mirror of https://github.com/saitohirga/WSJT-X.git
36 lines
1.0 KiB
Fortran
36 lines
1.0 KiB
Fortran
subroutine qra64b(nutc,nqd,ikhz,mousedf,ntol,xpol,mycall_12,hiscall_12, &
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hisgrid_6,nwrite_qra64)
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parameter (NFFT1=5376000) !56*96000
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parameter (NFFT2=336000) !56*6000 (downsampled by 1/16)
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complex cx(0:NFFT2-1),cy(0:NFFT2-1)
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complex ca(NFFT1),cb(NFFT1) !FFTs of raw x,y data
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logical xpol
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character*12 mycall_12,hiscall_12
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character*6 hisgrid_6
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common/cacb/ca,cb
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open(17,file='red.dat',status='unknown')
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df=96000.0/NFFT1
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k0=(ikhz-75.170)*1000.0/df
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nh=nfft2/2
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fac=1.0/NFFT2
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cx(0:nh)=ca(k0:k0+nh)
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cx(nh+1:NFFT2-1)=ca(k0-nh+1:k0-1)
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cx=fac*cx
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cy(0:nh)=cb(k0:k0+nh)
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cy(nh+1:NFFT2-1)=cb(k0-nh+1:k0-1)
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cy=fac*cy
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! Transform back to time domain with sample rate 6000 Hz.
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call four2a(cx,NFFT2,1,-1,1)
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call four2a(cy,NFFT2,1,-1,1)
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! write(67) nutc,cx,cy
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call qra64c(cx,cy,nutc,nqd,ikhz,mousedf,ntol,xplo,mycall_12, &
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hiscall_12,hisgrid_6,nwrite_qra64)
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close(17)
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return
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end subroutine qra64b
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