be of the form "HoundCall FoxCall rpt" (a standard FT8
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! message with i3bit=0) or "HoundCall_1 RR73; HoundCall_2 <FoxCall> rpt",
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! a new message type with i3bit=1. The waveform is generated with
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! fsample=48000 Hz; it is compressed to reduce the PEP-to-average power ratio,
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! with (currently disabled) filtering afterware to reduce spectral growth.
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! Input message information is provided in character array cmsg(5), in
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! common/foxcom/. The generated wave(NWAVE) is passed back in the same
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! common block.
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parameter (NN=79,ND=58,NSPS=4*1920)
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parameter (NWAVE=(160+2)*134400*4) !the biggest waveform we generate (FST4-1800 at 48kHz)
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parameter (NFFT=614400,NH=NFFT/2)
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character*40 cmsg
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character*37 msg,msgsent
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integer itone(79)
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integer*1 msgbits(77),msgbits2
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integer*1, target:: mycall
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real x(NFFT)
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real*8 dt,twopi,f0,fstep,dfreq,phi,dphi
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complex cx(0:NH)
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common/foxcom/wave(NWAVE),nslots,nfreq,i3bit(5),cmsg(5),mycall(12)
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common/foxcom2/itone2(NN),msgbits2(77)
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equivalence (x,cx),(y,cy)
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fstep=60.d0
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dfreq=6.25d0
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dt=1.d0/48000.d0
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twopi=8.d0*atan(1.d0)
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irpt=0
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nplot=0
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wave=0.
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do n=1,nslots
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msg=cmsg(n)(1:37)
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call genft8(msg,i3,n3,msgsent,msgbits,itone)
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! Make copies of itone() and msgbits() for ft8sim
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itone2=itone
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msgbits2=msgbits
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f0=nfreq + fstep*(n-1)
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phi=0.d0
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k=0
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do j=1,NN
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f=f0 + dfreq*itone(j)
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dphi=twopi*f*dt
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do ii=1,NSPS
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k=k+1
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phi=phi+dphi
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xphi=phi
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wave(k)=wave(k)+sin(xphi)
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enddo
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enddo
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enddo
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kz=k
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peak1=maxval(abs(wave))
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wave=wave/peak1
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width=50.0
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call foxfilt(nslots,nfreq,width,wave)
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peak3=maxval(abs(wave))
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wave=wave/peak3
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return
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end subroutine foxgen
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! include 'plotspec.f90'
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