Background:

• Getting ready for the jun19 heating campaign.
• A loose/bad cable from tx4  rf output coupler to control room was repaired. We were probably reporting incorrect power levels (reporting too low) previously,
  

What we did:

• The mesh was in the 5 MHz position
  
• we transmitted at 5.125 MHz rcp.
• The 430tx ran at 1.2 MW clp with 440 usec rf pulse and 10ms ipp
• echotek data at [5.5,9.5] and usrp data taken.
• raw data deleted after movie made
  
• interim correlator was not run.
  
• 
  
• 10:30 430tx up around 1.2 MWatts
  
• 10:35 start bringing up hf tx.
• 12:30 bring tx up to 75 KW/tx
• 12:55  80 KW/tx ..  arcing..
• 13:10  bring down  430tx, leave hf up. go under the dish looking for arcing
• found main cable td cable arcing at base near td12. carlo tried to short around the arcing area with some wire
• 14:00  430tx back up.]
• 14:12  tried some auto toggling to generate an enhanced line. no luck, fof2 too low.
  
• 14:30  done
  

HF output power

Plots showing hf tx drive and output power (.ps) (.pdf)

• page 1:
• Top: hf rf coupler output vs hour of day
• Each color is a different tx.
• middle: output power in KW
• bottom: synth drive amplitude (in dbf)
• page 2: hf drive power vs hf output power
• the output power (in KW) vs input drive power (in dbf) is plotted for each tx.
• values that lie below the trend, occur when an rf off occurs during a spectrum analyzer power average.
  
• 
  

• dbf Drive for 50 KW output.. 5MHz

  tx	dbf drive
  1	-6
  2	-11
  3	-9
  4	-14
  5	-6
  6	-9

  
  

Generator power vs hf output.

    The data from the 3 running generators was used to measure how much generator power was needed to drive the 6 hf transmitters.

Generator output power vs hf output power (.ps) (.pdf)

• Top: generator output power vs time.
• middle: total rf output from 6  hf tx
• bottom: gen power vs hftx output power

Summary:

• fof2 remained below 5.125 mhz for entire run
• had some bad arcing. You could make it go away by turning off 1 or 2 of many hf.. so probably a total power problem
• found main cable td cable close to td12 arcing at base. carlo put a short around it.
• Using rf meter we were getting 60milliW/cm^2 close to arcing cable. All other cables had less that 1mW/cm^2
  
• so this is a good test to if a cable might be close to arcing..
  

home_~phil