TechnologyObserving FacilitiesEducation and OutreachAbout Haystack

Mark 4 Memo Series

(see VLBA Memos 71 238) *(This is also Mark IV Internal Memo #IM11) A.R. Whitney
                     
ACROBAT YOU WILL NEED TO DOWNLOAD ACROBAT READER FOR ALL PDF FILES                
1990                      
001 18May90 Proposal for a Cost Effective Doubling of Existing VLBI Sensitivity A.R. Whitney              
002 23OCT90 East Coast VLBI Group The Mark IV VLBI System - the Next Step A.R. Whitney              
003 01NOV90 Preliminary Mark IV Formatter Specification A.R. Whitney              
004 29AUG90 Comparison of OS-9 and VxWorks ---                
005 06JAN91 Another Consideration for Mark IV D.B. Shaffer              
006 08JAN91 Mark IV Formatter Spec. - Draft 2 A.R. Whitney              
007 06MAR91 Limitations in recording high frequencies with the VLBA record electronics A.E.E. Rogers              
008 14MAR91 TAXI Fleet for MKIV and V H.F. Hinteregger              
009 01APR91 ACL for Write Driver H.F. Hinteregger              
010 05JUN89 152 A magnetic circuit model for the VLBA headstack A.E.E. Rogers              
011 27DEC89 184 Wavelength Dependence of D1 and MET VLBA "Headcurves" A.E.E.Rogers              
012 09JAN90 187 Tape Noise Measurements of D1K & S-VHS A.E.E. Rogers              
013 30JAN90 190 A Quick Test of 8mm Evaporated Metal Tape (MET) A.E.E. Rogers              
014 02FEB90 195 Tests of Parallel Playback Electronics A.E.E. Rogers E.F. Nesman            
015 27JUN90 207 Measurements of record spacing loss and numerical model to evaluate the effect of A.E.E. Rogers S. Deligeorges            
016 27JUN90 208 Tests of a method to support thick and thin tape on a processor transport A.E.E. Rogers S. Deligeorges            
017 17JUL90 210 Tests of the VLBA Read/Write Interface A.E.E. Rogers H.F.Hinteregger            
018 17JUL90 211 Record Cross-talk Theory A.E.E. Rogers D.L. Smythe            
019 13AUG90 214 Some Tests of the TI TL592B Amplifier A.E.E. Rogers S. Deligeorges J. Hargreaves          
020 06SEP90 220 Dummy Headstack Post for Improved Tracking Symmetry A.E.E. Rogers H.F.Hinteregger P. Bolis          
021 04OCT90 225 Preliminary report on First VLBA Tapes A.E.E. Rogers H.F. Hinteregger D.L. Smythe P.Bolis        
022 19OCT90 226 Thin Tape Facts H.F. Hinteregger              
023 30NOV90 228 Tape winding and tape thickness non- uniformity A.E.E. Rogers              
024 04DEC90 229 Update on the AMPEX/MAXELL tape packing problem A.E.E. Rogers              
025 232 Edge slitting signatures and edge quality of 16 mm tapes A.E.E. Rogers              
026 31DEC90 233 Dynamic forces on the tape edge A.E.E. Rogers              
027 19JAN91 236 Tape Elastic Constant Check via Tape Winding A.E.E. Rogers H.F.Hinteregger            
028 18JAN91 237 Methods of Measuring Headstack Gap Length A.E.E. Rogers H.F. Hinteregger            
029 31JAN91 241 Revised Model for VLBA Head Efficiency A.E.E. Rogers              
030 14FEB91 243 Capacitance of Gapped Bars D.L. Smythe              
031 25FEB91 245 Efficiency variations in VLBA headstacks A.E.E. Rogers              
032 27FEB91 246 Scanning Electron Microscope (SEM) Gap Length Measurement H.F. Hinteregger              
033 17MAY91 252 How Head SNR Affects Reproduce Performance D.L. Smythe              
034 12JUN91 254 Calculations concerning air entrapment at the headstack and the maintenance of good head-to-tape contact A.E.E. Rogers              
035 10JUN91 256 Tape profile along the headstack A.E.E. Rogers              
