Background:

• The hf test was in preparation for the hf campaign starting on 13mar17.
• We needed to measure the phasing for herb and franks 8 mhz linear pol experiment.
• We did the measurement, but we used the incorrect starting values.
• 
  

What we did:

• The datataking was single beam. I think we only took usrp data.
  
• 09:00  the mesh was down. spent about 2 hours raising it.
• 11:00 start coming up, but then stopped to switch 430 tx to generator.
• 11:45 back up, 8.175 mhz, lots of arcing. each tx had about 35 KW.
  
• 12:10  430 tx back up.
• 12:36  try moving ch za to see if arcing goes down.. 0-> .5 deg za
• 12:38  ch za .5 -> 1 deg
  
• 12:39  ch za 1. -> 1.5 deg   .. didn't make any difference in the arcing.
• 14:34   loaded synth values for linear. to test the phasing
• 14:47   update synth phase values. output to linear_8mhz_3mar17.hfsynth
• 15:00 start measuring relative phase
  
• Phase was measured relative to tx 5.

• tx	Pwr KW	req Phase deg	used deg	measured
  1	55.7	276.4	266.4	277
  2	51.8	54	9.	54.2
  3	53.4	342.6	310.6	-17.3
  4	48.7	348.5	317.5	-11.7
  5	ref
  6	49	158.2	125.2	158.5

   
• NOTE: later we learned that we used the wrong starting values for the phase. (see 17mar17..)
  
• 15:38  done
  
•  
• 
  

Plots of output and drive power

The plots show the measured output power, drive levels used (.ps) (.pdf):

• Top: measured output  power (from coupler) in dbm
• middle : output power converted to KW
• bottom: drive level  (in dbf).

Plasma line movies

    Plasma line movies were made from the from the usrp (25Mhz bw at 430).

links to the movies

Summary:

• We had lots of arcing
• The 8 MHz phase was measured for the linear pol experiment (but we used the wrong starting values).
  
• see x101/170317/franklin.pro for how the linear phase was computed correctly..
  

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