All Measurements:

• 230726  a4002 3ghz rfi 1-9 jul23
  
• 230714  testing the cameras at the 12meter with the cooled receiver.
  
• 230627: comparing noise and radar pshifts when taking 3GHz pulsar data
  
• 230627  a4005 sees instability in upper portion of 9103 Mhz band (probably 8730-9000 Mhz rfi)
  
• 230615  B0329+54 pulsar showed lots of extra rfi in polb. probably 16 bit saturation.
  
• 230613  shimming the horn to find the wb focus
• 230606  3ghz az swings. el=6,10,20..80 deg
  
• 230530  25,29 may23.. step cal 2.7 to 12. Ghz. plotting TcalOn/Tsys.
  
• 230518  updated rcvr chain tsys contributions. added straight thru with a 15 db pad.
  
• 230517  azswings with field fox at filter box output on telescope.
• 230518  measured power levels at coupled output before the fiberOptic transmitter. Straight thru mode is saturating.
• 230516    dewar cooldown on the telescope.
• 230515   sparameters for fiber optic chassis in pedestal, cable loss dewar to filter box
  
• 230502  added xband s2p measurements to filter, and filter box.
  
• 230426  rcvr chain levels. updated 0-14ghz lopass filter in filterbox, added set using xband cables.
  
• 230414  s-parameters for filter box as a unit.
  
• 230413  remeasured cable loss in sband cables lna to pedestal.
  
• 230412  cooled wide band receiver chain levels.
  
• 230405  S-parameters for filters in filterbank.
  
• 230331  Trcv remeasured after dewar mods.
  
• 230329  pset  error time outs  caused by disc io slowdown.
• 230328  re-measured s-parameters wbrcvr cal input to lna output after cal cables replaced.
• 230328  removing linear baselines before 2d gaussfits on crosses.
• 230328  dewar monitoring box rfi measured in screen room after osvaldo worked on it.
  
• 230306  rfi measurements of filter bank box in the screen room.
• 27feb23 summary of 8730 to 9100 MHz  rfi.
  
• 16feb23  solar attenuator increases xband Tsys.
  
• 10feb23  measured s-parameters wbrcvr cal input to lna output
  
• 31jan23  remeasured Trcv 4-14 GHz with preamp on.
  
• 30jan23  xband sidelobes using 3C405 from the jun22 crosses.
  
• 25jan23  Treceiver for 12m wideband  dewar measured at antenna test building
  
• 11jan23  first rfi test of dewarmonitor box in the screen room.
  
• 28nov22  nov22 processing of 60hz data showed jump in freq when cal box removed, reinstalled.
• 18nov22  testing voltage sampling at sband looking at siriusXm signal.
  
• 10nov22  more sband calbox tests. reverse cal cables, reverse bias cables.
• 09nov22 sband polB. check calbox for 120hz saturation.
  
• 04nov22 sband polB has 120 hz saturation when cal fiber box in pedestal disconnected.
  
• 03nov22 sband rms/freqChan for first rec of pulsar sources. added apr22-jul22
• 02nov22 sband dynamic spectra of pulsar B1641-45 showed dispersed signal in polA (probably instrumental)
  
• 02nov22 tested new camera on top of 12meter control building.
  
• 27oct22  Sband polB shows variation in the  ripple across the bandpass.
  
• 27oct22  added sband tsys movies using pulsar cal files.
• 26oct22  azimuth swing shows no az dependence of 60Hz seen in sband polb.
  
• 21oct22  sband spectra at input to the postamp chassis  (before rf filter)
  
• 13oct22 problems with pulsar observing with sb corresponds to 60hz in polB.
  
• 06oct22  Fit for Tsys contribution from atmosphere using 20sep22 tipping scans.
• 02oct22  dispersive signal seen in polA of B1641-45 pulsar observation.
  
• 28sep22 2d crosses 25-27jun22 done after sb/xb receiver reinstalled. Fits to Tsys, gain,sefd.
  
• 08sep22 using jun22 crosses compare 2dgaussfits to casA, cygA to get the extended src Correction for casA.
  
