subroutine fivehz ! Called at interrupt level from the PortAudio callback routine. ! For nspb=2048 the callback rate is nfsample/nspb = 5.38 Hz. ! Thus, we should be able to control the timing of T/R sequence events ! here to within about 0.2 s. ! Do not do anything very time consuming in this routine!! ! Disk I/O is a bad idea. Writing to stdout (for diagnostic purposes) ! seems to be OK. #ifdef Win32 use dflib use dfport #endif real*8 tstart,tstop,t60 logical first,txtime,debug integer ptt integer TxOKz real*8 fs,fsample,tt,tt0,u include 'gcom1.f90' include 'gcom2.f90' data first/.true./,nc0/1/,nc1/1/ save n1=time() n2=mod(n1,86400) tt=n1-n2+tsec-0.1d0*ndsec if(first) then rxdelay=0.2 txdelay=0.4 tlatency=1.0 first=.false. iptt=0 ntr0=-99 debug=.false. rxdone=.false. ibuf00=-99 ncall=-1 tt0=tt u=0.1d0 fsample=11025.d0 maxms=0 mfsample=110250 endif if(txdelay.lt.0.2d0) txdelay=0.2d0 ! Measure average sampling frequency over a recent interval ncall=ncall+1 if(ncall.eq.9) tt0=tt if(ncall.ge.10 .and. mod(ncall,2).eq.1) then fs=(ncall-9)*2048.d0/(tt-tt0) fsample=u*fs + (1.d0-u)*fsample mfsample=nint(10.d0*fsample) endif if(trperiod.le.0) trperiod=30 tx1=0.0 !Time to start a TX sequence tx2=trperiod-(tlatency+txdelay) !Time to turn TX off if(mode(1:4).eq.'JT65') then if(nwave.lt.126*4096) nwave=126*4096 tx2=txdelay + nwave/11025.0 if(tx2.gt.(trperiod-2.0)) tx2=trperiod-tlatency-1.0 endif if(TxFirst.eq.0) then tx1=tx1+trperiod tx2=tx2+trperiod endif t=mod(Tsec,2.d0*trperiod) txtime = t.ge.tx1 .and. t.lt.tx2 ! If we're transmitting, freeze the input buffer pointers where they were. receiving=1 if(((txtime .and. (lauto.eq.1)) .or. TxOK.eq.1 .or. transmitting.eq.1) & .and. (mute.eq.0)) then receiving=0 ibuf=ibuf000 iwrite=iwrite000 endif ibuf000=ibuf iwrite000=iwrite nsec=Tsec ntr=mod(nsec/trperiod,2) !ntr=0 in 1st sequence, 1 in 2nd if(ntr.ne.ntr0) then ibuf0=ibuf !Start of new sequence, save ibuf ! if(mode(1:4).ne.'JT65') then ! ibuf0=ibuf0+3 !So we don't copy our own Tx ! if(ibuf0.gt.1024) ibuf0=ibuf0-1024 ! endif ntime=time() !Save start time if(mantx.eq.1 .and. iptt.eq.1) then mantx=0 TxOK=0 endif endif ! Switch PTT line and TxOK appropriately if(lauto.eq.1) then if(txtime .and. iptt.eq.0 .and. & mute.eq.0) i1=ptt(nport,pttport,1,iptt) !Raise PTT if(.not.txtime .or. mute.eq.1) TxOK=0 !Lower TxOK else if(mantx.eq.1 .and. iptt.eq.0 .and. & mute.eq.0) i2=ptt(nport,pttport,1,iptt) !Raise PTT if(mantx.eq.0 .or. mute.eq.1) TxOK=0 !Lower TxOK endif ! Calculate Tx waveform as needed if((iptt.eq.1 .and. iptt0.eq.0) .or. nrestart.eq.1) then call wsjtgen nrestart=0 endif ! If PTT was just raised, start a countdown for raising TxOK: nc1a=txdelay/0.18576 if(nc1a.lt.2) nc1a=2 if(iptt.eq.1 .and. iptt0.eq.0) nc1=-nc1a-1 if(nc1.le.0) nc1=nc1+1 if(nc1.eq.0) TxOK=1 ! We are transmitting ! If TxOK was just lowered, start a countdown for lowering PTT: nc0a=(tlatency+txdelay)/0.18576 if(nc0a.lt.5) nc0a=5 if(TxOK.eq.0 .and. TxOKz.eq.1 .and. iptt.eq.1) nc0=-nc0a-1 if(nc0.le.0) nc0=nc0+1 if(nc0.eq.0) i3=ptt(nport,pttport,0,iptt) if(iptt.eq.0 .and.TxOK.eq.0) then sending=" " sendingsh=0 endif nbufs=ibuf-ibuf0 if(nbufs.lt.0) nbufs=nbufs+1024 tdata=nbufs*2048.0/11025.0 if(mode(1:4).eq.'JT65' .and. monitoring.eq.1 .and. tdata.gt.53.0 & .and. ibuf0.ne.ibuf00) then rxdone=.true. ibuf00=ibuf0 endif ! Diagnostic timing information: ! t60=mod(tsec,60.d0) ! if(TxOK.ne.TxOKz) then ! if(TxOK.eq.1) write(*,1101) 'D2:',t !1101 format(a3,f8.1,i8) ! if(TxOK.eq.0) then ! tstop=tsec ! write(*,1101) 'D3:',t,nc0a ! endif ! endif ! if(iptt.ne.iptt0) then ! if(iptt.eq.1) then ! tstart=tsec ! write(*,1101) 'D1:',t,nc1a ! endif ! if(iptt.eq.0) write(*,1101) 'D4:',t ! endif iptt0=iptt TxOKz=TxOK ntr0=ntr return end subroutine fivehz subroutine fivehztx ! Called at interrupt level from the PortAudio output callback. #ifdef Win32 use dflib use dfport #endif logical first real*8 fs,fsample,tt,tt0,u include 'gcom1.f90' data first/.true./ save n1=time() n2=mod(n1,86400) tt=n1-n2+tsec-0.1d0*ndsec if(first) then first=.false. ncall=-1 fsample=11025.d0 nsec0=-999 u=0.1d0 mfsample2=110250 tt0=tt endif ncall=ncall+1 if(ncall.eq.9) tt0=tt if(ncall.ge.10 .and. mod(ncall,2).eq.1) then fs=(ncall-9)*2048.d0/(tt-tt0) fsample=u*fs + (1.d0-u)*fsample mfsample2=nint(10.d0*fsample) endif return end subroutine fivehztx subroutine addnoise(n) integer*2 n real*8 txsnrdb0 include 'gcom1.f90' data idum/0/ save if(txsnrdb.gt.40.0) return if(txsnrdb.ne.txsnrdb0) then snr=10.0**(0.05*(txsnrdb-1)) fac=3000.0 if(snr.gt.1.0) fac=3000.0/snr txsnrdb0=txsnrdb endif i=fac*(gran(idum) + n*snr/32768.0) if(i>32767) i=32767; if(i<-32767) i=-32767; n=i return end subroutine addnoise real function gran(idum) real r(12) if(idum.lt.0) then call random_seed idum=0 endif call random_number(r) gran=sum(r)-6.0 end function gran