Introduction:

Testing sequence: (top)

• the anristu was run (via anacom prog) to monitor the rf coupler outputs through the rf port switch
• we recorded in files:
• /share/phildat/hf/151102/hf_xxxxx.x.dat
• /share/phildat/hf/151102/hfa_xxxxx.x.dat 
  
• The switch to hfa_ occurred when we moved from rcp to lcp phase adjust
  
• Important note:
• (the program only allowed -11 db as external atten.. fixed next day. we actually had -10.5 db
  
• So all of the values recorded in file are .5 db low
  
• we started with the 430 xmiter on, but it had problems, so it was turned off.
• Monitoring through the telescope used the interim correlator (25 MHz bw, 1 sec dumps).  Data was recorded in files corfile.02nov15.x101.1  .. .2  :

• time	nsecs	file	scan 530600xxx	ch/dome	notes
  15:38:04- 15:41:00	177	1	108	dome	430 tx on ignore
  15:44:48 - 15:50:54	360	1	109	dome
  15:51:20 - 15:52:14	54	1	110	ch
  15:52:21 - 16:16:22	1441	1	111	ch
  16:17:22 - 17:26:39	4157	1	112	dome
  21:12:14	1907	2	113	dome	zaswing 15-2-15
  21:22:22	1803	2	114	ch	zaswing 0 to 15
  22:14:51	84	2	115	ch	za swing 15 to 0
  22:17:08	2154	2	116	dome	az swings

• the transmitter sequence was:
• bring each transmitter up  to full power then back down
• bring all of the transmitters up together
• adjust tx phase
• rcp. requested phase:[90,360,330,60,30,300]
• lcp . requested phase:[270,0,30,300,330,60] (anritsu files hfa_xxx started here
  
• all the meter values were recorded (using lcp phasing)
• record rf monitor ports for each transmitter onto the scope (and memory stick).
• lcp full power was being used.
  
• Started corfile.02nov15.x101.2
• za swing dome 15->2->15 recording on dome. fixed az (348)
• ch za swing 0->15 record with ch
  
• tx1 tripped reverse power
• tx2 tripped drv A fault
• reset
• tx1 tripped again reverse power
• lower tx1 rf drive by .5 db
  
• ch za swing 15 -> 0. record with ch
  
• azswing 348->708 and back and forth.
  
• dome =15deg, ch=0, record with dome
• (note 348-372 rf was off for start of first swing.
• shutdown
  

rf synth levels and totpwr from ch receiver. (top)

     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.

• 15.5 to 23.5 hrs (.ps) (.pdf)  entire run
• Top has synth drive, rfon/off, and ch/dome total power (in red)
• between 16.7 and 21.3 hours there was no ch,dome tp data taken..
• bottom: tx phase.
  
• blowup of particular events (.ps) (.pdf)
  
• page 1: 15.5 to 17.2 
  
• bring each tx up and then back down.
• bring all the tx up together (starting at 16.7)
• the red (tp)  was switched from ch to dome around 16.12 hrs
  
• page 2: 21.2 to 23.5 za swings and azswing
•  the first part has the ch and dome za swings
• the latter part (with lots of rfi/bursts) is the azimuth swings
  

Output power vs dbf drive.

• Each transmitter was brought up by itself (and then brought back down).

tx meter values recorded.

tube monitor ports. (top)

• the tube stage outputs for all 6 transmitters were recorded (see tube stage outputs for 151102)
• Tx 5 still has low gain on the driver stage
• stage 5 broad band data was taken with 1 M ohm termination rather than 50 ohms..
• Tx 4: i forgot to save the screen image.
  

Summary (top)

• Amplitude and phase calibration at full power for each polarization (on sky)

• tx	rcp (1)					lcp(2)
  	phase (deg)				amp (dbf)	phase (deg)				amp (dbf)
  	theory	used	measured	delta		theory	used	measured	delta
  1	90	106	91.8	-14	-6.2 -6.7(3)	270	287.7	269.5	-17	-6.5 -7.0(4)
  2	0	0			-7	0	0			-6.5
  3	330	345.5	329.7	-15	-4.9	30	48	29.9	-18	-3.7
  4	60	57	62	5	-6.4	300	292	300.6	9	-5.5
  5	30	72.5	29.8	-12	-2.0	330	16	330.3	46	-2.3
  6	300	297	299.5	-2	-5.7	60	60	60.1	0	-5.0

• Notes:
• (1) saved in file rhcp_2.hfsynth (tx1drive may be .5 db high)
• (2) saved in file lhcp_2.hfsynth.
  
• (3) tx1 phase was measured at -6.2 dbf drive, after the adjustment, the output power rose to 17.1 dbm(98Kw) so we backed off to -6.7 dbf.. this should be the value used to drive rcp (the file may have the higher (-6.2dbf value)
• (4) tx phase was measured at -6.5 dbf, after adjusting it rose to above 17.dbm so we backed off the drive by .5 dbf to -7.0. this is the value that should be used.
• Azimuth, za dependence of the noise bursts:
• the strength of the noise bursts repeat with azimuth and za.
  
• for az=348 (dome) the bursts are strongest at za 2 to 7 degrees za
• with the dome at za=15 degrees the strongest noise bursts are:
• az=20 to 120deg
• az=170 to 300
• there must be some spatial reason for this...
  
• how the mesh is hung?
• placement of the dipoles
• tiedown cables?
• This does not mean that the transmitters don't also have a time dependence with the bursts
• but the bursts have to be close enough to repeat with the azimuth,za motion
• and there is a strong az,za dependence of the noise getting into the receiver.

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