• 31aug22  rfi test stationary surveillance camera on 12meter control building roof.
• 30aug22  look at rfi in 30aug22 low elevation azswnings.
  
• 30aug22  redo azswings at low elevation after brush cleared to see improvement in Tsys.
  
• 26aug22  testing from from surveillance camera located at the 12meter pad.
  
• 24aug22  testing rfi from surveillance cameras on tower by visitor center hill.
• 19aug22  test rcvr stability using on,off position switching with winking cal.
  
• 19aug22  added azimuth dependence of rfi from the qrfh 2-12 ghz measurements.
  
• 12aug22  xband az swings done at low elevation.
• 12aug22  testing the qrfh horn on 12meter. on,off position switch and cross on the sun
  
• 06aug22:  look at ratio of cal deflections for each sun map to check electronic gain stability
• 28jul22  added qrfh spectra measured with no hipass filter for 21jun22 data.
  
• 27jul22  monitor tsys with hardware winking cal data.
  
• 21jul22  xband cygnus mapping sees saturation from rfi at 8732 to  8968 MHz.
  
• 14jul22  testing the QRFH on the 12m meter (jun22).
  
• 26jun22  xb 4% totPwr dip that lasted for 400 seconds.
  
• 24jun22  measured sband cal diodes after cal attenuators changed.
  
• 24jun22   measured xband cal diodes after cal attenuators changed.
  
• 21jun22   measured power levels with wideband QRFH on the telescope.
  
• 07jun22   measured xband cal after new diode installed in peltier cooler.
  
• 07jun22    measured sband  cal after diode moved to peltier cooler.
  
• 27may22  measure sband cal value (before temperature compensation)
  
• 26may22   links to ben's plots of the processed timing runs.
  
• 24may22   pulsar dynamic spectra and rms/mean by freq channel movies
• 12may22  xband az swing using azstep routine. 8319-8349 MHz rfi
• 05may22  xband crosses done on 3C144, 3C461 with cal
  
• 04apr22     sband system performance from crosses (but no cal)
• 04apr22    az strip through 3C405 for sband and xband.
  
• 23mar22    12meter postamp chassis power levels on,off the sun (sband section, and foTx)
  
• 22mar22 sband azimuth swings looking at rfi.
• 18mar22  cable loss sband cables lna to postamp chassis.
  
• 16mar22 15 minutes of winking cal to remove gain variations.
  
• 11mar22  felix measured s-parameters for sband portion of postamp chassis.
  
• 11mar22 measure sband spectra,power levels in postamp chassis after new sb filter installed.
• 09mar22  S-parameters for new sband filter.
  
• 02mar22 Correct for rcvr gain variations with winking cal.
  
• 28feb22  diagnostics from 9,14feb22 recombination line measurements.
  
• 09feb22  recombination line measurements (includes 14feb22)
  
• 21jan22  azswing -180 to 360 and back with el=60 showing az motor torques.
  
• 17jan22 measured xband cal values using sky and absorber.
  
• 11jan22  08jan22: B0833-45 pulsar obs.  all bands have normal power.
  
• 11jan22  05jan22: B0329+54, B0833-45 pulsar observation. low power 2 bands for B0833-45
  
• 11jan22  03jan22: observation of B0329+54
  
• 11jan22  31dec21: observation B0329+54. rain 1/2 way through obs. 25% jump, slow return to normal.
  
• 02jan21  xb psr data (vela,B0329+54) taken on 17dec21.
  
• 23dec21 cal spectrum and fit using winking cal on blank sky (data taken 07de21)
  
• 07dec21 spectra, total power measurements with with sband signal installed in system.
  
• 24nov21 check if if/lo, mock spectrometer compress while looking at the sun.
• 18nov21  make map of sun. Look at strips through the center to if there is compression.
  
• 22nov21 measured power levels on,off sun in pedestal and fiber.
• 19nov21  linearity test of the udc.
  
• 10nov21 calOn,off for 26 hours after temperature controlled cal installed.
  
