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