508 lines
15 KiB
Plaintext
508 lines
15 KiB
Plaintext
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module jt65_decode
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integer, parameter :: NSZ=3413, NZMAX=60*12000
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type :: jt65_decoder
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procedure(jt65_decode_callback), pointer :: callback => null()
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contains
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procedure :: decode
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end type jt65_decoder
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! Callback function to be called with each decode
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abstract interface
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subroutine jt65_decode_callback(this,sync,snr,dt,freq,drift, &
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nflip,width,decoded,ft,qual,nsmo,nsum,minsync)
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import jt65_decoder
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implicit none
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class(jt65_decoder), intent(inout) :: this
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real, intent(in) :: sync
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integer, intent(in) :: snr
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real, intent(in) :: dt
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integer, intent(in) :: freq
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integer, intent(in) :: drift
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integer, intent(in) :: nflip
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real, intent(in) :: width
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character(len=22), intent(in) :: decoded
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integer, intent(in) :: ft
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integer, intent(in) :: qual
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integer, intent(in) :: nsmo
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integer, intent(in) :: nsum
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integer, intent(in) :: minsync
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end subroutine jt65_decode_callback
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end interface
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contains
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subroutine decode(this,callback,dd0,npts,newdat,nutc,nf1,nf2,nfqso, &
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ntol,nsubmode,minsync,nagain,n2pass,nrobust,ntrials,naggressive, &
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ndepth,emedelay,clearave,mycall,hiscall,hisgrid,nexp_decode)
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! Process dd0() data to find and decode JT65 signals.
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use jt65_mod
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use timer_module, only: timer
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include 'constants.f90'
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class(jt65_decoder), intent(inout) :: this
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procedure(jt65_decode_callback) :: callback
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real, intent(in) :: dd0(NZMAX),emedelay
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integer, intent(in) :: npts, nutc, nf1, nf2, nfqso, ntol &
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, nsubmode, minsync, n2pass, ntrials, naggressive, ndepth &
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, nexp_decode
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logical, intent(in) :: newdat, nagain, nrobust, clearave
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character(len=12), intent(in) :: mycall, hiscall
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character(len=6), intent(in) :: hisgrid
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real dd(NZMAX)
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real ss(552,NSZ)
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real savg(NSZ)
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real a(5)
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character*22 decoded,decoded0,avemsg,deepave
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type candidate
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real freq
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real dt
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real sync
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real flip
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end type candidate
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type(candidate) ca(300)
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type accepted_decode
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real freq
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real dt
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real sync
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character*22 decoded
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end type accepted_decode
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type(accepted_decode) dec(50)
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logical :: first_time,prtavg,single_decode,bVHF
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integer h0(0:11),d0(0:11)
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real r0(0:11)
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common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
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common/steve/thresh0
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common/sync/ss
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! 0 1 2 3 4 5 6 7 8 9 10 11
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data h0/41,42,43,43,44,45,46,47,48,48,49,49/
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data d0/71,72,73,74,76,77,78,80,81,82,83,83/
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! 0 1 2 3 4 5 6 7 8 9 10 11
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data r0/0.70,0.72,0.74,0.76,0.78,0.80,0.82,0.84,0.86,0.88,0.90,0.90/
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data nutc0/-999/,nfreq0/-999/,nsave/0/
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save
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this%callback => callback
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first_time=newdat
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dd=dd0
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ndecoded=0
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if(nsubmode.ge.100) then
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! This is QRA64 mode
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mode64=2**(nsubmode-100)
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!###
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! open(60,file='qra64_data.bin',access='stream',position='append')
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! write(60) dd,npts,nutc,nf1,nf2,nfqso,ntol,mode64,minsync,ndepth, &
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! mycall,hiscall,hisgrid
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! close(60)
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!###
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call qra64a(dd,npts,nutc,nf1,nf2,nfqso,ntol,mode64,minsync,ndepth, &
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emedelay,mycall,hiscall,hisgrid,sync,nsnr,dtx,nfreq,decoded,nft)
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if (associated(this%callback)) then
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ndrift=0
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nflip=1
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width=1.0
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nsmo=0
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nqual=0
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call this%callback(sync,nsnr,dtx,nfreq,ndrift, &
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nflip,width,decoded,nft,nqual,nsmo,1,minsync)
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end if
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go to 900
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endif
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! do ipass=1,n2pass !Two-pass decoding loop
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npass=1
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if(n2pass .gt. 1) npass=ndepth+1 !**** TEMPORARY ****
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do ipass=1,npass
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first_time=.true.
