VLBA Data Acquisition Memos

Memo Submission

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Memo Number Title Author(s) Date Original PDF
1 Memo Series A. E. E. Rogers 11/30/83
2 Proposed Video Convertor Block Diagram A. E. E. Rogers 11/28/83
3 Preliminary Evaluation of Low Noise Voltage Tuned Osoillators A. E. E. Rogers 11/28/83
4 Minutes of Telecon Held 13 Dec 83 at 1430 UT 01/27/84
5 Minutes of VLBA Recorder/Acquisition Group Help 25 Jan 84 at 1400 EDT A. E. E. Rogers 02/84
6 Minutes of VLBA Recorder/Acquisition Group Held 22 Feb 84 at 1400 EDT 02/27/84
7 Fringe Rotation and Variable Phase Sampling A. E. E. Rogers, J. C. Webber 02/23/84
8 Rejection of Receiver Images for Various VLBI Processing Techniques A. E. E. Rogers 01/03/84
9 Single Sideband Fringe Rotation - The Effect of the Second Quantization on the Bandpass Filter Function A. E. E. Rogers 02/29/84
10 Minutes of VLBA Data Acquisition Held 28 March 1984 at 1300 EST 04/02/84
11 Glossary of Recording Jargon L. R. D'Addario 02/20/84
12 Data Transmission Error Specification L. R. D'Addario 02/26/84
13 Sony High-Density Digital Recorder A. E. E. Rogers 04/18/84
14 Closure Errors from Bandpass Offsets A. E. E. Rogers 04/25/84
15 Minutes of Acquisition/Recorder Telecon Held 25 April 1984 at 1300 EST 04/26/84
16 Visit To Kodak Datatape A. E. E. Rogers, R. J. Capallo 05/07/84
17 Minutes of VLBA Recorder Acquisition Group Telecon Held on 23 May 1984 at 1400 EDT 05/25/84
18 Minutes of VLBA Recorder Acquisition Group Telecon Held on 23 May 1984 at 1400 EDT A. E. E. Rogers 07/02/84
19 Suggested DPS/Correlator Interface A. R. Whitney, A. E. E. Rogers, J. C. Webber 07/28/84
20 Update on Suggested DPS/Correlator Interface Haystack Group 08/24/84
21 Automatic Video Cassette Changer W. T. Petrachenko 09/10/84
22 Minutes of VLBA Recorder Group Held 12 September 1984 at 1600 EDT 09/13/84
23 Is Phase Switching Needed? A. E. E. Rogers 09/17/84
24 Playback To Correlator Interface: Early Ideas L. R. D'Addario 09/18/84
25 Improving the Dynamic Range of the I.F. To Video Converters A. E. E. Rogers 10/02/84
26 Error Correction for VLBI S. Wilson 10/05/84
27 Tape Synchronization at VLBA Correlator A. R. Whitney 10/29/84
28 Proposed Recorder Specifications - Revised 11 September 1984 A. E. E. Rogers, J. C. Webber, H. F. Hinteregger 09/11/84
29 Comments on "Tape Synchronization", Acq Memo #27 L. R. D'Addario 11/13/84
30 Diminishing Returns H. F. Hinteregger 11/29/84
31 Minutes of VLBA Data Acquisition/Recorder Group Telecon Held on 12 December 1984 at 1600 EST 12/13/84
32 Minutes of VLBA Recorder/Acquisition Group Telecon Held 9 January 1985 at 1600 EST 01/10/85
33 Is Efficient Encoding of 3-Level Data Worth the Extra Cost and Complexity? A. E. E. Rogers, J. C Webber 01/16/85
34 Upper Limit on the "DC" Correlation Present in the Mark III A. E. E. Rogers 02/04/85
35 Reasons for Not Separating the Formatter from the IF To Baseband Conversion Electronics A. E. E. Rogers 02/20/85
36 Minutes of VLBA Acquisition/Recorder Group Meeting Held 13 March 1985 at 1600 EST A. E. E. Rogers 03/14/85
37 Some Suggestions on RF-Pulse Phase and Delay Calibration A. E. E. Rogers 04/03/85
38 Minutes of VLBA Recorder/Acquisition Group Telecon Held 10 April 1985 at 1600 EST A. E. E. Rogers 04/16/85
39 The DPS / Correlator Control Interface J. D. Romney 04/85
40 Preliminary VLBA Format Proposal #1 W. T. Petrachenko 04/85
41 Across Track Parity W. T. Petrachenko 05/85
42 VLBA Data Acquisition and Playback Systems Design and Cost Estimate 05/85
43 Minutes of VLBA Recorder/Acquisition Group Telecon Held 8 May 1985 at 1600 EDT A. E. E. Rogers 05/10/85
44 Minutes of VLBA Data Acquisition Group Telecon Held 19 June 1985 at 1600 EDT A. E. E. Rogers 06/21/85
45 Minutes of the VLBA Data Acquisition Group Telecon Held 17 July 1985 at 1600EDT A. E. E. Rogers 07/29/85
46 IF Processing Electronics - Preliminary Design A. E. E. Rogers 07/31/85
47 Active Low Pass Filter for Baseband Converters A. E. E. Rogers 08/05/85
48 Suggested VLBA Bandpass A. E. E. Rogers 08/07/85
49 Minutes of Data Acquisition/Recorder Group Telecon Held 14 August 1985 at 1600 EDT A. E. E. Rogers 08/16/85
50 VLBA Bandpass and Closure Phase Errors A. E. E. Rogers 08/21/85
51 Extending the Baseband Bandwidth of the Baseband Converter To 16 MHz A. E. E. Rogers 09/03/85