036 17JUN91 257 Dynamic Friction and Viscous Drag in the Vacuum Columns A.E.E. Rogers              
037 11JUL91 258 Write Driver Asymmetry Improvements V.A. Tran A.E.E. Rogers            
038 17JUN91 259 Head to tape contact at 320 IPS with thin tape D.L. Smythe              
039 18JUN91 260 Performance of Mark IIIA Recorder at 56 kbpi D.L. Smythe              
040 27JUN91 262 Vacuum Column Air Bearing Clearance A.E.E.Rogers              
041 8JUL91 263 Tape Winding Dynamics A.E.E.Rogers              
042 2JUL91 264 Theoretical Model for Head Flying A.E.E.Rogers              
043 10JUL91 265 Simple method of measuring edge curl A.E.E.Rogers              
044 15JUL91 266 Thermal Calculations for High Tape Speeds A.E.E. Rogers              
045 15JUL91 268 Slipping Capstans A.E.E. Rogers              
046 17JUL91 269 Accelerated tape wear tests A.E.E. Rogers              
047 12JUL91 270 VLBA Write Driver at 18 Mb/s D.L. Smythe              
048 31JUL91 271 Method of contouring heads for high tape speeds A.E.E. Rogers              
049 02AUG91 272 Spacing loss from uneven wear of headstacks A.E.E. Rogers/ H.F. Hinteregger            
050 23AUG91 273 Magnetic Tape "Flying" Measurements vs Model A.E.E. Rogers J. Starr            
051 08AUG91 274 Preliminary tests of various low friction Surfaces A.E.E. Rogers              
052 21AUG91 276 Quality Control Checks for Inch-Worm Drivers D.L. Smythe              
053 22AUG91 277 Modifying the VLBA Head Interface for Recording at 18 Mbs D.L. Smythe              
054 21OCT91 279 Reel Alignment Tolerance A.E.E. Rogers              
055 23OCT91 280 Reels for thin tape H.F. Hinteregger A.E.E. Rogers            
056 30AUG91 281 Possible variations on the vacuum loop A.E.E. Rogers              
057 17SEP91 282 Additions to head flying model and comparison with measurements A.E.E. Rogers              
058 25SEP91 283 Preliminary tests of new and experimental Headstacks A.E.E. Rogers              
059 04OCT91 285 Write Drive Improvements D.L. Smythe              
060 21OCT91 286 Head wear rates with Fotoceram spacers A.E.E. Rogers              
061 22OCT91 288 Progress report on the solution to the tape edges heating problem A.E.E. Rogers H.F. Hinteregger            
062 26NOV91 Mark 4 Drawings R. Cady E. Nesman
063 27SEP91 267 Tape (thin) and transport handling procedures A.E.E. Rogers H.F. Hinteregger
064 12FEB92 290 Configuration of Tape Path for Thin Tape and High Speed H.F. Hinteregger A.E.E. Rogers            
065 29NOV91 291 Bar-code Reader on VLBA Transport A.R. Whitney              
066 12DEC91 293 The Effect of the Reel Hub on Tape Pack H.F. Hinteregger A.E.E. Rogers            
067 02FEB92 298 Plan for accelerated testing of thin tape A.E.E. Rogers              
068 03MAR92 299 Tape Procurement Specification A.E.E. Rogers, H.F. Hinteregger            
069 05MAR92 300 Measured Tolerance on reel table alignment A.E.E. Rogers, H.F. Hinteregger            
070 05MAR92 301 Mechanical Upgrade Steps A.E.E. Rogers, K.M.Wilson, H.F. Hinteregger          
071 14APR92 Mark 4 Head-Numbering Conventions A.R. Whitney              
072 05MAY92 Changes to MkIII Video Converter to Extend Bandwidth to 16 MHz A.E.E. Rogers              
073 05FEB92 294 Septum Interference with Precision Plate K.M. Wilson              
074 18FEB92 296 Summary of Results of Thin Tape Inspections A.Sandler, H.Hinteregger, A.Rogers, N.Donald, D. Sousa      
075 12MAR92 302 Mechanical Model for Reel Table Alignment Needed for Low Speed Running A.E.E. Rogers              