• 01nov21 measure dynamic range in udc while tracking the sun. polB compresses
• 29oct21  12m xband. plot ratio sefdPolB/polA for 9sep21 model data.
  
• 28oct21  xband sefd from model4A  crosses.
• 31sep21  xb miteq lna gain measured in lab.
  
• 24sep21  measure tsys vs elevation at different azimuths
  
• 19sep21  monitor  xb rcvr for 12 hours (lots of rain). specta results and standing wave.
  
• 19sep21 monitor xb rcvr for 12 hours (lots of rain). total power results.
  
• 23jul21   01jul21 16 hrs of data. Look at spectra and spectral ripples.
• 07jul21:  track sun for 1 hour with 2ms sampling. 2 sec total power dropouts.
  
• 06jul21:  m42a recombination lines: 14 5 min on,offs
  
• 01jul21:  monitor xband for 17 hours. PolA jumps and drifts with freq. polB stable.
  
• 24jun21: remove xb hub amps, then calon,off on,off sun as well as scan across the sun.
  
• 17jun21: do calon,offs while tracking the sun, and then off the sun.
  
• 11jun21: measure lna output  while looking at blank sky
  
• 08jun21: track blank sky for 7 hour firing cal. PolB going into compression.
  
• 02jun21: mock bandpasses used for 12m total power measurement (may/jun).
  
• 02jun21: monitor xb rcvr for 4 hours while connected to the cal diode. Track a position to check vibrations.
  
• 01jun21: monitor xb rcvr for 23 hours while connected to the cal noise diode (no lna or sky).
  
• 21may21: monitor xb rcvr for 19 hours.
  
• 04may21: monitored xb rcvr for 19 hours.
  
• 30apr21: monitor xb rcvr for 14 hours
  
• 26apr21: 10 Hz sampling for  48 minutes. Tp vs time and tp spectra (sband terminated)
  
• 26apr21: fast sample (.238 millisecs) spectra. look at fiber optic birdie.
  
• 26apr21: measure xb spectra in hub  to see where the 3 to 8 Ghz extra  power is coming from.
  
• 22apr21: measured rfi : 0 to 1 Ghz using discone antenna at 12meter site.
• 20apr21: measure levels input to the 12meter postamp chassis (only polB)
  
• 12apr21: dump 1ms spectra to look at total power dropouts.
• 09apr21: 9 crosses on the Crab taken as xband.
  
• 07apr21: xb on/off position switch on casA shows spectra ripple in cal spectra came from cal.
  
• 24mar21: monitoring xband for4 hours. standing wave, polB noisier
  
• 07may16: fringes 305m, 12m taken 04may16
  
• 08apr16: 6 crosses on the moon to measure Tsys
  
• 06apr16: tsys vs elevation for sb, xband.
  
• 02apr16: sefd from 1d gauss fits to model 3A az,el cross strips.
  
• 31mar16:Inject tones into cal couplers. Size of cal we need.. dana's memo.
  
• 29mar16: fitting 2d gaussians to sband crosses on 3C405
  
• 13mar16: monitor xb power for 16 hrs after xb rf atten replaced. pwrjumps and ripple.
• 07mar16: sband spectra shape variation with time.
  
• 07mar16: xband total power ripple, power variation coming from inside the 12meter pedestal
  
• 28jan15: crosses on casA to verify model2A
• 04dec14: comparing cross positions using Track Array and ramp modes.
  
• 19jun12: first light
  
• 19aug11:dana's measurements of fiber phase stability. (.pdf) (.eml)
• 28feb11: rfi measurments from within the pedestal.
  
• 04feb11: plots of servo performance tests from acceptance test.
  
• 04feb11: description of dana's rf fiber test.
  
• 26oct10: measure communications time for controller.

Specs:

Schematic of system.

• dana's schematic of system (.pdf)
• Felix's last schematic of cooled rcvr (.png)
  
• filter bank (.png)
• udc (up down converter) (.pdf)
• Wide band reciever
• Felix's last schematic of cooled rcvr (.png)
• Rf over fiber (.png)
• cal box (.png)
• 12m power distribution  (.png)
  

Fiber optic output (sband not terminated)

 Measurements with power meter.