52 Cost of Increased Data Rates in Acquisition and Playback A. E. E. Rogers 09/04/85
53 Suggested Interfaces To the Data Acquisition System (DAS) A. E. E. Rogers 09/17/85
54 Minutes of Data Acquisition and Playback Group Telecon Held at 1600 EDT, 18 September 1985 A. E. E. Rogers 09/19/85
55 Proposed Use of Miniature Coaxicon Contacts A. E. E. Rogers 10/07/85
56 Minutes of VLBA Data Acquistion/Recorder Group Telecon Held 23 October 1985 at 1300 EDT A. E. E. Rogers 11/85
57 Minutes of Recorder/Acquisition Group Telecon Held 13 Noventoer 1985 at 1600 EST A. E. E. Rogers 11/18/85
58 Susceptibility of VLBA Data Acquisition System To Interference in the I.F. (500-1000 MHz) Band A. E. E. Rogers 11/18/85
59 Minutes of the Acquisition/Recorder Group Telecon Held 11 December 1985 at 1600 EST A. E. E. Rogers 12/13/85
60 Minutes of the Recorder/Data Acquisition Telecon Held 22 January 1986 at 1300 EST A. E. E. Rogers 01/23/86
61 Preliminary Tests of Prototype VLBA Baseband Converter A. E. E. Rogers 03/04/86
62 Minutes of VIBA Data Acquisition/Recorder Group Meeting Held 19 March 1986 at 1300 EST A. E. E. Rogers 03/20/86
63 Proposed Use of Coaxicon Connectors in VLBA Modules A. E. E. Rogers, R. J. Cady 03/28/86
64 VLBA Baseband Converter Tests- Status of Performance Verification A. E. E. Rogers 04/29/86
65 MCB Protocol for Baseband Converter and I.F. Distributor A. E. E. Rogers 05/07/86
66 Minutes of the VLBA Recorder/Data Acquisition Telecon Held 9 July 1986 at 1300 EDT A. E. E. Rogers 07/10/86
67 Stability Test of VLBA Data Acquisition Electronics A. E. E. Rogers, K. Ball 07/16/86
68 Minutes of the VLBA Data Acquisition and Playback Group Telecon Held 10 September 1986 at 1300 EST A. E. E. Rogers 09/11/86
69 Active Filter — Sensitivity To Operational Amplifier Performance A. E. E. Rogers 09/19/86
70 Baseband Converter Local Oscillator Phase Noise Tests with Various Transistor Types A. E. E. Rogers 09/29/86
71 VLBA Acquisition Recorder Controller Communications Protocol R. Cappallo 10/16/86
72 Baseband Converter MCB Protocol Errata A. E. E. Rogers 11/05/86
73 Minutes of VLBA Data Acquisition/Recording Telecon Held 1300 EDT on 5 November 1986 A. E. E. Rogers 11/07/86
74 Improved 16 MHz Bandpass and Further Tests of the Bandpass Stability A. E. E. Rogers 11/13/86
75 VLBA Baseband Converter Tests - Status of Performance Verification II A. E. E. Rogers 11/13/86
76 Radio Shack TRS-80 Model 100 Portable Conputer for Check-out of VLBA Hardware Requiring MCB Communications A. E. E. Rogers 01/15/87
77 Checks and Diagnostics of I.F. Processing Electronics A. E. E. Rogers 01/26/87
78 Revisions To Signal Levels in VLBA Receiving System A. E. E. Rogers, D. Bagri 01/26/87
79 4-Level Sampling and Baseband Conversion AGC A. E. E. Rogers 01/26/87
80 I.F. Distributor and Baseband Convert Evaluation and Modifications A. E. E. Rogers 02/09/87
81 Tape for the VLBA J. C. Webber, H. F. Hinteregger 02/25/87
82 Changes To MCB Protocol for Baseband Converter and I.F. Distributor A. E. E. Rogers 03/13/87
83 Minutes ot the Data Acquisition/Recording Group Telecon Held 11 March 1987 at 1300 EST A. E. E. Rogers 03/13/87
84 Digital Gain Control - Improved Phase Performance A. E. E. Rogers 03/11/87
85 Tests of Switched Power or "Synchronous” Detectors in the I.F. Distributors and Baseband Converters A. E. E. Rogers 04/03/87
86 Adjustments Which May Be Required in the Checkout of the VLBA Baseband Converters A. E. E. Rogers 04/30/87
87 Minutes of VLBA Recorder Group Telecon Held 6 May 1987 at 1300 EDT A. E. E. Rogers 05/07/87
88 The Effect of Bias Current Fluctuations on the Phase Noise of a FET Oscillator A. E. E. Rogers 06/11/87
89 Proposed New Rack Layout for DAR A. E. E. Rogers 07/09/87
90 Minutes of VLBA Data Recording Telecon Held 1300 EDT on 8 July 1987 A. E. E. Rogers 07/09/87
91 Proposed VLBA Format A. E. E. Rogers 08/87
92 Sony Visit / D1 Tape for VLBA / MP Tape, MIG Heads? H. F. Hinteregger 04/10/87
93 Minutes of the VLBA Recorder/Data Acquisiton Telecon Held 9 September 1987 at 1300 EDT A. E. E. Rogers 09/10/87
94 Tape Packaging H. F. Hinteregger 09/14/87
95 REC #1 Acceptance Tests J. C. Webber 10/26/87
96 Minutes of the VLBA Recorder/Data Acquisiton Telecon Held 4 November 1987 at 1300 EST A. E. E. Rogers 11/09/87
