Tektronix VITS 200 User manual

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Instruction Manual
VITS 200
NTSC VITS Inserter
070-8332-04
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

Copyright ©Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If a product proves defective during this
warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor,
or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time
or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Contacting Tektronix
Product
Support For application-oriented questions about a Tektronix measure- ment product, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
[email protected]
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Service
Support Contact your local Tektronix distributor or sales office. Or visit our web site for a listing of worldwide service locations.
www.tektronix.com
For other
information In North America: 1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
To write us Tektronix, Inc.
P.O. Box 1000
Wilsonville, OR 97070-1000

VITS 200 i
Table of Contents
List of Figures ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
Getting Started 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Operating Basics 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video Clapboard 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232 Control 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel 2–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Specifications 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Theory of Operation 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Signal Generation 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Genlock 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Inputs 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal and Switching Control 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Character and Source ID Generation 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel, Remote Controls, and Controller 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Overview 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Detailed Description 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Performance Verification 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Equipment List 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Data Report 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verification Procedure 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
Adjustment Procedures 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Equipment List 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ii VITS 200
Calibration Procedure 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Maintenance 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Aids 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Corrective Maintenance 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Selectable Parts 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts List
Replaceable Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematics
Schematics/Circuit Board Illustrations 9–1. . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Mechanical Parts List
Replaceable Mechanical Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index
List of Figures
Figure 1–2: Rail Detail for Mounting Slide Tracks 1–8. . . . . . . . . . . . . . .
Figure 1–3:Assembly of Rack Mounting Hardware 1–9. . . . . . . . . . . . . .
Figure 1–4: Mounting Stationary Track Sections (Front Rail Mount) 1–10
Figure 1–5: Mounting Stationary Track Sections (Deep Rack Mount) 1–10
Figure 1–6: Mounting Stationary Track
Sections (Shallow Rack Mount) 1–11. . . . . . . . . . . . . . . . . . . . . . .
Figure 1–7: Racking and Unracking the VITS 200 1–12. . . . . . . . . . . . . . .
Figure 2–1: VITS 200 Front Panel 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: VITS 200 Menu Structure 2–5. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Remote Control Connector 2–17. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: Video Clapboard Connections 2–21. . . . . . . . . . . . . . . . . . . . . .
Figure 2–5: Controlling the VITS 200 with a VM700A. 2–22. . . . . . . . . . .
Figure 2–6: VITS 200 Rear Panel. 2–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: 0% Black 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–2: 7.5% Black 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–3: 10 MHz Sweep 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
VITS 200 iii
Figure 3–4: NTC7 Combination 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–5: FCC Composite 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–6: NTC7 Composite 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–7: FCC Multiburst 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–8: 50% Gray 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–9: SIN X/X 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–10: FCC Color Bars 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–11: Multipulse 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–12: VIRS 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–13: Red Field 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–14: BTA Ghost Canceller Reference 3–12. . . . . . . . . . . . . . . . . . .
Figure 3–15: Phillips GCR Positive 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–16: Phillips GCR Negative 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–17: Korean GCR Positive 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–18: Korean GCR Negative 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–19: Cable Multiburst 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–20: Cable Sweep 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: Remote Control Connector Pinout. 4–10. . . . . . . . . . . . . . . . . .
Figure 4–2: Basic Operation of T1 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–1: VM700A Horizontal Timing Measurement Display 5–21. . . .
Figure 7–1: Using the Foldout Pages 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–2: Circuit Board Assembly Locations. 7–3. . . . . . . . . . . . . . . . .
List of Tables
Table 1–1: Inserter Board (A1) Operating Mode
Selection Jumpers (Green) 1–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Controller Board (A3) Operating Mode
Selection Jumpers (Green) 1–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: Inserter Board (A1) Test Jumpers (Red) 1–6. . . . . . . . . . . . . .
Table 1–4: Controller Board (A3) Test Jumpers (Red) 1–7. . . . . . . . . . . .
Table 2–1: Character List for the VITS 200 2–10. . . . . . . . . . . . . . . . . . . .
Table 2–2: Factory VITS assignments for Std and Opt 1C 2–14. . . . . . . .
Table 2–3: Factory VITS assignments for Opt 1J 2–14. . . . . . . . . . . . . . . .

Contents
iv VITS 200
Table 2–4: Binary Standby Message Select 2–19. . . . . . . . . . . . . . . . . . . . .
Table 2–5: Binary VBI Message Select 2–20. . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–6: RS-232 Connector Pin Functions – 25-Pin Serial Ports 2–24. .
Table 2–7: 9-Pin to 25-Pin Adaptor Connections for RS-232 2–24. . . . . .
Table 2–8: SCPI Commands (4.1.1 and 4.2.1) 2–32. . . . . . . . . . . . . . . . . . .
Table 2–9: Defined RS-232 Commands for use with the VITS 200 2–33. .
Table 2–10: RS-232 Mnemonics 2–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–1: Program Channel 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–2: External Inputs 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–3: Test Signal and Black Burst General Characteristics 3–3. . .
Table 3–4: Test Signal Characteristics 3–4. . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–5: Genlock Characteristics 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–6: Power Supply Characteristics 3–16. . . . . . . . . . . . . . . . . . . . . .
Table 3–7: Physical Characteristics 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–8: Environmental Characteristics 3–18. . . . . . . . . . . . . . . . . . . . . .
Table 3–9: Certifications and compliances 3–18. . . . . . . . . . . . . . . . . . . . . .
Table 6–1: Power Supply Characteristics 6–3. . . . . . . . . . . . . . . . . . . . . .
Table 7–1: Inserter Board Diagnostics 7–5. . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–2: Torque Specifications 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7–3: Test Selectable Parts 7–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VITS 200 v
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or
laser radiation exists.
Do Not Operate With SuspectedFailures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/DampConditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
To Avoid Fire or
Personal Injury

General Safety Summary
vi VITS 200
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual WARNING High Voltage Double
Insulated ProtectiveGround
(Earth) Terminal Not suitable for
connectionto
thepublic telecom-
municationsnetwork
Symbols and Terms

VITS 200 vii
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, switch off the instrument power, then
disconnect the power cord from the mains power.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.