• date	PolA dbm	polB dbm	Notes
  210419	-27	-31	most of the power in 2350 birdie these levels will saturate the udc (1db compression at 35dbm)
  211207	-46	-43	15 db pads before input to postamp chassis in pedestal 15,20 db pads added between FOrcv output and udc input. measured using pwrmeter at input to udc then subrtraced pads (assumed cable loss of 0).
  220315	-52.5	-47.9	new sband filter added 11mar22. pwrmeter. used short cable from forcvr to udc (but pads 15,20db pads were not included).

spectra fiber optic output

• 220311 new sband filter installed
• 220311: blowup sband spectra at FOrcv output (.ps) (.pdf)
• more info
  
• 220315: 1-10GHz span, 1Mhz rbw, polA,B, and field fox noise floor (.ps) (.pdf)
• avg 20 sweeps, attn=0,avgDetector. Noise floor set by Spectrum Analyzer.
• processing: x101/220315/12foout.pro

Fiber tx,rx performance

• 220317: Felix measuredthe fiberOptic tx,Rx gain,NF for 2-4 GHz
  
• do measurements with a short fiber cable (spare tx,rx), and then measure using installed fiber to 12meter

• 	shortfiberCable	fiber 12mToCtrlRoom
  gain (db)	-16db	-21 db
  Noisefigure (db)	24db	28 db
  Equivalent Temp DegK	72555 K	182688 K

  
  

Equivalent noise Temperature at FO input/output for sband

•  The spectral density from the 11mar22 spectra were used to compute temperatures at the input and output of the FO tx,rx pair (for polB)
• The output temperature of the FO rcv was also computed using the measured  FO TX temp and the Gain and NF that felix measured for the device.

• location Using PolB	pwr/rbw dbm	rbw	bwDbHz	dbm/hz	equivalent Temp DegK	notes
  output diplexor	-55dbm	300Khz	54.77	-109.8	1.21e9	11mar22 spectra
  input to FO tx (after 7db pad)	-62dbm	300Khz	54.77	-116.8	152e6	just add 7db pad
  output FO rcvr					1.2e6	computed from fo tx,rx gain,NF measuremetns gain -21db ,NF 28db (152e6 + 182.687e3)*10^(-2.1)
  	-82.3dbm	300Khz	54.77	-137.1	1.4e6	measured with spectrum analyzer

•  
• The measured spectral values agree with the value computed using the input temperature and the  gain,NF of the FO tx,rx pair
• To get this same value at input to FO tx, we need an input temp to lna of about 100K.
  

udc levels

• 19nov21 udc linearity test
  

Xband power levels

210426 - power meter in pedestal and cone

• The amp numbers match the names on dana's schematic: amp2  = A2
• We used the power meter to measure the levels.
• xband : hub,pedestal
  
• lna ->20ft cable->(X1) amp2 in cone (X2) ->cable to pedestal->(X3) PostAmpChassisInp->amp3(X4)->3dbPad->Filter->5dbPad->
•           amp4(X5) ->2dbPad -> diplexor input
• see also (210426 spectrum analyzer measurements).
• --> 210629: 20db hub amps replaced with 11.5 db amps (5db noise figure)
  

• Measured Xband power levels

  location	polA dbm	polB dbm	Notes
  X1 before amp2  in hub		-37	After  20' cable from lna
  X2 after amp2 in  hub		-15
  X3 input  to postamp chassis	-26.5	-22.57	7.5 db loss  polB cable
  X4 after amp 3.		+2dbm	after 1st amp in postamp chassis(before filter)
  X5 after amp4		-8.3dbm	amp after filter, before 2db  pad and diplexor input
  diplexor input		-10.dbm	input to diplexor

• --> using totPwr from spectrum analzyer, the lna to amp2 cable loss is about 10db.
  