97 MKIIIA - VLBA Compatibility Mode A. E. E. Rogers, J. C. Webber 11/09/87
98 Operating the VLBA Recorder J. C. Webber 11/12/87
99 VLBA Tape Drive Control J. C. Webber 11/12/87
100 Dense Prognostications H. F. Hinteregger 11/25/87
101 VLBA Baseband Converter Bandpass A. E. E. Rogers 12/23/87
102 Data Acquisition Modes A. E. E. Rogers, J. C. Webber 12/30/87
103 Minutes of the Data Acquisition/Recorder Telecon Held 13 Jan 88 A. E. E. Rogers 01/14/88
104 Data Acquisition Modes - Revision of Memo #102 A. E. E. Rogers, J. C. Webber 01/14/88
105 Approximate Cost Comparison for 1 vs 2 DAR Racks/Site A. E. E. Rogers 01/19/88
106 Minutes of the Data Acquisition/Recorder Group Telecon Held 9 March 1988 at 1300 EST A. E. E. Rogers 03/10/88
107 Learning from Errors H. F. Hinteregger 01/21/88
108 Phase Calibration Detection and Processing at the Sites A. E. E. Rogers, E. F. Nesman 03/05/88
109 Minutes of VLBA Recorder Group Telecon Held 11 May 1988 A. E. E. Rogers 05/12/88
110 Tape Track Formats J. C. Webber 05/27/88
111 New Bandwidth Compensation Gain Codes for Baseband Converters A. E. E. Rogers 07/05/88
112 Minutes of VLBA Recorder/Data Acquisition Group Telecon Held 13 July 1988 at 1300 EDT A. E. E. Rogers 07/14/88
113 Minutes of VLBA Recorder Group Telecon Held 14 September 1988 at 1300 EDT A. E. E. Rogers 09/15/88
114 Requirements To Make VLBA DAR and REC Fully Compatible With Geodetic S/X Mode A. E. E. Rogers 10/14/88
115 Minutes of VLBA Acquisition/Recorder Group Telecon Held 9 November 1988 at 1300 EDT A. E. E. Rogers 11/11/88
116 Coaxicon Connector Alignment A. E. E. Rogers 11/22/88
117 MKIIIA/VLBA Compatibility-An Update A. E. E. Rogers 11/29/88
118 Recording Characterization Test Plan A. E. E. Rogers 12/09/88
119 Narrow Guardband Test of VLBA Tape Recorder G. Peck 12/20/88
120 Computers, Software, and Procedures for Check-Out of DAR Modules A. E. E. Rogers 01/19/89
121 Tracking Offset Sensitivity To Capstan Axis Alignment A. E. E. Rogers 02/24/89
122 Tracking Offset Sensitivity To Capstan Taper Angle A. E. E. Rogers 02/24/89
123 First Order Model for Recorder Tracking A. E. E. Rogers 02/24/89
124 Theory of Vacuum Loop and Tape Path A. E. E. Rogers 02/24/89
125 Minutes of Recorder Group Telecon Held 9 February 1989 at 1300 EST A. E. E. Rogers 02/09/89
126 Variation of the Tracking Sensitivity with the Angle the Tape Makes with the Precision Plate A. E. E. Rogers 02/24/89
127 Modification of Mark 3A Systems To Increase Compatibility With VLBA A. R. Thompson 01/31/89
128 Pulse Calibration Detection in VLBA A. R. Thompson 02/08/89
129 Model for the Tracking Offset Dependence on Tape Defects A. E. E. Rogers G. Peck 04/13/89
130 Visit To Honeywell Corporation A. E. E. Rogers 03/08/89
131 Friction at the Tape Entry and Exit Points A. E. E. Rogers 03/13/89
132 Various Operating Modes of the Model 96 and Their Sensitivity To Machine Alignment and Tape Defects A. E. E. Rogers 03/13/89
133 Measurement of the Thermal and Elastic Constants of Magnetic Tape A. E. E. Rogers 03/30/89
134 Tape Reel Pack - Computer Simulations A. E. E. Rogers 04/03/89
135 Tape Slitting Signatures and Head-to-Tape Tension Noise from Slitting Errors A. E. E. Rogers 04/05/89
136 Tracking Offset Sensitivity To Idler Tilt and Taper Angle A. E. E. Rogers 04/10/89
137 Draft Recommendations for Improvement To Model 96 Mechanical Performance A. E. E. Rogers 04/12/89
138 Idler Bearing Friction A. E. E. Rogers 04/12/89
139 Minutes of VLBA Data Recording Telecon Held 12 April 1989 at 1300 EDT A. E. E. Rogers 04/13/89
140 Some Order of Magnitude Calculations of the Air Entrapment at the Idler A. E. E. Rogers 04/18/89
141 Head To Tape Contact Profiles: Computation of Inter-Changeability of Various Tapes A. E. E. Rogers 04/18/89
142 Tape Strain: Determination of the Best Tape Tension for Thin Tape A. E. E. Rogers 04/24/89
143 Summary of What We Have Learned During Recorder Mechanical Study A. E. E. Rogers 05/01/89
144 Some Tests of the Effect of Idler Groove Cross Section A. E. E. Rogers 05/01/89
145 Improved Performance with AT&T Bit Synchronizer D. Smythe, E. Nesman, R. Cappallo 05/04/89
146 Head To Tape Contact at 270 IPS A. E. E. Rogers 05/05/89
147 Measured Head Profiles A. E. E. Rogers 05/16/89
148 Some Added Notes To the BBC 0.5-1.0 GHz Oscillator A. E. E. Rogers 05/16/89