076 10MAR92 303 Head Assembly Mounting Screws Bottoming Out of the High Performance Damper D. Fields              
077 30APR92 305 Head Flying: Expected Changes with Head Wear A.E.E. Rogers              
078 05MAY92 306 Differences in the VLBA, MkIII, & MkIV IF to Baseband Converter A.E.E. Rogers              
079 07MAY92 307 Tolerance of Tape Clearance in Vacuum Column A.E.E. Rogers              
080 19MAY92 308 Tape Edge Abrasion by Contact with Reel Flange Rims A.E.E. Rogers              
081 12JUN92 4-Level sampling threshold sensitivity with the Bos chip A.E.E. Rogers              
082 15JUN92 Some Loss Factors A.E.E. Rogers              
083 18JUN92 Pass Locations D.L. Smythe              
084 23JUN92 Channel Track Assignments D.L. Smythe A.R. Whitney            
085 27MAY92 310 More on the abrasion of tape edges by reel flanges A.E.E. Rogers              
086 01JUN92 312 Preliminary Tape Canister Drop Tests A.E.E. Rogers H.F.Hinteregger            
087 01JUN92 313 Some Calculations of forces experienced by tapes during shipment A.E.E. Rogers H.F. Hinteregger            
088 15JUN92 316 Version 6 of RECON R.J. Cappallo              
089 18JUN92 317 Elastic modulus measurements for thin tapes D.Callahan A.E.E. Rogers            
090 23JUN92 Interim Report on Correlator Chip Study for Mark IV Correlator A.R. Whitney              
091 19JUN92 Correlator Chip Internal Data Paths J.I. Levine              
092 25JUN92 ASIC Pricing W. Aldrich              
093 16JUN92 ASIC Pricing (Again) W. Aldrich              
094 23JUN92 318 Tape loop clearance tolerance A.E.E. Rogers              
095 25JUN92 319 Tape winding and stretched tape A.E.E. Rogers              
096 30JUN92 320 Wear tests on short tapes A.E.E. Rogers              
097 01JUL92 321 Factors which influence the tape wind test A.E.E. Rogers              
098 02JUL92 322 The effect of debris on tape packing A.E.E. Rogers              
099 06JUL92 323 Accelerated thin tape tests: Status Report A.E.E. Rogers              
100 13OCT92 Upgrade to Mark IV Data-Acquisition Capability D. Smythe              
101 27OCT92 Addition of acceleration to Mark IV on-chip phase-rotor A.R. Whitney              
102 28OCT92 Correlator software documentation C.J. Lonsdale              
103 04NOV92 Reproduce at 18 Mb/s - Preliminary Results D.L. Smythe              
104 05NOV92 Delay/phase tracking in the MKIV Correlator A.R. Whitney              
105 21JUL92 324 A simple method to measure friction in vacuum columns A.E.E. Rogers              
106 13JUL92 325 Elastic modulus in the radial direction for the tape D. Callahan A.E.E. Rogers            
107 23JUL92 326 Edge guiding force variation with vacuum door clearance A.E.E. Rogers              
108 28JUL92 327 A physical model for the effect of relative humidity on edge A.E.E. Rogers              
109 04AUG92 328 Humidity tests of the tape canister D. Callahan A.E.E. Rogers            
110 03AUG92 330 Capstan & Idler Alignment Tests A.E.E. Rogers K. Wilson            
111 04AUG92 331 Cost estimate for thin tape upgrade A.E.E. Rogers H.F. Hinteregger M.W. McDonough          
112 05AUG92 332 Magnetic tape surface resistivity variation with relative humidity D. Callahan A.E.E. Rogers            
113 05AUG92 333 Thin Tape Upgrade - Changes/Additions to VLBA Acquisition Memo #290 A.E.E. Rogers H.F. Hinteregger            
114 07AUG92 334 Influence of axis misalignment on edge guiding force A.E.E. Rogers              
115 26AUG92 335 Types of deposit and their dependence on humidity A.E.E. Rogers              