210621: lna output looking at blank sky

    On 11jun21 felix hooked the field fox spectrum analzyer to the output of the lna's while looking at blank sky:

•  13:07 ast, az=320, el=13.03 deg
• 3 to 11 Ghz, rbw=3Mhz, npnts=1001, vbw=3Mhz, atten=0db, preamp on , detector=pwr avg, avg 50 sweeps.
• The noise floor of the field fox with this setup is less than -85dbm across the entire band.

The plots show the measured  spectrum output from the lnas (.ps) (.pdf)

• Black is polA, red is polB
• The purple lines show the region used for the xband reciever.
• Most of the power through the front end is below this band. The question is where is this power coming from?
  
• The rectangular waveguide before the lna  module has a long dimension of 1.122 inches (wr112).
  
• Using the waveguide cut off calculators on the web, this would have a cutoff frequency of 5.269 GHz.
• I think there are many wavelengths through this piece of waveguide (the cal coupler), so it should to a good job of filtering out anything about 1.4% below this (i'm extrapolating from what our lband waveguide filters did). At 5.19 Ghz it should be down by 40 to 50 db.
• There is a much longer run of circular waveguide (horn to transition). It's cutoff will be lower than the rectangular waveguide (it also has a dielectric down its middle).
• previous measurements of lna polB output showed similar results (be careful,, black, red in avg, peak hold rather than polA, polB)
  

processing: x101/210611/12m_lnaoutput.pro

sband power levels

210426 power meter  in pedestal

• Sband: pedestal signal path
  
• lna -> cableToHup -> cableHupToPedestal->(S3)inputToPostAmpChassis->filter->(S3f)2dbPad->Amp11->3dbPad->Amp12->3dbPad->
•           Amp13(S4)->7dbPad ->diplexor input.(S5)->7dbpad-> FO xmter input
  
• Note:  measurements below do not include the 15db pads installed 07dec21 in front of the  sband rf box inputs in the pedestal .
  

• Measured Sband power  levels

  Location	PolA dbm	PolB dbm	Notes
  S3 input to postamp chassis	-29.0	-27.6
  S4 output of 3rd amp (before diplexor)		6dbm
  diplexor input		-1dbm	:q

220311 power meter in pedestal after new sband filter installed

• the 15 db pads at postamp chassis input in pedestal were removed.
• see 210426 above for signal path naming.
• Telescope pointing at az,el=10,30
• also see sband spectra 2202311
  

• location	PolA dbm	polB dbm	Notes
  output of lna in hub	-13.4	-15.72	this was done later in the day, the el was down to 7deg. the spectrum at the input to the postamp chassis saw power from 1700 to 2700 Mhz so this is wide open.
  cable loss amp to pedestal	12.5db 11.6db	12.5db 13.3db	measured 18mar22 2.0 to 2.7Ghz using S11 (more info) using power levels at lna out and postamp chassis input. These were taken at different times, az,el's so it is  approximate
  S3 input to postamp chassis	-25.0	-29.01	this is before filter so should be similar to 210426 measurements
  S3f after filter		-70	Below minimum  power level of power meter.
  diplexor input		-17.5	computed using -25.5 dbm  +7dbpad+1db diplexor
  S5 before FO xmter input		-25.5	The xband input was terminated with 50ohms at the input to the box (so this is only the sband contribution)

•  
• see also : 220311 sband postamp  chassis s-parameters.
  

xband receiver chain levels

    The parameters of the components in the xband receiver chain were used to compute the levels as you move through the chain.

• The program sysTemp (/share/megs/phil/svn/aosoft/src/gen/srcTemp.c) was used for the computation.
• If you want to play around with the parameters:
• /share/megs/phil/svn/aosoft/p12m/rcvtemp has a script to run the different configs (rcvtemp.sc)
  
• You can copy,edit the xxx.dat files to play with things.
  
• If you want to write the output to a file, then use a directory you have write permissions to.
• sysTemp should be in your path by default. If not use:/pkg/aosoft/fedora4/x86_64/bin/sysTemp
  
• 
  
• For each element the noiseFigure (or temp Kdeg) and the gain/loss was specified.
• For each step through the chain the program output.
• step name
• noise figure
• device temperature
• device gain
• cumulative gain to that input point in the chain
• Temp (degK) at the input to the device
• Tsys contribution of this element
• The output temp, system temp, and cumulative gain are then output.