149 Model for Recorder Tracking Response To Tape Slitting Signatures A. E. E. Rogers 05/18/89
150 Draft Specifications for VLBA Tape and a Very Brief Look at Some Newer Tapes A. E. E. Rogers 05/23/89
151 Recorder "Pretest" - Methods for Checking Recorder Performance A. E. E. Rogers, R, J. Cappallo, H. F. Hinteregger, D. L. Smythe, A. R. Whitney 06/20/89
152 Magnetic Circuit Model for VLBA Headstack A. E. E. Rogers 06/05/89
153 Recommendations for DAR Protection Measures A. E. E. Rogers 03/31/89
154 MKIIIA/VLBA Narrow Track Headstack Commercial Specifications J. F. Connolly, H. F. Hinteregger, D. L. Smythe 04/09/91
155 Measurement of Mutual Inductance of VLBA Headstack A. E. E. Rogers 07/06/89
156 Tests of New Large Diameter Idler Roller A. E. E. Rogers 07/10/89
157 Tests of D1 and D2 Tapes B. Lai, A. E. E. Rogers 07/20/89
158 Playback of Pie Town data at the MKIII Correlator - Corrected Version A. E. E. Rogers 08/22/89
159 Minutes of the VLBA Recorder Telecon Held 9 August 1989 at 1300 EDT A. E. E. Rogers 08/10/89
160 Do We Need a Prepass? G. Peck 08/14/89
161 Summary of VLBA Recorder Review Meeting A. E. E. Rogers, K. Stetten 08/17/89
162 Improvements in SSB Mixer Submodule of BBC A. E. E. Rogers 08/24/89
163 Plan for More Complete Testing of 13µm D-1 Tape A. E. E. Rogers 08/28/89
164 Dynamic Range of IFD Square Law Detector Bias Subtraction A. E. E. Rogers 08/30/89
165 Some Miscellaneous Problems Noted in the BBC Modules A. E. E. Rogers 08/30/89
166 Minutes of Ad Hoc Meeting Concerning Thin Tape for VLBA G. Peck 08/24/89
167 IF and Sampler Connections in the 14-Baseband-Converter DAR Configuration A. R. Thompson 08/22/89
168 More Computer Simulations on Head Wear and Transition from Thick To Thin Tape A. E. E. Rogers 09/10/89
169 Optimization of Equalizer for Playback of D1 Tapes at 56 Kb/in A. E. E. Rogers 09/14/89
170 Measurements of Head Wear Rates - Preliminary Results A. E. E. Rogers 09/19/89
171 Power Margin Tests of REC 3 A. E. E. Rogers, R. J. Cappallo 09/27/89
172 Some Quick Tests of S-VHS Tape A. E. E. Rogers 10/02/89
173 Minutes of Recorder Telecon Held 11 October 1989 at 1300 EDT A. E. E. Rogers 10/13/89
174 Suggestions for BBC Production A. E. E. Rogers 10/16/89
175 Performance of 3M5358 Relative To Sony D1K A. E. E. Rogers 10/17/89
176 Bandpass Simulations for BBC A. E. E. Rogers 10/23/89
177 Notes on Meeting on Baseband Converters A. R. Thompson 10/18/89
178 Circuit Board Changes in DAR J. C. Webber, R. R. Grenwis 10/23/89
179 Head To Tape Contact Pressure A. E. E. Rogers 11/02/89
180 Simple Optical Interferometer for Viewing Tape Surface Roughness A. E. E. Rogers 11/02/89
181 Method of Measuring Differential Tension in the Tape Path A. E. E. Rogers 11/20/89
182 Dual Sampler for Mark III Mode A Compatibility J. C. Webber 12/14/89
183 Test Fixture for Matching Mixers in the SSB Submodule of the BBC A. E. E. Rogers 12/21/89
184 Wavelength Dependence of D1 and MET - VLBA "Headcurves" A. E. E. Rogers 12/27/89
185 Tests of Emitter Follower Head Pre-Amplifier A. E. E. Rogers 12/27/89
186 Tests of a New Pre-Amp Configuration A. E. E. Rogers 12/29/89
187 Tape Noise Measurements of D1K and S-VHS A. E. E. Rogers 01/09/90
188 Channel Assignments for the Various DAR Configurations G. Peck 01/09/90
189 NRAO Thin Tape Procurement G. Peck 01/17/90
190 A Quick Test of 8 mm Evaporated Metal Tape (MET) A. E. E. Rogers 01/30/90
191 "In-circuit" Component Measurements for BBCs A. E. E. Rogers 01/31/90
192 Playback Transport Configuration A. E. E. Rogers 02/01/90
193 Identification Codes for 14-BBC DAR A. R. Thompson 01/26/90
194 Summary of What We Learned in Testing Tape Performance A. E. E. Rogers 02/02/90
195 Tests of Parallel Playback Electronics A. E. E. Rogers 02/02/90
196 Demonstration of Gigabit per Second Recording with the VLBA Recorder A. E. E. Rogers 02/07/90
197 Minutes of VLBA Telecon Held 14 February 1990 A. E. E. Rogers 02/15/90
198 Matched Mixer Pairs for SSB Mixers J. C. Weber, D. L. Thacker 02/07/90
199 Checkout of Baseband Converters A. E. E. Rogers 02/26/90
200 Parameterized Spacing Loss Curves for Transition from Thick To Thin Tape A. E. E. Rogers 03/12/90
201 Simple Test Set-up for BBC LO Phase Noise Tests A. E. E. Rogers 03/28/90