116 21AUG92 336 16 Passes with a 2 mm Guard Band D.L. Smythe              
117 23SEP92 339 Record Spacing Loss Measurement for D1 Tape A.E.E. Rogers              
118 29SEP92 340 Accelerated thin tape tests:Status report update A.E.E. Rogers              
119 14OCT92 341 Failure of Ampex tape under low humidity conditions A.E.E. Rogers H.F. Hinteregger            
120 07OCT92 342 Theoretical wear profiles for headstacks with soft spacers A.E.E. Rogers H.F. Hinteregger            
121 27OCT92 Mark 4 Station Unit -- Preliminary Specification R. Cappallo A.R. Whitney            
122 16NOV92 Lag-dependent phase corrections A.E.E. Rogers              
123 20NOV92 Implementation of Delay/phase tracking in MKIV Correlator A.R. Whitney              
124 OCT92 001 NFRA-ITR 199 on Correlator Architectures (NFRA ITR 199) A. Bos              
01DEC92                    
125 01DEC92 Notes on the Dual 2*2 Chip Layout J.I. Levine              
126 02DEC92 Preliminary Evaluation of a Gigabit-Rate Chip set for Data Communication (G-Link) D.L. Smythe              
127 11DEC92 Validity Bits and Data Normalization B. Anderson              
128 05JAN93 Three correlation schemes with X and Y validity A.E.E. Rogers              
129 06JAN93 Summary of proposed SMA correlator architecture J.I. Levine A.R. Whitney            
130 08JAN93 Robust and Marginal Tapes:The Shape-of-Edge Difference, Extreme Wind and Shuttle Tests, High Tg Ampex Samples Looking good H.F. Hinteregger              
131 07DEC92 345 Update of Self-Packing Reel Specifications H.F. Hinteregger              
132 31DEC92 346 Further improvement of write driver performance V.A. Tran K.M. Wilson            
133 08JAN93 347 Digital tone extractor normalization A.E.E. Rogers              
134 11JAN93 Haystack Head Stacks at 18 Mb/s D.L. Smythe              
135 11JAN93 Using a Single Squash Plate for Mark IV Tape Drives D.L. Smythe              
136 16FEB93 Vernier-Delay Control for Multiplexed Data in Correlator Array A.R. Whitney              
137 17FEB93 The Mark IV Tape Format - Revision 1.0 A.R. Whitney              
138 23FEB93 Expected correlation between sign and magnitude bits A.E.E. Rogers              
139 01MAR93 Redesigned 32-MHz synthesizer A.E.E. Rogers              
140 24FEB93 003 The EVN/Mark IV Station Unit Requirements B. Anderson              
01MAR93                    
141 02MAR93 004 The EVN/Mark IV Station Unit: Straw-Man Design B. Anderson              
24FEB93                    
142 03MAR93 Numerical Coding W. Aldrich              
143 08MAR93 Current state of postprocessing and archive subsystem software under UNIX C. Lonsdale              
144 11MAR93 Headstack Specification for MK3A/VLBA/- MK4 Compat H.F. Hinteregger              
144.1 Stepped and triple-cap headstack specification for VLBI tape recorder H.F. Hinteregger              
144.2 Stepped and triple-cap headstack specification for VLBI tape recorder H.F. Hinteregger              
144.3 03032000 Stepped and triple-cap headstack specification for VLBI tape recorder H.F. Hinteregger              
145 27JAN93 349 Thin Tape Upgrade - Summary of Parts, Dwgs, Assy & Test A.E.E. Rogers K.M. Wilson H.F. Hinteregger G. Peck,        
146 27JAN93 350 Version 7 of RECON R.J. Cappallo              
                   
147 30MAR93 353 Suggested BBC Oscillator Improvements A.E.E. Rogers              
148 19MAR93 Normalization for Mark IV with Mark III Correlator A.E.E. Rogers              
149 31MAR93 Correlator Chip Design Review W.Aldrich              
