149 lines
4.1 KiB
Fortran
149 lines
4.1 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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use crc
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parameter (NN=79,ND=58,KK=87,NSPS=4*1920)
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parameter (NWAVE=NN*NSPS,NFFT=614400,NH=NFFT/2)
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character*40 cmsg
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character*22 msg,msgsent
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character*6 mygrid
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character*87 cbits
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character*88 cb88
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logical bcontest
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integer itone(NN)
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integer icos7(0:6)
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integer*1 msgbits(KK),codeword(3*ND),msgbits2
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integer*1, target:: i1Msg8BitBytes(11)
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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(KK)
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equivalence (x,cx),(y,cy)
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data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern
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bcontest=.false.
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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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mygrid=' '
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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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i3b=i3bit(n)
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if(i3b.eq.0) then
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msg=cmsg(n)(1:22) !Stansard FT8 message
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else
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i1=index(cmsg(n),' ') !Special Fox message
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i2=index(cmsg(n),';')
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i3=index(cmsg(n),'<')
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i4=index(cmsg(n),'>')
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msg=cmsg(n)(1:i1)//cmsg(n)(i2+1:i3-2)//' '
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read(cmsg(n)(i4+2:i4+4),*) irpt
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endif
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call genft8(msg,mygrid,bcontest,0,msgsent,msgbits,itone)
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! print*,'Foxgen:',n,cmsg(n),msgsent
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if(i3b.eq.1) then
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icrc10=crc10(c_loc(mycall),12)
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nrpt=irpt+30
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write(cbits,1001) msgbits(1:56),icrc10,nrpt,i3b,0
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1001 format(56b1.1,b10.10,b6.6,b3.3,b12.12)
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read(cbits,1002) msgbits
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1002 format(87i1)
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cb88=cbits//'0'
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read(cb88,1003) i1Msg8BitBytes(1:11)
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1003 format(11b8)
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icrc12=crc12(c_loc(i1Msg8BitBytes),11)
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write(cbits,1001) msgbits(1:56),icrc10,nrpt,i3b,icrc12
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read(cbits,1002) msgbits
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call encode174(msgbits,codeword) !Encode the test message
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! Message structure: S7 D29 S7 D29 S7
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itone(1:7)=icos7
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itone(36+1:36+7)=icos7
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itone(NN-6:NN)=icos7
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k=7
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do j=1,ND
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i=3*j -2
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k=k+1
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if(j.eq.30) k=k+7
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itone(k)=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
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enddo
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endif
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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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! call plotspec(1,wave) !Plot the spectrum
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! Apply compression
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! rms=sqrt(dot_product(wave,wave)/kz)
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! wave=wave/rms
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! do i=1,NWAVE
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! wave(i)=h1(wave(i))
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! enddo
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! peak2=maxval(abs(wave))
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! wave=wave/peak2
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! call plotspec(2,wave) !Plot the spectrum
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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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! nadd=1000
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! j=0
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! do i=1,NWAVE,nadd
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! sx=dot_product(wave(i:i+nadd-1),wave(i:i+nadd-1))
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! j=j+1
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! write(30,3001) j,sx/nadd
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!3001 format(i8,f12.6)
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! enddo
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! call plotspec(3,wave) !Plot the spectrum
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return
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end subroutine foxgen
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! include 'plotspec.f90'
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