202 Proposed Plan for the Integration of Thin Tapes into the MKIIIA and VLBA Operations A. E. E. Rogers 04/26/90
203 Instructions for Using Baseband Converter Test Program E. Schlecht 04/30/90
204 Minutes of Recorder Meeting Held 2 May 1990 at 1300 EDT A. E. E. Rogers 05/03/90
205 Proposal for a Cost-Effective Doubling of Existing VLBI Sensitivity Haystack Observatory VLBI Group 05/18/90
206 Minutes of VLBA Recorder Telecon Held 13 June 1990 at 1300 EDT A. E. E. Rogers 06/14/90
207 Measurements of Record Spacing Loss and a Simple Numerical Model To Evaluate the Effect of Demagnetization Fields A. E. E. Rogers, S. Deligeorges 06/27/90
208 Tests of a Method To Support Thick and Thin Tape on a Processor Transport A. E. E. Rogers 06/27/90
209 BBC LO Phase Stabilization Time D. Bagri, A. E. E. Rogers 07/09/90
210 Tests of VLBA Read/Write Interface A. E. E. Rogers, H. F. Hinteregger 07/16/90
211 Record Cross-talk Theory A. E. E. Rogers, D. L. Smythe 07/17/90
212 Minutes of VLBA Recorder Telecon Held 8 August 1990 at 1300 EDT A. E. E. Rogers 08/09/90
213 Performance Specifications of the Baseband Converter Module A. R. Thompson 08/10/90
214 Some Tests of the TI TL592B Amplifier A. E. E. Rogers 08/13/90
215 Use of Unequal Wire Sizes To Match Mixers in BBC A. E. E. Rogers 08/21/90
216 Alternate IC for L.O. Unlock Indicator in BBC A. E. E. Rogers 08/22/90
217 Proposal for Design Change To Reduce L.O. Leakage from BBC A. E. E. Rogers 08/23/90
218 The Effect of DC Offsets on the Complex Correlation Amplitudes A. E. E. Rogers 08/23/90
219 Spurious Signals in the BBC A. E. E. Rogers 08/31/90
220 Dummy Headstack Post for Improved Tracking Symmetry A. E. E. Rogers, H. F. Hinteregger, P. Bolis 09/06/90
221 Replacement for MA-46577B Varactor in BBC Oscillator A. E. E. Rogers 09/10/90
222 Changes Needed in BBC Using Analog Devices 5539 A. E. E. Rogers 10/16/90
223 Spurious Signal Levels in DAR and Proposed Changes A. E. E. Rogers 09/27/90
224 "Self" Tests of DAR and REC A. E. E. Rogers 10/02/90
225 Preliminary Report on First VLBA Tape A. E. E. Rogers, H. F. Hinteregger, D. L. Smythe, P. Bolis 10/04/90
226 Thin Tape Facts H. Hinteregger 10/19/90
227 Alternative Mixers for Better Sideband Rejection in the BBC A. E. E. Rogers 10/25/90
228 Tape Winding and Tape Thickness Non-uniformity A. E. E. Rogers 11/30/90
229 Update on the AMPEX/Maxell Tape Packing Problem A. E. E. Rogers 12/04/90
230 Reduced L.O. Leakage from the BBC A. E. E. Rogers 12/12/90
231 Minutes of the VLBA Recorder Telecon Held 12 December 1990 at 1300 EST A. E. E. Rogers 12/13/90
232 Edge Slitting Signatures and Edge Quality of 16 µm Tapes A. E. E. Rogers, H. F. Hinteregger 12/31/90
233 Dynamic Forces on the Tape Edge A. E. E. Rogers 12/31/90
234 Measurement of D.C. Offsets from Sampler A. E. E. Rogers 01/07/91
235 Limitations of the Track Selector Switch in the VLBA Formatter A. E. E. Rogers, J. I. Levine 01/07/91
236 Tape Elastic Constant Check via Tape Winding A. E. E. Rogers, H. F. Hinteregger, P. Hinteregger 01/19/91
237 Methods of Measuring the Headstack Gap Length A. E. E. Rogers, H. F. Hinteregger 01/18/91
238 Recorder Controller Commands (ReCon v. 6.0) R. Cappallo 05/22/92
239 Version 5 of RECON R. Cappallo 01/25/91
240 Meeting on Problems of Analog Crosspoint Switch on A/D Board of Formatter D. Thompson 01/24/91
241 Revised Model for VLBA Head Efficiency A. E. E. Rogers 01/31/91
242 Penny & Giles VLBI Recorder Project Design Review - Trip Report D. Smythe 01/31/91
243 Capacitance of Gapped Bars D. Smythe 02/14/91
244 Minutes of Recorder Group Meeting Telecon Held 13 February 1991 at 1300 EDT A. E. E. Rogers 02/14/91
245 Efficiency Variations in VLBA Headstacks A. E. E. Rogers 02/25/91
246 Scanning Electron Microscope (SEM) Gap Length Measurement H. F. Hinteregger 02/27/91
247 Mark III Tape-Labelling and Handling Procedures A. R. Whitney, Haystack 03/20/91
248 Proposed Phase Cal Extractor for Upgraded Formatter A/D Board A. E. E. Rogers 03/28/91
249 Proposed Redesign of Formatter A/D Buffer Module A. E. E. Rogers, E. F. Nesman 04/01/91
250 VLBA Tape Recorder and Formatter Status/Error Monitor Points G. Peck 03/27/91
251 Minutes of VLBA Data Acquisition/Recording Telecon Held 17 April 1991 at 1300 EDT A. E. E. Rogers 04/18/91
252 How Head SNR Affects Reproduce Performance D. Smythe 05/17/91