150 27APR93 MKIII BBC AGC options for 2-bit data A.E.E. Rogers              
151 26MAY93 Summary of 25 May 1993 Mark IV Meeting A.R. Whitney              
152* 29APR93 Summary of 27 April 1993 Mark IV Meeting A.R. Whitney              
                   
153 02JUN93 The Fabrication of a High Speed Cross Point Switch J. Goodman              
154 03JUN93 Summary of 1 June 1993 Software Group Meeting A.R. Whitney              
155 09JUN93 Summary of 8 June 1993 Mark IV Meeting A.R. Whitney              
156 04AUG93 363 Performance maintenance and head wear H.F. Hinteregger              
157 24MAY93 356 Methods for further reduction in head flying and Head Wear A.E.E. Rogers              
158 26JUL93 358 Tape Packing at Low Tensions A.E.E. Rogers C. Lam            
159 02AUG93 360 Simple method of checking reel motor torque A.E.E. Rogers              
09AUG93 Revision                
160 02AUG93 361 Reel servo stability margin A.E.E. Rogers              
161 02AUG93 362 An evaluation of the Jodrell bank headstacks A.E.E. Rogers P.G. Bolis H.F. Hinteregger          
162 12AUG93 365 Preliminary tests of modified "triple cap" contour A.E.E. Rogers              
163 01SEP93 368 Wear rates, head flying and performance of the current head design at various operating tensions C. Lam              
164 07SEP93 369 Wear rates for heads fotoceram and MN130 spacer materials A.E.E. Rogers              
165 10SEP93 Summary of Mark IV-related meetings - week of 7 September 1993 A.R. Whitney              
166 16SEP93 370 Test procedure for R131 Read Modules and R132 Parallel Reproduce Modules D.L. Smythe P.G. Bolis            
167 24SEP93 371 Reel Servo/Driver Configuration and Margin Analysis Recommendations for More Reliable Operation at 320 ips Maximum H.F. Hinteregger              
168 14SEP93 A-file format and related issues C.J. Lonsdale              
169 22OCT93 Transmission Line Simulator Tests J.I. Levine              
170 22OCT93 MKIV Root File Formats C.J. Lonsdale              
171 22OCT93 MK4 Formatter FPGA Configuration Control J.I. Levine              
172 22OCT93 014 Mark4/EVN Data Distribution Network Simulation J.I. Levine              
173 22OCT93 Linkdata program and AFIO library changes C.J. Lonsdale              
174* 05OCT93 012 Hardware Interface Specification Correlator Input Board to Backplane D.L. Smythe A. Bos            
174.2* 21MAR94 REVISED (REPLACES MK4 MEMO #195)                
175 07APR94 System Data Interface Specification                
176 28MAR91 248 Proposed phase cal extractor for upgraded formatter A/D board A.E.E. Rogers              
177 01APR93 249 Proposed redesign of the formatter A/D buffer module A.E.E. Rogers E.F. Nesman            
178 27OCT93 017 Notes of Mark IV Station-Unit Phase-Calibration Tone Extraction A.R. Whitney R.J. Cappallo E.F. Nesman          
179 27OCT93 016 Detailed format of Mark III and Mark IV track- frame header A.R. Whitney              
180 03NOV93 PLL Clock Driver Timing J.I. Goodman J.I. Levine            
181 05NOV93 021 Correlator-Board Backplane-Interface Signal Requirements W.H. Aldrich J.I. Goodman            
182 01OCT93 006A The EVNFRA Correlator: Design Considerations A. Bos              
NFRA-ITR 202 (Revision1)                
183 15MAR93 005 DZB and EVN Correlator Data Distribution Study NFRA Note 612 R.P. Millenaar              
184 23NOV93 023 Header Data Format W.A. Aldrich              
185 23NOV93 Revised Head Block Design H.F. Hinteregger, A.E.E. Rogers, D.L. Smythe          