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if(ipass.eq.1) then !First-pass parameters
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thresh0=2.5
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nsubtract=1
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nrob=0
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elseif( ipass.eq.2 ) then !Second-pass parameters
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thresh0=2.0
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nsubtract=1
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nrob=0
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elseif( ipass.eq.3 ) then
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thresh0=2.0
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nsubtract=1
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nrob=0
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elseif( ipass.eq.4 ) then
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thresh0=2.0
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nsubtract=0
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nrob=1
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endif
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if(npass.eq.1) then
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nsubtract=0
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thresh0=2.0
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endif
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call timer('symsp65 ',0)
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ss=0.
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! call symspec65(dd,npts,ss,nqsym,savg) !Get normalized symbol spectra
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call symspec65(dd,npts,nqsym,savg) !Get normalized symbol spectra
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call timer('symsp65 ',1)
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nfa=nf1
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nfb=nf2
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single_decode=iand(nexp_decode,32).ne.0 .or. nagain
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bVHF=iand(nexp_decode,64).ne.0
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!### Q: should either of the next two uses of "single_decode" be "bVHF" instead?
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if(single_decode .or. (bVHF .and. ntol.lt.1000)) then
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nfa=max(200,nfqso-ntol)
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nfb=min(4000,nfqso+ntol)
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thresh0=1.0
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endif
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df=12000.0/8192.0 !df = 1.465 Hz
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if(bVHF) then
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ia=max(1,nint(nfa/df)-ntol)
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ib=min(NSZ,nint(nfb/df)+ntol)
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nz=ib-ia+1
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call lorentzian(savg(ia),nz,a)
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baseline=a(1)
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amp=a(2)
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f0=(a(3)+ia-1)*df
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width=a(4)*df
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endif
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ncand=0
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call timer('sync65 ',0)
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! call sync65(ss,nfa,nfb,naggressive,ntol,nqsym,ca,ncand,0,bVHF)
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call sync65(nfa,nfb,naggressive,ntol,nqsym,ca,ncand,nrob,bVHF)
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call timer('sync65 ',1)
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! If a candidate was found within +/- ntol of nfqso, move it into ca(1).
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call fqso_first(nfqso,ntol,ca,ncand)
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if(single_decode) then
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if(ncand.eq.0) ncand=1
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if(abs(ca(1)%freq - f0).gt.width) width=2*df !### ??? ###
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endif
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nvec=ntrials
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mode65=2**nsubmode
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nflip=1
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nqd=0
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decoded=' '
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decoded0=""
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freq0=0.
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prtavg=.false.
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if(.not.nagain) nsum=0
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if(clearave) then
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nsum=0
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nsave=0
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endif
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if(bVHF) then
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! Be sure to search for shorthand message at nfqso +/- ntol
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if(ncand.lt.300) ncand=ncand+1
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ca(ncand)%sync=5.0
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ca(ncand)%dt=2.5
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ca(ncand)%freq=nfqso
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endif
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do icand=1,ncand
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sync1=ca(icand)%sync
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dtx=ca(icand)%dt
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freq=ca(icand)%freq
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!write(*,*) icand,sync1,dtx,freq,ndepth,bVHF,mode65
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if(bVHF) then
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flip=ca(icand)%flip
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nflip=flip
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endif
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if(sync1.lt.float(minsync)) nflip=0
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if(ipass.eq.1) ntry65a=ntry65a + 1
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if(ipass.eq.2) ntry65b=ntry65b + 1
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call timer('decod65a',0)
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nft=0
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nspecial=0
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call decode65a(dd,npts,first_time,nqd,freq,nflip,mode65,nvec, &
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naggressive,ndepth,ntol,mycall,hiscall,hisgrid, &
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nexp_decode,bVHF,sync2,a,dtx,nft,nspecial,qual, &
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nhist,nsmo,decoded)
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if(nspecial.eq.2) decoded='RO'
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if(nspecial.eq.3) decoded='RRR'
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if(nspecial.eq.4) decoded='73'
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call timer('decod65a',1)
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if(sync1.lt.float(minsync) .and. &
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decoded.eq.' ') nflip=0
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if(nft.ne.0) nsum=1
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nhard_min=param(1)
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nrtt1000=param(4)
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ntotal_min=param(5)
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nsmo=param(9)
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nfreq=nint(freq+a(1))
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ndrift=nint(2.0*a(2))
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if(bVHF) then
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s2db=sync1 - 30.0 + db(width/3.3) !### VHF/UHF/microwave
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if(nspecial.gt.0) s2db=sync2
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else
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s2db=10.0*log10(sync2) - 35 !### Empirical (HF)
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endif
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nsnr=nint(s2db)
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if(nsnr.lt.-30) nsnr=-30
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if(nsnr.gt.-1) nsnr=-1
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nftt=0
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if(nft.ne.1 .and. iand(ndepth,16).eq.16 .and. (.not.prtavg)) then
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! Single-sequence FT decode failed, so try for an average FT decode.