253 12 Hours/Tape at 128 Mb/s A. E. E. Rogers 05/21/91
254 Calculations Concerning Air Entrapment at the Headstack and the Maintenance of Good Head-to-tape Contact A. E. E. Rogers 06/12/91
255 Specifications for VLBA Phase Calibration Pulse Generator A. E. E. Rogers 05/25/91
256 Tape Profile Along the Headstack A. E. E. Rogers 06/10/91
257 Dynamic Friction and Viscous Drag in the Vacuum Columns A. E. E. Rogers 06/17/91
258 Write Drier Asymmetry Improvements V. A. Tran, A. E. E. Rogers 07/11/91
259 Head To Tape Contact at 320 IPS with Thin Tape D. Smythe 06/17/91
260 Performance of Mark IIIA Recorder at 56 kbpi and 18 Mb/s Smythe 06/91
261 Minutes of Recorder Telecon Held 19 June 1991 at 1300 EST A. E. E. Rogers 06/20/91
262 Vacuum Column Air Bearing Clearance A. E. E. Rogers 06/27/91
263 Tape Winding Dynamics A. E. E. Rogers 07/08/91
264 Theoretical Model for Head Flying A. E. E. Rogers 07/26/91
265 Simple Method of Measuring the Edge Curl A. E. E. Rogers 07/10/91
266 Thermal Calculations for High Tape Speeds A. E. E. Rogers 07/15/91
267 Tape (Thin) and Transport Handling Proc A. E. E. Rogers 09/27/91
268 Slipping Capstans A. E. E. Rogers 07/15/91
269 Accelerated Tape Wear Tests A. E. E. Rogers 07/17/91
270 VLBA Write Driver at 18 Mb/s D. Smythe 07/12/91
271 Method of Contouring Heads for High Tape Speeds A. E. E. Rogers 07/31/91
272 Spacing Loss from Uneven Wear of Headstacks A. E. E. Rogers, H. F. Hinteregger 08/02/91
273 Magnetic Tape "Flying" Measurements vs. Model J. Starr, A. E. E. Rogers 08/23/91
274 Preliminary Tests of Various Low Friction Surfaces A. E. E. Rogers 08/08/91
275 Minutes of Recorder Telecon Held 7 August 1991 at 1300 EST A. E. E. Rogers 08/08/91
276 Quality Control Checks for Inch-Worm Drives D. Smythe 08/21/91
277 Modifying the VLBA Head Interface for Recording at 18 Mb/s D. Smythe 08/22/91
278 Missing Ground In Read Module K.M. Wilson 08/12/91
279 Reel Alignment Tolerance A. E. E. Rogers 10/21/91
280 Reels for Thin Tape H. F. Hinteregger 10/23/91
281 Possible Variations on Vacuum Loop A. E. E. Rogers 08/30/91
282 Additions To Head Flying Model and Comparison with Measurements A. E. E. Rogers 09/17/91
283 Preliminary Tests of New and Experimental Headstacks A. E. E. Rogers 09/25/91
284 Tests of Prototype Phase Calibration Pulse Generator A. E. E. Rogers 10/07/91
285 Write Driver Improvements D. Smythe 10/04/91
286 Head Wear Rates with Fotoceram Spacers A. E. E. Rogers 10/21/91
287 Recorder Telecon Held 9 October 1991 at 1300 EST A. E. E. Rogers 10/10/91
288 Progress Report on the Solution To the Tape Edge Heating Problem A. E. E. Rogers, H. F. Hinteregger 10/22/91
289 Recorder Test Procedures G. Peck, A. E. E. Rogers 09/13/91
290 Configuration of Tape Path for Thin Tape and High Speed H. F. Hinteregger, A. E. E. Rogers 02/12/92
291 Bar-Code Reader on VLBA Transport A. R. Whitney 11/29/91
292 Minutes of Recorder Group Telecon Held 11 December 1991 at 1300 EDT A. E. E. Rogers 12/12/91
293 The Effect of the Reel Hub on Tape Pack A. E. E. Rogers, H. F. Hinteregger 12/18/91
294 Septum Interference with Precision Plate K. M. Wilson 02/05/92
295 Minutes of Recorder Group Telecon Held 12 February 1992 at 1300 EDT A. E. E. Rogers 02/13/92
296 Summary of Results of Thin Tape Inspections A. Sandler, H. F. Hinteregger, A. E. E. Rogers, N. Donald, D. Sousa 02/19/92
297 Tests of Phase Calibration Pulse Generator from 22-43 GHz A. E. E. Rogers 02/20/92
298 Plan for Accelerated Testing of Thin Tape A. E. E. Rogers 02/27/92
299 DRAFT - Tape Procurement Specification A. E. E. Rogers, H. F. Hinteregger 05/19/92
300 Measured Tolerance on Reel Table Alignment A. E. E. Rogers, H. F. Hinteregger 03/05/92
301 Mechanical Upgrade Steps A. E. E. Rogers, K. M. Wilson, H. F. Hinteregger 03/06/92
302 Mechanical Model for Reel Table Alignment Needed for Low Speed Running A. E. E. Rogers 03/12/92
303 Head Assembly Mounting Screws Bottoming out on the High Performance Damper D. Fields 03/10/92
304 Minutes of Recorder Telecon held 8 April 1992 at 1300 EDT A. E. E. Rogers 04/09/92
305 Head Flying: Expected Changes with Head Wear A. E. E. Rogers 04/30/92
306 Differences in the VLBA, MkIII and MkIV IF To Baseband Conversion A. E. E. Rogers 05/04/92
308 Tape Edge Abrasion by Contact with Reel Flange Rims A. E. E. Rogers, H. F. Hinteregger 06/22/92