186 20OCT93 372 Contours of "Triple-cap"-Heads A.E.E. Rogers              
187 23NOV93 375 Model for recorder tracking response to capstan and idler surface irregularities A.E.E. Rogers              
188 24NOV93 Increasing the band-width of the Mark IV preamplifier to MHz D.L. Smythe              
189 11JAN94 Upgrades to video converters for 16 MHz bandwidth A.E.E. Rogers              
189.1 10JUN94 Revision 1                
190 22NOV93 Clock Signal from SMA Data Receivers J.I. Levine              
191 29DEC93 031 Correlator Board Hardware Specification J.I. Goodman              
192 12JAN94 Summary of VLSI chip-simulation Meeting A.R. Whitney              
193 08FEB94 Correlator Board Software Development J.I. Goodman              
194 11FEB94 System-level diagrams for the weak-minded A.R. Whitney              
195 14FEB94 Hardware Interface Specification Correlator Input Board to Backplane D.L. Smythe              
174.2* 21MAR94 ***REPLACED BY REVISED MK4 MEMO #174.2,                
196 14FEB94 038 PBU Interface to the SU and the CCC R.J. Cappallo              
197 20JAN94 Distributing data without a Data Distributor D.L. Smythe              
198 15DEC94 039 Serial Link Interface Specification D.L. Smythe              
199 17FEB94 New A-file format C.J. Lonsdale              
200 24FEB94 040 PBU to SU Hardware Interface Specification D.L. Smythe              
201 21MAR94 New Timing Requirements for DATA to the Correlator Board D.L. Smythe J.I. Goodman            
202 01APR94 Some of the results of the "post-mortem" performed on Headstack E80 P. Bolis              
203 14MAR94 379 Recovery of Shock-Deformed Tape H.F. Hinteregger D.L. Smythe            
204 03JUN94 Crosspoint Switch Functional Tests J.I. Levine              
205* 12JUL94 Mark IV Tape Format, Recording Modes & Compatibility A.R. Whitney              
205.2* 19DEC94 *205.2-6 has been superceded by Mark IV Memo #230                
205.3* 06MAR95                    
205.4* 24MAR95                    
205.5* 04APR95                    
205.6* 04JUN95                    
206 12AUG94 Correlator Back Plane Switching #81 Submillimeter Array Technical Memorandum A. Dowd              
207 18AUG94 Crate Controller to Correlator Board Software Interface J. Goodman              
207.1 28JUL95                    
208 24AUG94 Software Development Tasks for the HP 742 crate controller N. Sitkoff J. Goodman            
209 14SEP94 Timing of Clock, Data, BOCF, and Control Signals at Correlator Backplane Pins J. Goodman              
209.1 12DEC94                    
210 28SEP94 384 Measurements of Recorder Head Profiles and Changes in the Profile with Tape Speed S. Gross A.E.E. Rogers H.F. Hinteregger          
211 07NOV94 Strategies in searching for "TOT" R.J. Cappallo             
212 31JAN95 The `Haystack' 66x64 Crossbar Switch J. Goodman              
213 25MAR95 388 Much Better than Expected Thin-film MR Head Performance Observed H.F. Hinteregger              
214 22FEB95 Correlator Board Data and Configuration Management A.R. Whitney              
215 10MAY95 390 Modelling and Evaluation of the Current Headstack S. Müftü              
216 09MAY95 391 The Effect of Air Flow and Tension on the Exit Side Behavior of a Flat Contoured Recording Head S. Müftü              
217 26MAY95 Meeting with Navell A.R. Whitney              
218 30MAY95 Meeting with Corwil A.R. Whitney              
219 02JUN95 Adding Application Specific Software Routines To Core DSP Software J. Goodman              
219.1 28JUL95                    
219.2 01MAY96                    
