Introduction:

Testing sequence:

• Data was recorded from the ch receiver using the interim correlator
• the telescope was parked at:
• gr az=285, fch az=105,  ch za=8.8, ch dome=11.
• We phased the array using the file:  rhcp_2.hfsynth (rhcp).
• 09:30  -started to bring up all tx
• 10:44  pulsing start: 1 on ,2 off
• then we ended up aborting rf syn gui
  
• 11:41  pulsing start: 1 on, 2 off
• 11:46  pulsing stopped.. used 5 minute timed pulsing sequence
• 12:12  stopped
  

rf synth levels and totpwr from ch receiver.

     The log file from the gui driving the rfsynth was input and plotted  vs hour of day.  The  plots contain:

• amplitude (db below full scale). Each tx in has a separate color.
  
• the phasing used
  
• The total power (computed from the 25 MHz,, 1 sec interim correlator dumps) was over plotted (db above Tsys .. with an offset for display)
  
• The dashed green line shows when the rf was cycled on and off.

• Page 1: entire run: 9:30 to 12:12
  
• Top antenna drive (db full scale).
• The red line shows the ch power (db scale)
• bottom: phase for each tx.
• This was right hand circular. we did not change the phase during the run
• Page 2: blowup of 11.2 to 12. hours
• lots of arcing around 11.94 hrs.
  

carriage house spectra and dynamic spectra

over plotting the spectra:

   25 MHz 1sec dump spectra were taken with the interim correlator during the entire run.
The long range receivers were selected.

ch spectra 11.8 to 12.2 hours (.pdf)

• the harmonics of 5.125 MHz are flagged.
• The harmonics did not appear at the expected frequencies...they are about 1 mhz low at 430
• that implies that we were transmitting 1/84 = 12Khz  or 5.113 Mhz.
  
• pol A and polB where averaged..
• the elevated spectra are from 11.94 hours.
  

dynamic spectra 10.7 to 12.2  hours

    The first image shows the dynamic spectra scaled to 5 sigma (.gif)

• the horizontal lines around 10.8 was when we were pulsing 1 on , 2 off.

rf drive and output power. tx output stability.

    The rf drive  and total output power (KW) where plotted for the 3 hour run (ps) (.pdf)

• Each transmitter is plotted in a separate frame
• The black line is the kilo Watt output power (as measured from the rf coupler).
• the red line is the rf drive  (linear scale).
• I scaled it so that the maximum output value we used was 80.
  
• The green and blue lines are pulsing on and off.
  


• Page 1:
  
• top tx 1
• middle tx2
• bottom: tx3
• Page 2:
• top: tx4
• middle: tx5.
• bottom: tx6
• Note that when the pulsing finished, the output power increased (to above 100kw)
• it dropped down as the tx warmed back up.
• tx 4 didn't show this because i rapidly dropped the drive (the reflected power was pushing 10.5kw)
  

Summary

• drive when at max power (11.6 hours before final pulsing set).
  

• tx	rf drive		xmitted power
  	drive  dbf	phase deg	rf coupler	KWatts
  tx1	-5.7	106.0	16.8	85
  tx2	-7.3	0	16.2	78
  tx3	-4,1	345.5	16.2	78
  tx4	-5.1	57	16.3	80
  tx5	-2.5	72.5	15.5	66
  tx6	-6.4	297	16.0	74

  
  
• These values are in rhcp_160531.hfsynth on ~hf of hfctrl.
• Saw a large change (20%) in output power when pulsing (1 on , 2 off) was stopped (while drive remained constant).
  
• this was during the day with the room tx building very warm.
• When pulsing started we could feel the change in temp (it was cooler)
• the jump in output returned to the previous value in about 2 minutes.
• 
  

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