309 Possible Replacements for the 10G070 Dual Modulus Counter A. E. E. Rogers 05/19/92
310 More on the Abrasion of Tape Edges by Reel Flanges A. E. E. Rogers 05/27/92
311 Recorder Controller Monitor Board Changes E. Nesman, V. Tran, K. Wilson 05/28/92
312 Tape Canister Drop Tests A. E. E. Rogers, H. F. Hinteregger 07/10/92
313 Some Calculations of Forces Experienced by Tapes When Dropped A. E. E. Rogers 06/92
314 Minutes of VLBA Recorder Telecon Held 10 June 1992 at 1300 EDT A. E. E. Rogers 06/11/92
315 Low Melting Point of Oxide Binder in AMPEX 741 Tape A. E. E. Rogers, D. Callahan 06/17/92
316 Version 6 of RECON R. Cappallo 06/15/92
317 Elastic Modulus Measurements for Thin Tape D. Callahan, A. E. E. Rogers 06/18/92
318 Tape Loop Clearance Tolerance A. E. E. Rogers 06/23/92
319 Tape Winding and Stretched Tape A. E. E. Rogers 06/25/92
320 Wear Tests on Short Tapes A. E. E. Rogers 07/30/92
321 Factors Which Influence the Tape Wind Test A. E. E. Rogers 07/01/92
322 The Effect of Debris on Tape Packing A. E. E. Rogers 07/92
323 Accelerated Thin Tape Test: Status Report A. E. E. Rogers 07/06/92
324 A Simple Method To Measure Friction in Vacuum Columns A. E. E. Rogers 07/21/92
325 Elastic Modulus in the Radial Direction for Thin Tapes A. E. E. Rogers, D. J. Callahan 07/13/92
326 Edge Guiding Force Variation with Vacuum Door Clearance A. E. E. Rogers 07/23/92
327 A Physical Model for the Effect of Relative Humidity on Edge Contact Deposits A. E. E. Rogers 07/28/92
328 Humidity Tests of the Tape Cannister D. Callahan, A. E. E. Rogers 08/04/92
329 Proposal for Bypassing Barrel Roll and System Track Substitution When Using the VLBA Formatter Data Buffer Module C. Janes, R. Treacy 07/24/92
330 Capstan and Idler Alignment Tests A. E. E. Rogers, K. Wilson, H. F. Hinteregger 08/07/92
331 Cost Estimate for Thin Tape Upgrade A. E. E. Rogers, H. F. Hinteregger, M. W. McDonough 08/04/92
332 Magnetic Tape Surface Resistivity Variation with Relative Humidity D. Callahan, A. E. E. Rogers 08/05/92
333 Thin Tape Upgrade - Changes/Additions To VLBA Acquisition Memo #290 A. E. E. Rogers, H. F. Hinteregger, K. Wilson 09/04/92
334 Influence of Axis Misalignment on Edge Guiding Force A. E. E. Rogers 08/07/92
335 Types of Deposit and Their Independence on Humidity A. E. E. Rogers 08/26/92
336 16 Passes with a 2 µm Guard Band D. Smythe 08/21/92
337 Preliminary MCB Protocol for Digital Switch and Tone Extractor A. E. E. Rogers, E. F. Nesman 10/05/92
338 Minutes of VLBA Tape Review Meeting Held 14 September 1992 A. E. E. Rogers 09/16/92
339 Record Spacing Loss Measurement for D1 Tape A. E. E. Rogers 09/23/92
340 Accelerated Thin Tape Tests: Status Report Update A. E. E. Rogers 09/29/92
341 Failure of Ampex Tape Under Low Humidity Conditions A. E. E. Rogers, H. F. Hinteregger 10/14/92
342 Theoretical Wear Profiles for Headstack with Soft Spacers A. E. E. Rogers, H. F. Hinteregger 10/08/92
343 Minutes of Telecon held 9 December 1992 at 1300 EDT A. E. E. Rogers 12/10/92
344 Minutes of VLBA Recorder Telecon, Held 1300 EST 14 Oct 92 A. E. E. Rogers 10/15/92
345 Update of Self-Packing Reel Specifications H. F. Hinteregger 12/07/92
346 Further Improvement of Write Driver Peformance V. A. Tran, K. M. Wilson 12/31/92
347 Digital Tone Extractor Normalization A. E. E. Rogers 01/08/93
348 Robust and Marginal Tapes: The Shape-of-Edge Difference, Extreme Wind and Shuttle Tests, High Tg Ampex Samples Looking Good H. F. Hinteregger 01/08/93
349 Thin Tape Upgrade - Summary of Parts, Drawings, Assembly and Test A. E. E. Rogers, K. Wilson, G. Peck, H. Hinteregger 02/02/93
350 Version 7 of RECON R. Cappallo 01/27/93
351 Minutes of VLBA Recorder Telecon Held 17 February 1993 at 1300 EST A. E. E. Rogers 02/18/93
352 Headstack Specification for Mk3A/VLBA/Mk4 Compatibility (REF. DWG. 6310-116) H. Hinteregger 03/11/93
353 Suggested Use of NPN Transistor in BBC Oscillator for Lower Phase Noise A. E. E. Rogers 03/30/93
354 Local Oscillator Phase Stability Specification for the Baseband Converter Modules A. R. Thompson 03/11/93
355 Minutes of Recorder Telecon Held 21 April 1993 at 1300 EDT A. E. E. Rogers 04/26/93
356 Methods for Further Reduction in Head Flying and Head Wear A. E. E. Rogers 05/24/93
