Notes from run at Goldstone  2/24/00 -- 2/25/00
observers: PG, KL, CN, DS

Highlights:

  *  moved to RARG building and started filling our permanent rack space

  *  tested long cables and found RG-214 used for S-band for DSS14
was inadequate.  Another cable run (type ???) appears better and will be
used.    Chuck will investigate installing the final 40' to our rack and
the 150' on the other end.  Cable delay for long cables (including 40' back
and forth to rack) was  1.01 usec.

  * Using "holdoff" on oscilloscopes prevented misalignments of triggers
with events.

  * Observed ground-loops that can probably be solved with LP (10MHz) filters.

  * 3C273 observed with 5-sigma significance in cross correlation plot.


  *  A second quasar we attempted was 4C73.18.  No fringes were seen with 
the same  integration interval as used for 3C273.  The detection was expected 
to be marginal.  A recording was made with a longer integration time 
but it has not been processed yet.  By restricting the delay range to 
search over the processing time can be greatly reduced.
  * (attempted to observe another quasar--I don't have the run sheet,
fill in info here.)

  * Observed that IF distribution amplifiers looked like they were
driven into saturation by large pulses.

  * Found that new piezo-electric lighters were not strong enough to make
a trigger.

   *  Another piece of data is that when one scope output is used to 
trigger a second scope the delay is 1.54 microseconds.  It is 
possible that this number is dependent on the horizontal sampling 
rate.

  * Wish-list to establish automatic system.

     1. IEEE controlled attenuator box  (3 channel)
     2. QTY=3 pulse generators  HP8110A
     3. QTY=2 gate generators ("gated photon counters") SR400
          (stanford research systems)
     4. NIM bin
     5. QTY=2 NIM scaler modules
     6. QTY=2 NIM-TTL converter modules
     7. 512k additional memory for SUN ultraspark 5
     8. Fiber delay line (QTY=2 500 usec, QTY=2 1000 usec, QTY=2 1500 usec,
depending on costs)
     9. QTY=4 Low pass filters (10 MHz)
     10. Larger assortment of cable assemblies.
     11. Trigger 'scope.


  * Other things to bring with us next time:

     1.  cable ties
     2.  short cable assemblies
     3.  project box, hand drill and panel-mount bnc connects to reduce rack
space currently used for trigger system.
     4.  rack mount hardware for scope


  * Need a check list for start of "pass"
(We should make a "pass-sheet" in addition to run-sheets.)

    1. Check no saturation of IF distribution amplifiers.
    2. How to turn on trigger system (sequence):
         a) Connect loads
         b) disconnect inputs to SR400's
         c) Turn on +24V (blue=+, black=gnd)  Draws 0.97 amp
         d) connect SR400 inputs
         e) remove loads

* Other action items

    1. Solve internet access problem with Sun.
    2. Investigate using single-scope DAQ (with another for trigger)
    3. Investigate using shorter/fiber based cabling:
        - check with Mike Klein about getting high-bandwidth LNA outputs
        - check on price of Ortel system
        - can we use existing bins for power?
    4. Write out binary files instead of ascii
    5. Add trigger position to log sheet

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