APRPP review committee 24oct13 Telescope status 2013 APRPP review committee Phil Perillat.

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Presentation transcript:

APRPP review committee 24oct13 Telescope status 2013 APRPP review committee Phil Perillat

APRPP review committee 24oct13 Talk Outline Timeline of some events during 2013 Performance: Gain,Tsys,SEFD, surface error. Pointing error. Issues. RFI: Misc: Online:  oct13_aprpp

APRPP review committee 24oct13 Timeline of some events DateEvent 01apr13Remy carsr radar up. (1269,1274),(1327,1332) 12jul13Dome drag link comes loose. 25jul13Testing ao19 on telescope 01aug13Sbn 1 st stage amps fried by xmter (shutter bypassed) 05aug13430 dome turnstile junction damaged. Replaced with old one. 08aug13Faa carsr radar up (1252,1257),(1344,1349) 17sep13430 dome polA cavity filter repaired.

APRPP review committee 24oct13 Gain and pointing error vs az,za Data from calibration runs jan13 to oct13 Use selected frequencies: lbw,sbn,cb,cbhi,xband Gain, pointing errors vs za. Gain falloff za > 15 is spillover Gain, pointing errors vs az Az shows gain drop off for high frequencies. Could be: Td 4 losing tension Platform tilt (but don’t see 180 deg symmetry). Dish motion caused by southeast fill area.

APRPP review committee 24oct13 Gain,Tsys, SEFD vs freq Limit za 5-15 deg (spillover,collimation) Spread in value from az,za variation Gain,Tsys depend on accurate cal values SEFD (Tsys/Gain) only depends on srcFlux. 430 had tsys problems from cavity filter. SEFD variation cbh,xb coming from gain, not Tsys. Use gain vs freq to measure surface errror.

APRPP review committee 24oct13 Gain vs Freq:ruze curves

APRPP review committee 24oct13 Pointing error Arrow plot of pointing errors Length of error is pnt error (1tick=10asecs) Direction of arrow is error direction Color is frequency/receiver Rms pointing error by freq/receiver Dips are freq with few measurements Gain loss from pointing error assumes gaussian Remember:Rms error is only 68% of the time

APRPP review committee 24oct13 Issues: performance Distomats need to be replaced. Current distomats no longer available and they are starting to fail. Possible replacements make rfi. We need to start surveying the optics again. Horns, tertiary, secondary, dome position. Would be great if we could continually monitor the position of the dome with an automated theodolite (could replace distomats) We also need to learn to use or rewrite lynn bakers old programs to analyze the data. Dome is still over weight.

APRPP review committee 24oct13 RFI: CARSR radars CARSR (Common Air Route Surveillance Radar) are replacing the FAA and Punta Borinquen radars. Rfi from hilltop monitor spectrum 22oct13 00:00 thru 10:00 shows: Unblanked FAA Radar Blanked punta borinquen radar The FAA radar is probably weaker than the punta borinquen radar because it is shielded by some hills and it is twice the distance. Faa radar should start blanking soon… RadarFreqBandwdDuty cycle Sector BlankingDist nmi Old FAA1330, Mhz.5%no57 CARSR FAA , , Mhz chirped 9%Yes (but not yet) +/-2 deg 57 Old Punta Borinquen 1270 or Mhz.5%no24 CARSR PuntaBor , , Mhz Chirped 9%Yes (01oct13) +/- 2 deg 24

APRPP review committee 24oct13 Dome drag link comes loose On 12jul13 one of the 4 drag links on the dome came loose. The drag links connect the motors to the dome The drag links only pull,push the dome. They do not support the dome’s weight. The small cotter pin probably snapped (from play in the drag link). Eventually the pin came loose on one side and bent the connection plate. Fix: New plates and drag links were constructed. The cotter pin was replaced with something that won’t break.

APRPP review committee 24oct13 Any questions?