357 Minutes of Telecon Held 16 June 1993 at 1300 EDT A. E. E. Rogers 06/25/93
358 Tape Packing at Low Tensions C. Lam, A. E. E. Rogers 07/26/93
359 Playback Drive Inrush Current, Thermistor Tests B. Martin 07/23/93
360 Simple Method of Checking Reel Motor Torque A. E. E. Rogers 08/09/93
361 Reel Servo Stability Margin A. E. E. Rogers 08/93
362 An Evaluation of the Jodrell Bank Headstacks A. E. E. Rogers, P. Bolis, H. F. Hinteregger 08/02/93
363 Performance Maintenance and Head Wear H. F. Hinteregger 08/04/93
364 The Accelerated Tape Test C. Janes 08/03/93
365 Preliminary Tests of Modified "Triple Cap" Contour A. E. E. Rogers 08/12/93
366 Methods of Remotely Monitoring Power Supply Voltages In VLBA Equipment Racks B. Martin 08/17/93
367 Procedure for Testing Frequency Response of R131 Read Modules and R132 Parallel Reproduce Modules for the VLBA Tape Recorder B. Martin 08/20/93
368 Wear Rates, Head Flying and Performance of the Current Head Design at Various Operating Tensions C. Lam, A. E. E. Rogers, H. Hinteregger 09/01/93
369 Wear Rates for Heads With Fotoceram and MN130 Spacer Material A. E. E. Rogers 09/08/93
370 Test procedure for R131 Read Modules and R132 Parallel Reproduce Modules D. Smythe, P. Bolis 09/16/93
371 Reel servo/driver configuration and Margin Analysis, Recommendations for More Reliable Operation at 320 ips Maximum H. F. Hinteregger 09/24/93
372 Contours of "Triple-Cap" Heads A. E. E. Rogers 10/20/93
373 Recorder Telecon Held 20 October 1993 at 1300 EDT A. E. E. Rogers 10/25/93
374 Accelerated Thin Tape Test II C. Janes 11/01/93
375 Model for Recorder Tracking Response To Capstan and Idler Surface Irregular A. E. E. Rogers 11/24/93
376 Missing 05/93
377 Thin Tape Transfer Status C. Janes 12/14/93
378 Tolerances for VLBA Sampling Level D. Bagri 02/07/94
379 Recovery of Shock-Deformed Tape H. F. Hinteregger, D. L. Smythe 03/14/94
380 Minutes of VLBA Recorder Telecon Held 16 February 1994 A. E. E. Rogers 02/18/94
381 Minutes of Recorder Telecon Held 20 April 1994 at 1300 EDT A. E. E. Rogers 0$/25/94
382 Minutes of VLBA Recorder Telecon Held 15 June 1994 at 1300 EDT A. E. E. Rogers 08/94
383 Minutes of VLBA Recorder Telecon Held 17 August 1994 A. E. E. Rogers 08/30/94
384 Measurements of Recorder Head Profiles and Changes in the Profile with Tape Speed S. Gross, A. E. E. Rogers, H. F. Hinteregger 10/94
385 Minutes of Telecon Held 19 October 1994 at 1300 EDT A. E. E. Rogers 10/20/94
386 Minutes of Recorder Telecon held 21 December 1994 at 1300 EDT A. E. E. Rogers 12/22/94
387 Minutes of VLBA Recorder Telecon Held 21 December 1994 at 1300 EDT H. F. Hinteregger 02/17/95
388 Much Better than Expected Thin-film MR Head Performance Observed H. F. Hinteregger 03/25/95
389 Minutes of Recorder Telecon Held 19 April 1995 at 1300 EST A. E. E. Rogers 04/20/95
390 Modellings and Evaluation of the Current Head-Stack S. Müftü 05/10/95
391 The Effect of Air Flow and Tension on the Exit Side Behavior of a Flat Contoured Recording Head S. Müftü 05/09/95
392 Minutes of Telecon Held 20 December 1995 at 1:00 P.M. EST A. E. E. Rogers 12/21/95
393 Mark IIIA/IV/VLBA Tape Formats, Recording Modes, and Compatibility A. R. Whitney 12/27/95
394 Summary of Specifications for Geodetic 14-BBC DAR F. Ghigo 01/31/96
395 Minutes of 1st International Telecon on VLBI Recording held on 8 February 1996, 10:00 A.M. EST [15:00 UT] H. F. Hinteregger 02/28/96
396 Minutes of Telecon Held November 7th, 1996, 10:05-11:30 am (EST) H. Hinteregger, S. Müftü 01/09/97
397 Modelling Results on the Long Term Reliability of the Flat Head Interface: I S. Müftü 03/04/97
398 Minutes of VLBA Recording Telecon Held on 13 February 1997 G. Peck 06/13/97
399 VLBA One Gigabit per Second Tape Drive Upgrade G. Peck, S. Durand 03/27/00
400 NRAO Clock Recovery Test Fixture Senior Design Project F. Martinez, M. Nunez, S. J. Padilla 05/09/01
401 Formatter Upgrade 512 Mbps S. Durand, D. McKee 08/02/01 Original
402 VLBA Thin Tape Recorder Module QA, Calibration and Support Documents S. Thompson 08/02 Original
403 Sampler QA Procedure S. Durand, D. Gerrard 02/04 Original
404 Mark 5 Module Assembly Instruction D. Gerrard 06/04 Original
405 Remote Power Up Feature for the Mark 5 Data Recording Units D. Gerrard 07/04 Original





      Modified on Friday, 11-Mar-2016 15:23:20 EST by Library Staff