mirror of https://github.com/saitohirga/WSJT-X.git
82 lines
2.1 KiB
Fortran
82 lines
2.1 KiB
Fortran
subroutine hopping(nyear,month,nday,uth,mygrid,nduration,npctx,isun, &
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iband,ntxnext)
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! Determine Rx or Tx in coordinated hopping mode.
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character*6 mygrid
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integer tx(10,6) !T/R array for 2 hours: 10 bands, 6 time slots
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real r(6) !Random numbers
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integer ii(1)
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data n2hr0/-999/
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save n2hr0,tx
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call grayline(nyear,month,nday,uth,mygrid,nduration,isun)
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ns0=uth*3600.0
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pctx=npctx
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nrx=0
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ntxnext=0
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nsec=(ns0+10)/120 !Round up to start of next 2-min slot
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nsec=nsec*120
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n2hr=nsec/7200 !2-hour slot number
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if(n2hr.ne.n2hr0) then
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! Compute a new Rx/Tx pattern for this 2-hour interval
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n2hr0=n2hr !Mark this one as done
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tx=0 !Clear the tx array
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do j=1,10 !Loop over all 10 bands
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call random_number(r)
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do i=1,6,2 !Select one each of 3 pairs of the
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if(r(i).gt.r(i+1)) then ! 6 slots for Tx
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tx(j,i)=1
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r(i+1)=0.
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else
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tx(j,i+1)=1
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r(i)=0.
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endif
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enddo
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if(pctx.lt.50.0) then !If pctx < 50, we may kill one Tx slot
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ii=maxloc(r)
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i=ii(1)
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call random_number(rr)
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rrtest=(50.0-pctx)/16.667
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if(rr.lt.rrtest) then
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tx(j,i)=0
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r(i)=0.
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endif
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endif
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if(pctx.lt.33.333) then !If pctx < 33, may kill another
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ii=maxloc(r)
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i=ii(1)
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call random_number(rr)
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rrtest=(33.333-pctx)/16.667
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if(rr.lt.rrtest) then
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tx(j,i)=0
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r(i)=0.
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endif
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endif
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enddo
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! We now have 1 to 3 Tx periods per band in the 2-hour interval.
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endif
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iband=mod(nsec/120,10) + 1
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iseq=mod(nsec/1200,6) + 1
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if(iseq.lt.1) iseq=1
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if(tx(iband,iseq).eq.1) then
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ntxnext=1
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else
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nrx=1
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endif
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iband=iband-1
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! write(*,3000) iband,iseq,nrx,ntxnext
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!3000 format('Fortran iband, iseq,nrx,ntxnext:',4i5)
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! write(*,3001) int(tx)
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!3001 format(10i2)
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return
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end subroutine hopping
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