!   Example schedule for VLBA and Mark IV observations
!    with 512 Mbps recorded bit rate.  This uses 2 tape
!    drives on the VLBA and 2 heads on MKIV.
!
!   Adapted from egiv.key 11-July-1997
!   egiv.key Provided by Huib vanLangevelde  5-Feb-1997.
!
!   Control code and print requests
!
overwrite
sumitem=el1, el2, tape1, tape2, early, dwell
optmode = scans
opminant = 1
!
!   Proposal specific
!
expt     = 'Sample that generates 512 Mbps recordings.' 
expcode  = 'eg512'
version  =  2
piname   = 'Huib van Langevelde'
address1 = 'JIVE, Radiosterrenwacht Dwingeloo'
address2 = 'Postbus 2, 7990 AA Dwingeloo'
address3 = 'the Netherlands'
phone    = '+31 521 595 220'
obsphone = '+31 528 221 273'
fax      = '+31 521 597 332'
email    = 'huib@jive.nfra.nl'
obsmode  = 'VLBA/MKIV'
obstype  = 'VLBI'
note1    = ' '
!
!  end tape initialization stuff
!  begin correlator
!
correl   = 'Socorro'
coravg   = 4
corchan  = 16
cornant  = 10
corpol   = 'on'
corwtfn  = 'uniform'
corsrcs  = 'standard'
cortape  = DAT
corship1 = 'Huib van Langevelde'
corship2 = 'JIVE, Radiosterrenwacht Dwingeloo'
corship3 = 'Postbus 2, 7990 AA Dwingeloo'
corship4 = 'the Netherlands'
cornote1 = ' '
!
!  Put a setup here.
!
setinit = eg512-256 /
!  The 256 Mbps mode for this example.  
!  This is all that is needed.
! modetest
nchan    = 8   
bits     = 2
bbfilter = 8.0  
pol      = DUAL
netside  = U
freqref  = 4990.99
freqoff  = -19.50, -19.50, -11.50, -11.50, -3.50, -3.50, 4.50, 4.50  /
endset /

setinit = eg512-512 /
!  The 512 Mbps mode for this example.  
  nchan    = 8
  bits     = 2
  bbfilter = 16.0
  freqref  =   4990.99
  freqoff  =  -32.50, -32.50, -16.50, -16.50,  -0.50,  -0.50,  15.50,  15.50
  netside  =  U, U, U, U, U, U, U, U
  pol      = dual
  /
endset /
!
!
!  Ready to start
!
year   = 1997
month  = 3
day    = 4
start  = 12:00:00 
!
!
 stations = vlba_hn, vlba_sc, gbt_vlba

!  Start with 256 Mbps to be sure that the slower rate
!  in an observation that contains 512 Mbps works correctly.
!  In this circumstance, both drives should be used, but
    !  Long time for postpasses and tape change.
!  at 8 Mbps/track.

!  Information note:
!  This file produced an example of the kind of weird and 
!  wonderful things that can happen with tape handling.
!  In the eg512-256 mode, there are two scans of 22 min each
!  in each pass.  Without a slew, the gap is 10 seconds set
!  by MINSETUP for GBT_VLBA.  That is long enough that the
!  tape would not stop between scans.  But when there were
!  7 scans on 3C454.3, the long slew to 3C84 happened in
!  the middle of a tape in a reverse pass.  Thus the tape
!  after the next scan was positioned 10 seconds in from the
!  start.  When the second scan of that pass, which also 
!  needed an extra 10 seconds, it looked like it would go
!  too far beyond the end of tape (there is a tolerance, but
!  it was exceeded).  Therefore, the tape reversed after
!  one scan.  This pattern kept up for a while, wasting half
!  of many tracks and requiring a premature tape change.
!  Here I have fixed the problem by causing the slew to 
!  happen at the tape end.  Other correction schemes could
!  be done by adjusting the scan lengths down a bit or by
!  changing MINPAUSE or PRESTART.

setup = eg512-256
repeat 8 source = '3C454.3'   dwell = 22:00   /
repeat 6 source = '3C84'      dwell = 22:00   /

!  Readback tests take up to 4 min in 512 mode.

gap = 4:00
repeat 4 source = '3C84'      dwell = 22:00   /
gap = 0
repeat 3 source = '3C84'      dwell = 22:00   /
repeat 3 source = '3C84'      dwell = 22:00   /
repeat 4 source = 'J0508+84'  dwell = 22:00   /

!  This is where the tape change should occur.  Allow lots
!  of time.  Then start up at the full 512 rate.  Users will
!  mostly just use the 512 rate.

gap 50:00
setup = eg512-512
repeat 1 source = 'J0508+84'  dwell = 22:00   /
gap 4:0
repeat 6 source = 'J0508+84'  dwell = 22:00   /
gap 0
repeat 7 source = 'J0508+84'  dwell = 22:00   /