TGBT14A _912_100 Modes 4 9 testing Scan List Standard Setup. Boom is out, X band is not in focus, though scans will still be performed with X band. * Scans ...
VEGAS dimple The dimple When testing the new fix to the Tsys Variations, it was noted that in position switched data a dimple exists in the center of strong cont...
VEGAS balance problem Tiger Team Week Overview The current requantization balancing algorithm does not always succeed. An example is the configuration eso558_ve...
TGBT14A _912_96 98 Testing new BOF files for Modes 4 9, 10 19 Sessions 96 and 97 In Session 96, we tested the "Hardware Fix" for modes 10 19, which would allow...
Spectrometer Decommissioning Plan 1. make sure and document that we are finally happy with the performance of all aspects of VEGAS (e.g. baselines and long integ...
VEGAS Status Update last updated 21 April 2015 VEGAS Bank to Bank Variations Resolved This problem has been resolved. See this page for more details. Introduc...
VEGAS Spectrometer Bank to Bank Variations Resolved We believe we have definitively isolated the cause of the VEGAS bank to bank variations in system temperature ...
Astronomical Tests with VEGAS and Spectrometer Overview To test the 'fix' of running only a single channel through each of the dual channel VEGAS IF modules, we ...
TGBT14A_912_90 VEGAS bank to bank tests with Spectrometer, etc Goals 1. Configure the system as normal for VEGAS and the Spectrometer, and look at the respect...
Tiger Team Week 13 17 April 2015 Introduction The goal of the Tiger Team Week is to brainstorm possible causes for the VEGAS bank to bank variation problem, ...
TGBT14A_912_89 Troubleshoot latest VEGAS problems Goals * Troubleshoot latest egregious VEGAS problems, with a focus on switching signal distribution system ...
TGBT14A_912_87 VEGAS bank to bank discrepancy tests Goals * Get spectral line data with simultaneous DCR and/or Spectrometer Summary Starting with Scan 9 (wh...
Vegas Pulsar Software Plan This is the general plan for the development and test of the software side of the VPM project. (As discussed in the meeting on 2015 04 ...
TGBT14A_912_86 Analysis Noise source directly into VEGAS ADCs Seven channels of the splitter connected to VEGAS banks E2 through H2. Eighth channel connected to ...
VEGAS Bank Discrepancy Problem (page created 21 March 2015) For earlier discussions, and a description of the astronomical manifestation, see see VegasBankDiscre...
VEGAS Bank Discrepancy Problem 2015 March 21 For earlier discussions, see VegasBankDiscrepancyProblem2015Jan30, and subsequent links Expected VEGAS Astronomica...
TGBT14A_912_85 VEGAS tests with the DCR Goals * Configure VEGAS for cal switching; look at VEGAS IF module monitor with DCR * try Modes 1 and 4 with differ...
TGBT14A_912_84 VEGAS tests with the DCR Goals * Configure VEGAS for cal switching; look at VEGAS IF module monitor with DCR Details * Set up at 2pm. Need ...
Modifying the GBT Observing System to support dual pulsar backend operation. DRAFT This page describes the requirements for, and capabilities of the GBT observi...
TGBT14A_912_83 Bank to Bank problems with real hardware, real software Goals * Total power and spectrum ratios ADC / filtersnap / HPC spectra * Identical r...
TVEGAS_46 Bank to Bank problems with real hardware, software simulator Goals * Check KATCP snaps versus Archivist snaps Ray has already done this * Total...
TVEGAS_45 Bank to Bank tests with real hardware, simulated software Goals: See VegasBankDiscrepancyProblem * Manager / Archivist snapblocks / total power valu...
VEGAS Bank Discrepancy Problem 24 January 2015 More attempts to diagnose the cause of this problem, after the requantization balancing fix. Experimental setup ...
VEGAS Bank Discrepancy Problem 10 December 2014 Summary The same receiver/feed/polarization data acquired through different Banks of VEGAS show different line ...
VEGAS Bank Discrepancy Problem 13 January 2015 More attempts to diagnose the cause of this problem, after the requantization balancing fix. Experimental setup ...
VEGAS Bank Discrepancy Problem 21 January 2015 More attempts to diagnose the cause of this problem, after the requantization balancing fix. Experimental setup ...
VEGAS Bank Discrepancy Problem It has been observed that VEGAS measured Tsys values and line intensities can vary by ~ 10% between Banks, even when they are confi...
TGBT14A_912_79 Bank to bank variations with noise source Goals * test banks E through H with a new, flat bandpass, noise source. Details * set up the new ...
TGBT14A_912_76 Continued bank discrepancy tests NB: Pol 1 becomes unstable half way through this session NB: Scan 38 and onwards were all done with VEGAS switchin...
TGBT14A_912_78 Continued bank discrepancy problems Goals * Run Glenn's cal switching driven external to VEGAS test Details * Start at 11:00am * Edit ve...
Continued Tests of the Bank Discrepancy Test the stability of the analog system.TGBT14A_912_77 * Scans 1:10 TP scans of HI, moving the line across the VEGAS ...
TGBT14A_912_75 continued bank discrepancy tests Goals * Continue bank comparison tests Details * Ray switches to latest version of Manager * roaches E ...
VEGAS Pulsar Mode Simulator This page describes the VEGAS Pulsar Mode Simulator (VPMS), and describes how to run observations using it. The Hardware The VPMS is ...
Green Bank Spectrometer Project Number 450102 Description: Status Update and To Do List * VegasStatusUpdate * VegasToDoList Project Description * Ove...
TGBT14A_912_74 repeat 73 tests with Bank E and H Roaches swapped Details * Repeat Mode 4 tp_nocal tests from yesterday with Roaches E and H swapped in the rac...