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if(nutc.ne.nutc0 .or. abs(nfreq-nfreq0).gt.ntol) then
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! This is a new minute or a new frequency, so call avg65.
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nutc0=nutc
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nfreq0=nfreq
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nsave=nsave+1
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nsave=mod(nsave-1,64)+1
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call avg65(nutc,nsave,sync1,dtx,nflip,nfreq,mode65,ntol, &
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ndepth,nagain,ntrials,naggressive,clearave,neme,mycall, &
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hiscall,hisgrid,nftt,avemsg,qave,deepave,nsum,ndeepave)
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nsmo=param(9)
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nqave=qave
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if (associated(this%callback) .and. nsum.ge.2) then
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call this%callback(sync1,nsnr,dtx-1.0,nfreq,ndrift, &
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nflip,width,avemsg,nftt,nqave,nsmo,nsum,minsync)
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prtavg=.true.
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end if
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endif
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endif
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if(nftt.eq.1) then
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! nft=1
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decoded=avemsg
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go to 5
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endif
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n=naggressive
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rtt=0.001*nrtt1000
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if(nft.lt.2 .and. minsync.ge.0 .and. nspecial.eq.0) then
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if(nhard_min.gt.50) cycle
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if(nhard_min.gt.h0(n)) cycle
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if(ntotal_min.gt.d0(n)) cycle
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if(rtt.gt.r0(n)) cycle
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endif
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5 continue
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if(decoded.eq.decoded0 .and. abs(freq-freq0).lt. 3.0 .and. &
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minsync.ge.0) cycle !Don't display dupes
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if(decoded.ne.' ' .or. minsync.lt.0) then
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if(nsubtract.eq.1) then
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call timer('subtr65 ',0)
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call subtract65(dd,npts,freq,dtx)
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call timer('subtr65 ',1)
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endif
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ndupe=0 ! de-dedupe
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do i=1, ndecoded
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if(decoded==dec(i)%decoded) then
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ndupe=1
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exit
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endif
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enddo
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if(ndupe.ne.1 .and. sync1.ge.float(minsync)) then
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if(ipass.eq.1) n65a=n65a + 1
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if(ipass.eq.2) n65b=n65b + 1
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if(ndecoded.lt.50) ndecoded=ndecoded+1
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dec(ndecoded)%freq=freq+a(1)
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dec(ndecoded)%dt=dtx
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dec(ndecoded)%sync=sync2
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dec(ndecoded)%decoded=decoded
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nqual=min(qual,9999.0)
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if (associated(this%callback)) then
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call this%callback(sync1,nsnr,dtx-1.0,nfreq,ndrift, &
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nflip,width,decoded,nft,nqual,nsmo,1,minsync)
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end if
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endif
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decoded0=decoded
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freq0=freq
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if(decoded0.eq.' ') decoded0='*'
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endif
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enddo !Candidate loop
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if(ipass.eq.2 .and. ndecoded.lt.1) exit
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enddo !Two-pass loop
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900 return
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end subroutine decode
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subroutine avg65(nutc,nsave,snrsync,dtxx,nflip,nfreq,mode65,ntol,ndepth, &
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nagain, ntrials,naggressive,clearave,neme,mycall,hiscall,hisgrid,nftt, &
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avemsg,qave,deepave,nsum,ndeepave)
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! Decodes averaged JT65 data
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use jt65_mod
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parameter (MAXAVE=64)
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character*22 avemsg,deepave,deepbest
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character mycall*12,hiscall*12,hisgrid*6
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character*1 csync,cused(64)
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logical nagain
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integer iused(64)
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! Accumulated data for message averaging
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integer iutc(MAXAVE)
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integer nfsave(MAXAVE)
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integer nflipsave(MAXAVE)
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real s1b(-255:256,126)
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real s1save(-255:256,126,MAXAVE)
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real s2(66,126)
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real s3save(64,63,MAXAVE)
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real s3b(64,63)
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real s3c(64,63)
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real dtsave(MAXAVE)
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real syncsave(MAXAVE)
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logical first,clearave
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data first/.true./
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save
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if(first .or. clearave) then
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iutc=-1
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nfsave=0
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dtdiff=0.2
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first=.false.
