WSJT-X/lib/makepings.f90

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subroutine makepings(pings,npts,width,sig)
real pings(npts)
real*8 t
real t0(14)
iping0=-999
dt=1.0/12000.0
do i=1,14
t0(i)=i !Make pings at t=1, 2, ... 14 s.
enddo
w=width
amp=sig
do i=1,npts
iping=min(max(1,i/12000),14)
t=(i*dt-t0(iping))/w
if(t.lt.0.d0 .and. t.lt.10.0) then
fac=0.
else
fac=2.718*t*dexp(-t)
endif
pings(i)=fac*amp
enddo
return
end subroutine makepings