TGBT14A_912_73 Continued Bank discrepancy tests Setup * Get Ray to copy in latest version of Manager for me, plus mode 4 = BOF 123, mode 5 = BOF 124. * Fix...
TGBT14A_912_71 Continued VEGAS bank discrepancy tests This was all done with the wrong (release) version of the Manager... This will have screwed up the Balancing...
TVEGAS_44 Continued tests with the simulator Setup * Using the new USB controlled attenuator; range 0 30dB attenuation * running procs from /users/rprest...
Detailed Notes for Tests of Low Priority VEGAS Pulsar Modes List all tests, their status, and notes for each mode. Note: not all of these modes may be implemented...
TGBT14A_912_69 continued bank discrepancy tests on real VEGAS Setup * Start 8:10am * run into Manager problems (loading old BOF). Finally get started aroun...
TGBT14A_912_58 Spike Tests with noise source Goals Gather data with which to determine the location of the VEGAS spurs, this time using the noise source so that ...
TGBT14A_912_49 Spike Tests Goals * Gather data with which to determine the location of the VEGAS spurs Details * Scan 1 : SpikeTestMode4EightBanks_AK (5 minu...
Development Strategy Overview The intent of this project is to deliver a well documented, easily maintainable instrument which has all the facilities and ancilla...
TVEGAS_43 Continued tests in simulator Setup * Using the new BOF with Randy's new approach to lbw_gain. * Jason installs a new amplifier and some pads. ...
Bank to Bank Discrepancy test with SRBS in the Tape Room Overview Test the effects of 'digital gain' and attenuator settings on the noise source input. These tes...
TGBT14A_912_67 Continued Bank Discrepancy Tests Experimental setup * Ray has fixed the filtersnap_nogain sampler. Run some quick astronomical tests * Archv...
TGBT14A_912_65 Continued Bank to Bank Discrepancy Investigations Experimental Setup Jeremy Darling tests * Start at 9:00am * Jason has hooked up the noise...
June 11, 2014 Testing Goal: * See if ghost line is in L1/LBW1 modes Info: * TGBT13B_502_66 Log: * Scan 1: ghost_line_test_mode4. including test tone...
AGBT14B_431 tests of Dana's scripts Goals * Test Dana's 3Helium scripts Details * start at 6:30pm. Antenna is in scan co ordinator but locked out. Start w...
VEGAS Commissioning Memo Data Reduction Notes Introduction This page is for shared work on the data reduction for the VEGAS commissioning memo. Eventually, the c...
TGBT14A_912_56 Comparing Noise Levels Between the Spectrometer and VEGAS Goals * Run Scans with KFPA using VEGAS and the spectrometer to compare the noise lev...
VEGAS First Integration Tsys Problem The problem Jay's student noticed that Tsys was periodically very high in their data and so they reported the problem. From ...
VEGAS Sawtooth Problem THIS PROBLEM WAS CAUSED BY A BAD BOF FILE FOR MODES 2 and 3 The problem When the problem is present, the total power spectrum appears to b...
TGBT14A_912_47 back to back VEGAS / Spectrometer tests Goals * Run Jim Braatz KFPA observing scripts with Spectrometer and VEGAS Details * Start at 12:20p...
2014 November 31 VEGAS testing Overview At L band, the baseline of the YY polarization was seen to be non flat by Adam last week. We will test whether placing s...
2014 October 23 VEGAS testing Overview Today we are hoping to test: * Updates to the blanking times * Updates to integration time rounding * Updates to ...
2014 October 31 VEGAS testing Overview At L band, the baseline of the YY polarization was seen to be non flat by Adam last week. We will test whether placing so...
VEGAS Baseline Tests for wide bandwidth Modes 1,2,3 2014 09 15: D. T. Frayer On 2014 September 04, we took some comparison baseline data using Q band with VEGAS m...
GBT14A _912_32 Goals * ADC tests for CASPER Group Background In a previous test, we tested looking for spikes in Q band while connected to a noise source and...
September 19, 2014 Spike tests with OGP Calibration Overview The Offset Gain and Phase (OGP) calibration of the four ADCs interleaved to create the VEGAS output ...
SubBeamNod Observations with VEGAS Project 14A565 is the first science project using SubBeamNod observations. It requires deep observations with flat baselines to...
TGBT14A_912_60 Testing Bank to Bank discrepancies Goals * Requantization balancing should be working now, but keep an eye on this. * Run Mode 3 / L band an...
TGBT14A_912_62 Testing Bank to Bank variations with noise source 17 and 21 January 2015 17 January 2015 * We cannot use Astrid, so simply use VEGAS and the ...
TGBT14A_912_63 remove attenuation from CM1 * Galen removes a 6dB pad from CM end of CM1. * run eso558_vegas * Now balances ok, but with attenuators: ...
TGBT14A_912_64 continue bank discrepancy problems * Start at 11:00am * Write a procedure Archivist to configure the archivist correctly. * Need to set up...
June 5, 2014 Testing Goal: * Test fixes for ripple tests in manager. start with mode 1. Test 2 3 as well. Might also be worth testing wider bandwidth mode ...
May 22, 2014 Testing Plan: * Try Glenn's suggested fix on the system for frequency image problem * Run a couple of different modes to make sure missing cha...
Testing on May 29, 2014 Plan: * Try out new bof file for modes 10 19 and see if the image is gone * Double check that mode 20 29 are okay if mode 10 19 are...
2014 November 7 VEGAS testing Overview Testing the new OGP calibration method to compare against the current (production) method Method Same method as in the pr...
TGBT13B_502_48 Testing AutoPeak and data blanking Goals * Test that AutoPeak, etc, will run even if dopplertrackfreq is set, and is outside DCR range. * Te...