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s3save=0.
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s1save=0.
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nsave=1 !### ???
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! Silence compiler warnings
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if(nagain .and. ndeepave.eq.-99 .and. neme.eq.-99) stop
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endif
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do i=1,64
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if(iutc(i).lt.0) exit
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if(nutc.eq.iutc(i) .and. abs(nfreq-nfsave(i)).le.ntol) go to 10
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enddo
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! Save data for message averaging
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iutc(nsave)=nutc
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syncsave(nsave)=snrsync
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dtsave(nsave)=dtxx
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nfsave(nsave)=nfreq
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nflipsave(nsave)=nflip
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s1save(-255:256,1:126,nsave)=s1
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s3save(1:64,1:63,nsave)=s3a
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10 syncsum=0.
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dtsum=0.
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nfsum=0
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nsum=0
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s1b=0.
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s3b=0.
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s3c=0.
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do i=1,MAXAVE !Consider all saved spectra
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cused(i)='.'
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if(iutc(i).lt.0) cycle
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if(mod(iutc(i),2).ne.mod(nutc,2)) cycle !Use only same (odd/even) seq
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if(abs(dtxx-dtsave(i)).gt.dtdiff) cycle !DT must match
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if(abs(nfreq-nfsave(i)).gt.ntol) cycle !Freq must match
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if(nflip.ne.nflipsave(i)) cycle !Sync type (*/#) must match
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s3b=s3b + s3save(1:64,1:63,i)
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s1b=s1b + s1save(-255:256,1:126,i)
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syncsum=syncsum + syncsave(i)
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dtsum=dtsum + dtsave(i)
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nfsum=nfsum + nfsave(i)
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cused(i)='$'
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nsum=nsum+1
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iused(nsum)=i
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enddo
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if(nsum.lt.64) iused(nsum+1)=0
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syncave=0.
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dtave=0.
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fave=0.
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if(nsum.gt.0) then
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syncave=syncsum/nsum
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dtave=dtsum/nsum
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fave=float(nfsum)/nsum
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endif
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do i=1,nsave
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csync='*'
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if(nflipsave(i).lt.0.0) csync='#'
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write(14,1000) cused(i),iutc(i),syncsave(i),dtsave(i)-1.0,nfsave(i),csync
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1000 format(a1,i5.4,f6.1,f6.2,i6,1x,a1)
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enddo
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if(nsum.lt.2) go to 900
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nftt=0
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df=1378.125/512.0
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! Do the smoothing loop
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qualbest=0.
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minsmo=0
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maxsmo=0
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if(mode65.ge.2) then
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minsmo=nint(width/df)
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maxsmo=2*minsmo
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endif
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nn=0
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do ismo=minsmo,maxsmo
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if(ismo.gt.0) then
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do j=1,126
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call smo121(s1b(-255,j),512)
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if(j.eq.1) nn=nn+1
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if(nn.ge.4) then
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call smo121(s1b(-255,j),512)
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if(j.eq.1) nn=nn+1
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endif
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enddo
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endif
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do i=1,66
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jj=i
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if(mode65.eq.2) jj=2*i-1
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if(mode65.eq.4) then
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ff=4*(i-1)*df - 355.297852
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jj=nint(ff/df)+1
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endif
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s2(i,1:126)=s1b(jj,1:126)
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enddo
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do j=1,63
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k=mdat(j) !Points to data symbol
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if(nflip.lt.0) k=mdat2(j)
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do i=1,64
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s3c(i,j)=4.e-5*s2(i+2,k)
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enddo
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enddo
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nadd=nsum*ismo
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call extract(s3c,nadd,mode65,ntrials,naggressive,ndepth,nflip,mycall, &
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hiscall,hisgrid,nexp_decode,ncount,nhist,avemsg,ltext,nftt,qual)
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if(nftt.eq.1) then
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nsmo=ismo
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param(9)=nsmo
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go to 900
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else if(nftt.eq.2) then
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if(qual.gt.qualbest) then
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deepbest=avemsg
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qualbest=qual
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nnbest=nn
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nsmobest=ismo
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nfttbest=nftt
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endif
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endif
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enddo
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if(nfttbest.eq.2) then
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avemsg=deepbest !### ???
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deepave=deepbest
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qave=qualbest
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nsmo=nsmobest
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param(9)=nsmo
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nftt=nfttbest
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endif
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900 continue
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return
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end subroutine avg65
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end module jt65_decode
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