Notes:

•  The actual temperature of the system is probably double the computed 52 K. This could come from
• sky = 10K. There is probably more scattered radiation input
• the feed may have some losses in it (dielectic?), bad matches/resonances, etc.
  
• the lna's may not be the quoted 41K, the match to the feed may not be great.
  

input file format

    The input file (for the original configuration) was:

# 12meter xband chain
# if possible use values 8-9ghz
#name  noiseFigure/Tsys   gain/loss db
#
sky           10K                0db
lna           41K                40db   from patriot measurements
cLnaToAmp2   -                 -10db    26apr21 spectrum analzyer measurements  8-9 ghz
hubAmp2       5db                20db   26apr21  measurement 8-9 ghz. datasheet says 18
cAmp2ToPed   -                 -7.5db   26apr21 total power measurements
amp3PostA   7db                24db     datasheet
padr3          -                 -3db   dana drawing
xbfilter     -                   -2db   dana drawing
padr4          -                 -5db   dana drawing
amp4PostA   7db                24db     dana drawing
padr5          -                 -2db   data drawing
xbdiplexor     -                 -1db   dana drawing
padR20         -                 -7db   dana drawing

Key:

• Cx  is a cable
• pad is a resistor
• Amp is an amplifier
• a - in the noise figure col says to use the loss as the noise figure (pads).
  
• The #'s come from dana's drawing.

•  210622 we moved the xbfilter to before the 1st amp in the post amp chassis so the amp would not see all the power from 4 to 8 ghz.

sband receiver chain levels

Documentation: (top)

• Software:

• p12mProg.. the AO 12meter control program.
• Setting up the controller at AO
• Datataking
• 12 meter datataking with tcl, looking at the data with idl.
  
• pre 2017 datatking with mock spectrometers
• Udc
• vlbi software: sched,vex2snap,snap,field system,rdbe
• acronyms
• dbe-Digital BackEnd
• ddc-Digital Down Conversion
• dbe mode (personality). 4 to 8 filters per subband with arbitrary freq offsets and bandwidths.
• pfb-Polyphase FilterBank mode
• dbe mode (personality). 16 bands of 32mhz each over the 512 Mhz band.
  
• rdbe- Roach Digital BackEnd
• digital backend using casper  roach board.
  
• vex-Vlbi EXperiment - describe a complete description on a vlbi experiment
• independent of any particular data acquisition or correlator.
• vdif-Vlbi Data Interface Specification
• defines format of recorded data.
  
• vsi -Vlbi Standard Interface specification.
• vsi-s  software interface
• vsi-h  hardware interface
  
• Files,programs order
  
• sched < xx.key > xx.vex
• vex2snap < xx.vex > xx.snp, xx.prc
• fieldsystem < xx.snp < xx.prc    > takes data
• > jive5ab (running on mark6 computer) -> disc
  
• >Or Cplane/Dplane running on mark6 computer) -> disc
  
• sched
  
• The SCHED User manual V11.6 may2020 (r.c. walker) (.pdf)
  
• rdbe
  
• Luis's :ao guide fo vlbis1+rdbe2&4 + mark6 (.pdf)   (local only)
• RDBE Setup and Operations (chet Ruszczyk 2015) (.pdf)
• RDBE command set v1.2(2012) (.pdf)
  
• mark5C recorder
• mark 5c command set (.pdf) (mark 5 Memo #091.1 2012)
• mark6 recorder
• haystack mark6 page
  
• mark 6 systems user's manual (nov2013) (.pdf)
• mark 6 command set (release 1.0) 2013 (.pdf)
• Getting started with your mark6 (v1.01 20nov13)  (.pdf)
  
• jiveab program documentation (.pdf)
• vbs_fs,vbs_ls,vbs_rm (.pdf)
  
• vdif
• vdif intro (2009) (.pdf) 
  
