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https://github.com/saitohirga/WSJT-X.git
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208 lines
6.2 KiB
Fortran
208 lines
6.2 KiB
Fortran
module qra65_decode
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type :: qra65_decoder
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procedure(qra65_decode_callback), pointer :: callback
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contains
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procedure :: decode
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end type qra65_decoder
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abstract interface
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subroutine qra65_decode_callback (this,nutc,sync,nsnr,dt,freq, &
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decoded,nap,qual,ntrperiod,fmid,w50)
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import qra65_decoder
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implicit none
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class(qra65_decoder), intent(inout) :: this
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integer, intent(in) :: nutc
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real, intent(in) :: sync
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integer, intent(in) :: nsnr
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real, intent(in) :: dt
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real, intent(in) :: freq
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character(len=37), intent(in) :: decoded
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integer, intent(in) :: nap
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real, intent(in) :: qual
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integer, intent(in) :: ntrperiod
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real, intent(in) :: fmid
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real, intent(in) :: w50
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end subroutine qra65_decode_callback
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end interface
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contains
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subroutine decode(this,callback,iwave,nutc,ntrperiod,nsubmode,nfqso, &
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ntol,ndepth,mycall,hiscall,hisgrid)
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use timer_module, only: timer
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use packjt
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use, intrinsic :: iso_c_binding
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parameter (NMAX=300*12000) !### Needs to be 300*12000 ###
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class(qra65_decoder), intent(inout) :: this
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procedure(qra65_decode_callback) :: callback
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character(len=12) :: mycall, hiscall
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character(len=6) :: hisgrid
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character*37 decoded
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integer*2 iwave(NMAX) !Raw data
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integer dat4(12)
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logical lapdx,ltext
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complex, allocatable :: c0(:) !Analytic signal, 6000 S/s
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real, allocatable, save :: s3(:,:) !Symbol spectra
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real, allocatable, save :: s3a(:,:) !Symbol spectra for avg messages
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real a(5)
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data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/,nsubmodez/-1/
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save nc1z,nc2z,ng2z,maxaptypez,nsave,nsubmodez
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mode65=2**nsubmode
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nfft1=ntrperiod*12000
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nfft2=ntrperiod*6000
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allocate (c0(0:nfft1-1))
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if(nsubmode.ne.nsubmodez) then
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if(allocated(s3)) deallocate(s3)
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if(allocated(s3a)) deallocate(s3a)
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allocate(s3(-64:64*mode65+63,63))
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allocate(s3a(-64:64*mode65+63,63))
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endif
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if(ntrperiod.eq.15) then
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nsps=1800
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else if(ntrperiod.eq.30) then
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nsps=3600
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else if(ntrperiod.eq.60) then
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nsps=7680
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else if(ntrperiod.eq.120) then
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nsps=16000
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else if(ntrperiod.eq.300) then
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nsps=41472
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else
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stop 'Invalid TR period'
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endif
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baud=12000.0/nsps
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df1=12000.0/nfft1
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! do i=1,12000*ntrperiod
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! write(61,3061) i/12000.0,iwave(i)/32767.0
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!3061 format(2f12.6)
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! enddo
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this%callback => callback
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if(nutc.eq.-999) print*,lapdx,nfa,nfb,nfqso !Silence warning
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! Prime the QRA decoder for possible use of AP
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call packcall(mycall(1:6),nc1,ltext)
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call packcall(hiscall(1:6),nc2,ltext)
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call packgrid(hisgrid(1:4),ng2,ltext)
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b90=20.0 !8 to 25 is OK; not very critical
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nFadingModel=1
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! AP control could be done differently, but this works well:
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maxaptype=0
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if(ndepth.eq.2) maxaptype=3
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if(ndepth.eq.3) maxaptype=5
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if(nc1.ne.nc1z .or. nc2.ne.nc2z .or. ng2.ne.ng2z .or. &
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maxaptype.ne.maxaptypez) then
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do naptype=0,maxaptype
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if(naptype.eq.2 .and. maxaptype.eq.4) cycle
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call qra64_dec(s3,nc1,nc2,ng2,naptype,1,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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enddo
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nc1z=nc1
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nc2z=nc2
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ng2z=ng2
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maxaptypez=maxaptype
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s3a=0.
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nsave=0
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endif
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naptype=maxaptype
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call timer('sync_q65',0)
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call sync_qra65(iwave,ntrperiod*12000,mode65,nsps,nfqso,ntol,xdt,f0,snr1)
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call timer('sync_q65',1)
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! Downsample to give complex data at 6000 S/s
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call timer('down_q65',0)
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fac=2.0/nfft1
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c0=fac*iwave(1:nfft1)
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call four2a(c0,nfft1,1,-1,1) !Forward c2c FFT
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c0(nfft2/2+1:nfft2)=0. !Zero the top half
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c0(0)=0.5*c0(0)
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call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT
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a=0.
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a(1)=-(f0 + mode65*baud) !Data tones start mode65 bins higher
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call twkfreq(c0,c0,ntrperiod*6000,6000.0,a)
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call timer('down_q65',1)
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jpk=(xdt+0.5)*6000 - 384 !### Empirical ###
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if(ntrperiod.ge.60) jpk=(xdt+1.0)*6000 - 384 !### TBD ??? ###
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if(jpk.lt.0) jpk=0
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xdt=jpk/6000.0 - 0.5
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LL=64*(mode65+2)
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NN=63
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call timer('spec_q65',0)
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call spec_qra65(c0(jpk:),nsps/2,s3,LL,NN) !Compute synced symbol spectra
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call timer('spec_q65',1)
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do j=1,63 !Normalize to symbol baseline
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call pctile(s3(:,j),LL,40,base)
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s3(:,j)=s3(:,j)/base
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enddo
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LL2=64*(mode65+1)-1
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s3max=20.0
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do j=1,63 !Apply AGC to suppress pings
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xx=maxval(s3(-64:LL2,j))
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if(xx.gt.s3max) s3(-64:LL2,j)=s3(-64:LL2,j)*s3max/xx
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enddo
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! Call Nico's QRA64 decoder
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call timer('qra64_de',0)
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call qra64_dec(s3,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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call timer('qra64_de',1)
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if(irc.lt.0) then
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! No luck so far. Try for an average decode.
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call timer('qra64_av',0)
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s3a=s3a+s3
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nsave=nsave+1
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if(nsave.ge.2) then
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call qra64_dec(s3a,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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if(irc.ge.0) irc=100*nsave + irc
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endif
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call timer('qra64_av',1)
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endif
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snr2=snr2 + db(6912.0/nsps)
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if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
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decoded=' '
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if(irc.ge.0) then
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nsave=0
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s3a=0.
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call unpackmsg(dat4,decoded) !Unpack the user message
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call fmtmsg(decoded,iz)
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if(index(decoded,"000AAA ").ge.1) then
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! Suppress a certain type of garbage decode.
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decoded=' '
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irc=-1
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endif
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nsnr=nint(snr2)
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call this%callback(nutc,sync,nsnr,xdt,f0,decoded, &
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irc,qual,ntrperiod,fmid,w50)
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else
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snr2=0.
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nsnr=-25
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!### TEMPORARY? ###
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call this%callback(nutc,sync,nsnr,xdt,f0,decoded, &
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irc,qual,ntrperiod,fmid,w50)
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!###
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endif
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! write(61,3061) nutc,irc,xdt,f0,snr1,snr2,trim(decoded)
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!3061 format(i6.6,i4,4f10.2,2x,a)
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return
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end subroutine decode
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end module qra65_decode
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