220 26APR95 Correlator Chip Pipeline Defect W. Aldrich              
221 28MAR94 Derivation of Linear and Quadratic Fits to an Input Spline Polynomial R. Cappallo              
222 02NOV94 Station Unit Spline Polynomial Evaluation R. Cappallo              
223 24AUG95 SYSTICK Generator D.L. Smythe              
224 14SEP95 System Sync Generator D.L. Smythe              
225 14DEC93 CMOS Correlator Preliminary Revision 0.03 J. Canaris W. Aldrich            
226 10JUN93 The Haystack VLSI Correlator Chip Preliminary W. Aldrich A.R. Whitney            
227 01SEP95 Input Board Functional Description Preliminary W. Aldrich              
227.1 01DEC95                    
228 01JUN95 Final Report - Evaluation of TF/MR Head with Advanced Tape H.F. Hinteregger              
229 08DEC95 Contact Tape Recording with a Flat Head Contour H.F. Hinteregger              
230A 10JUN05 393 Mark IIIA/IV/VLBA Tape Formats, Recording Modes and Compatibility *Supercedes Memo #205 + Revisions A.R. Whitney              
231 19JAN96 Report on "IACC Review Meeting", 11-12 Jan 1996, Dwingeloo A.R. Whitney              
232 23FEB96 First Results of Mark IV Formatter Tests D.L. Smythe A.R. Whitney            
233 28FEB96 395 Minutes of 1st International telecon on VLBI Recording held on 8 February 1996, 10:00 A.M. H.F. Hinteregger              
234 06MAR96 Correlator System Temperature Measurements J. Goodman K. Wilson            
235 29MAR96 Poor image rejection in MkIV converters A.E.E. Rogers              
236 30APR96 Thermal Testing of the Correlator Chip Jian-Jin Tuan              
237 --APR96 NFRA Internal Technical Report, ITR 207, The Haystack Correlator Chip A.Bos, W.Aldrich, A.Whitney          
238 23APR96 VLBA Test Memo No. 52, Mark 4 Format Test J.D. Romney              
239 29APR96 Definition and Management of Correlator-Board DSP Routines A.R. Whitney J.I. Goodman            
240 04JUN96 The Haystack 66x64 Crossbar Switch Haystack Mk IV                
241 08OCT96 Mechanics and Tribology of Recording with a Flat Top Head Sinan Müftü              
242 05NOV96 Junction Temperature Tests W. Aldrich              
243 05DEC96 Mark IV Development Group D.L. Smythe              
244 09JAN97 Minutes of Telecon held November 7th, 1996, 10:05-11:30 am (EST) H.F. Hinteregger S. Müftü            
245 23JAN97 Mezzanine Board Interface Specification for CFA J.I. Goodman              
246 04MAR97 Modeling Results on the Long Term Reliability of the Flat Head Interface S. Müftü              
247 21MAR97 A DSP read channel for increased linear density in VLBI tape recording J.I. Goodman              
248 02MAY97 The Current Status of the Thin Film Head Project H. F. Hinteregger S. Müftü            
249 12MAY97 Specification footnote of Cypress Semiconductor PLL Clock driver J.I. Goodman              
250 05JUNE97 Notes on setting of rotator/vernier-delay paramaters A.R. Whitney              
251 05JUNE97 Clarification of Mark IV data codes A.R. Whitney              
252 24JUNE97 397 Spacing-Loss vs. Speed in 'Stepped' and 'Triple-Cap' Heads H.F. Hinteregger              
253 09JULY97 Timing recovery and gain control for proposed DSP read channel J.I. Goodman H.F. Hinteregger            
253.1 05AUG97 Timing recovery and gain control for proposed DSP read channel J.I. Goodman H.F. Hinteregger            
254 21JUL97 Timing on Station Unit W.A. Aldrich              
255 04NOV97 SMA Correlator DSP Software A.R. Whitney              
255.1 01JUL98 SMA Correlator DSP Software A.R. Whitney J.I. Goodman            