• vdif specification release 1.1.1 (.pdf)
• vdif extended data version 3 definition (.pdf)
• difx  utils
• vex: Vlbi EXperiment definition)
  
• vex file definition /example (rev 1.5b1 jan02) (.pdf)
• vex parameter tables (rev 1.5b1 29jan02) (.pdf)
  
• vsi: Vlbi Standard Interface
  
• vsi-s vlbi standard software interface specification VSI-S (rev 1.0, 13feb2003) allen whitney. (.pdf)
  
• Field System
  
• Introduction to the Field System for Non-Users (Ed Himwich 2000) (.pdf)
• field manuals (version 9.3 1997)
  

• Telescope:

• proposal (limited access) (.pdf)
  
• Operations and Maintenance manual (mechanical) rev:02mar10 .pdf
• Addendum A: rust prevention.
  
• DSN (JPL) optics design for telescope (.pdf)
• mechanical site acceptance test results (.pdf)
• AO if/lo
• dana's receiver chain diagram for complete system (.pdf)
• components/datasheets
• Reactel xb,sb filters and diplexor in postamp chassis (.pdf)
• sb
  
• zx60-242gln+ (.pdf)   postamp chassis . 1st amp after filter
• zx60-p2015ln+ (.pdf) postamp chassis. 2nd and 3rd amps after filter
• xb
• zx60-14012L-S+ (.pdf)  hub amp between xb  cables lna to pedestal.
  
• zx60-183+ (.pdf)   postamp chassis . both xb amps
• filter bank
• zva-213-s+ (.pdf) 26 db amp at input to filter bank box.
• zudc10-02183-S+ 10db coupler before foTx wb rcvr  (.pdf)
  
• zva-183gx-s+ (.pdf) wideband rcvr. amp before fo transmitter.
  
• Fiber optic transmiter:psi-2600-20l (.pdf)   (check that this  is  our model).
  
• Fiber optic receiver:psi-2600-20ur (.pdf)
  
• udc, insertion in
• to 305m if/lo
  
• Motion controller documentation
  
  
• The Feed from patriot
  
• S X feed Gain budget (15mar10) (.xls)
• 20100804 feed measurements (.pdf)
• miteq sband 148029 (.pdf)
• miteq xband 138968 (.pdf)
• rami_1-2wr113  loop coupler (.pdf)
• rami_1-2wr430 loop coupler (.pdf)
• rami_s-x feed update 02mar10 (.ppt)
• rami_Tas lna test results (.pdf)
• s-x feed Tas3 polycarb noise (.xls)
• s-x feed Tas3 teflon noise (.xls)
• sx lnas for 12m (.pdf)

• Miscellaneous notes/problems
• maintenance mode
• limit switches
• Background info:
• vlbi2010: current and future requirements for geodetic vlbi system (.pdf)
• design aspects of the vlbi2010 system (ivs report 2009) (.pdf)
  
• radio freq optics design of the 12-meter ant. for the array based deep space network (.pdf)

Daily temperature plots

    Daily plots are made of the temperature in the 12meter hub, 12meter motor control box, and the temperatures measured from the orion weather station (atop the lidar lab). The plots are generated at 1am each day via  a crontab  running on megs3. A postcript (.ps) and pdf (.pdf) file are generated for each day.

    Directory listing of daily temperature plots

processing: x101/12meter/temp/plottempdaily.sc

My notes

• xband wave guide wr112 (1.12 inches long dimension)
• te10 mode  cutoff freq: 5.263 GHz.:

History extended

210409 - fiber patch cords in pedestal replaced

    When opening and closing the cabinet (holding postamps,fiber tx) in the pedestal , saw large change in the levels in the ctrlroom (1/6 Tsys). We found the polB fiber connector at the patch  panel loose. When we tightened it, the output power in the ctrlroom went  way down. When loosening it, it went back to the original level.
    Osvaldo changed both of the fiber patch cables. After  this, opening and closing the cabinet made little change in the power levels seen at  the control room. We still much larger dropouts in polB relative to polA (although they both seem to happen together).  May be some kind out of band compression? More notes: x101/210409/chksys.txt

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