256 15JAN98 Initial results decoding data from tape recorded at 84Kfci J.I. Goodman              
257.1 04MAY99 Serial Link Cables D.L. Smythe              
258 06JUN98 Haystack Dry Air Kit H.F. Hinteregger D.W. Fields A.E. Niell          
259 072898 Mechanical test and acceptance requirements for thin tape H.F. Hinteregger              
260 111698 Critical Screw Protrusion Check for Headstack Mounting H.F. Hinteregger              
261 111698 Determination of Correct Write Voltage Vc:Introduction H.F. Hinteregger              
262 111898 Spin Physics Heads at 18 Mb/s D.L. Smythe              
263 122298 Wear Tests of the Flat-Top Thin-Film Head by Tape Shuttling S. Muftu              
264 111798 Evaluation of Two Triple-Cap Headstack Variants H.F. Hinteregger              
265 123098 An Introduction to the Mark IV Data Acquisition System for Mark III Users D.L. Smythe              
266 122898 Mark IV DAS Performance Check List D.L. Smythe              
267 122898 Tape recorder performance test Alan E.E. Rogers D.L. Smythe            
268 011399 Progress report on thin-film head development H.F. Hinteregger              
269 020599 Evaluation of Phase-2, Part-1 Heads for the thin-Film MR Head Project:Triple-Flat Assembly Contour Geometry Qualification Tests H.F. Hinteregger S. Muftu            
270 020399 401 Simulation of the Tape-Flat-Head Interface for Phase II, Part 1 of the TF-Project S. Muftu H.F.Hinteregger          
 271     Test of Flat, Thin Film, Magnetoresistive Head Arrays for VLBI Tape Recorders  S. Muftu H.F.Hinteregger            
 272 051299   Tape Drive Manual for Operation in Field and Processor Sites  D.Fields H.F. Hinteregger            
 273 061699 Stepped Head Stacks at 18 Mb/s/track  D.L. Smythe            
 274 090899   Evaluation of Phase-2: Five Supplementary Tests H.F. Hinteregger              
 275 083199   Bulk Degausser Evaluations and Recommendations for VLBI H.F. Hinteregger              
 276 113099   Deformation of a Tape Subject to Uniform Pressure: No-Contact Case for VLBI S. Muftu              
 277 020800   Reading and Writing at 320 IPS with Current Head Stacks D.L. Smythe              
 278 040400   Specification for Mark IV Decoder Module A.R. Whitney  R.J. Cappallo            
 279 111804   Mark IV Decoder Protocol R.J. Cappallo              
 280 071100   Wear testing of an experimental Metrum headstack S. Muftu  H.F.Hinteregger  P.A. Bolis          
 281 103100   Concept for Next Generation VLBI J. Ritakari  H.F.Hinteregger  P.A. Bolis          
 282 021401   8 Mb/s Equalizers D.L. Smythe          
 283 031601   Mark IV Correlator Board Timing W. Aldrich          
 284 071001   280 ips Read-Only Interface, New and Existing Head Usage Recommendations H.F. Hinteregger          
 285 071001   Review of Feb-Aug '00 Notes: High-speed Head and Interface Problems and Fixes H.F. Hinteregger          
 286 101001   Write and Write-Crosstalk Tests of 1/2-inductance Spin-Physics Prototype and Standard Metrum Heads H.F. Hinteregger          
 288 071201   Proposed revision of headstack specifications H.F. Hinteregger A.E. Niell A.R. Whitney          
 290 080601   Evaluation of Capstan Noise for Model 96 Tape Transport T. Buretta          
 291 031303   Recently Discovered Model Problems in the Mark 4 Correlator R. Cappallo          
 292 031103   Optimally Setting the kdiv Parameter in the Mark 4 Correlator R. Cappallo          
 293 101006   Timing Offset of the Mark 4 Formatter D.L. Smythe          
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