Service Safety Summary
viii VITS 200

Getting Started

VITS 200 1–1
Getting Started
Product Description
The TEKTRONIX VITS 200 NTSC VITS INSERTER is a high quality signal
generator designed for VITS and data insertion into the program signal. It
provides three different modes of standby operation in the event of program line
failure. The VITS 200 provides a complement of digitally generated test signals,
all of which may be inserted as VITS. There is a one-line source identification
code (recognizable by the VM700A) which may also be inserted in the vertical
interval. There are also four external inputs which will accept other signals or
data to insert in the vertical interval.
The VITS 200 also provides internally-generated text. Up to 15 one-line
messages may be programmed into memory, for insertion into the vertical
interval, and three pages of standby messages can be programmed into memory
for use in standby operation. Control of both the vertical interval text and
standby text is provided through the remote control, as well as the front panel.
All of the operating mode, VITS assignment, and text selections are stored in
nonvolatile memory in case of power line failure.
The VITS 200 uses 12-bit data at an 8 FSC data rate to ensure accurate test signal
generation. These test signals may be used as VIT signals, and may be
programmed to be output as the full field signal if the Program Input should fail.
The test signals are also available at the TEST SIGNAL output on the rear panel.
The signal available at this output may be selected independently of the VIT or
Program Failure signals, except when the VITS 200 is in Standby mode
operation. It then reverts to the selected standby signal. The test signals
generated by the VITS 200 include:
H10 MHz Sweep
HNTC7 Combination
HNTC7 Composite
HFCC Multiburst
H50% Gray
HSIN X/ X
HFCC Color Bars
HFCC Composite
HMultipulse
Test Signal Generator

Getting Started
1–2 VITS 200
HVertical Interval Reference Signal (VIRS)
HRed Field
H0 IRE Flat Field (0% Black)
H7.5% Black
For instruments with S/N B020249 and above:
HFCC Composite 20 IRE (Std, Opt 1C only)
HCBC Composite 15°–360°(Opt 1C only)
HBTA Ghost Cancellation Reference (Opt 1J)
HPhillips Ghost Cancellation Reference (Std and Opt 1C)
When called as a full field test signal, only the GCR Positive will be used.
HKorean Ghost Cancellation Reference (Opt 1K)
The VITS 200 may be programmed to insert any internally-generated signal,
external input, or the source identification. These may be inserted on lines 10
through 23 or on lines 17 through 30. VITS can be programmed on even and
odd fields or in a four-field sequence. The VITS 200 may be genlocked to either
the Program signal or the EXTERNAL 1 input. If you like, you can program the
same signal or external input to be inserted on more than one line. This may be
useful in insertion of external data signals, such as Teletext.
Four external inputs are provided for inserting externally-generated test and data
signals. These inputs may be either AC-coupled and clamped, or DC-coupled.
See the Operating Basics section for details of how to change the external input
coupling. The VITS 200 confirms that the inputs are synchronous with the
program signal before allowing it to be inserted in the vertical interval.
When the AUTO VIRS function is selected, the VITS 200 will check the
specified line(s) and field(s) for a VIRS signal on the incoming Program Video.
If VIRS is detected as being present in the proper location, the signal is passed
with no processing. However, if VIRS is not detected on the specified line(s)
and field(s), then the internally-generated VIRS signal will be inserted on them.
The AUTO CAPT function sets the VITS 200 to examine specified line(s) and
field(s) for close-captioned text. This consists of checking the specified line(s)
and field(s) of the incoming program video for any activity greater than 285 mV.
If there is activity above this level, it is passed with no processing. If there is no
activity at this level, then the selected External Input is inserted onto the line.
For example, Auto Capt 1 would insert the signal applied to the EXT 1 input
onto the specified line(s) and field(s) as close-captioned text.
Insert/Delete Functions
Automatic VIRS Detection
Automatic Closed
Captioning Detection

Getting Started
VITS 200 1–3
Maintaining program channel continuity is one of the main considerations in the
VITS 200. Depending on its programming, the VITS 200 provides agile
response to different types of signal or equipment failure. Bypass mode switches
the PROGRAM INput to the PROGRAM OUTPUT, with a delay built into the
path so it matches the Program Channel path. Standby mode allows a page of
text, an internal signal, or an external signal to be applied to the PROGRAM
OUTPUT.
If the power to the VITS 200 fails, the VITS 200 switches to Bypass mode
immediately. The VITS 200 may be programmed to attempt to genlock to the
EXTERNAL 1 input if no video is present at the PROGRAM INput. If video is
present but the VITS 200 cannot genlock to it (non-timebase corrected video, for
example), then the program is passed with no VITS inserted. If there is no video
present, the VITS 200 may be programmed to provide any of the following
responses after a user-adjustable delay:
HSwitch to Relay Bypass (Standby disabled).
HPass the Program channel (no relay bypass).
HSwitch to one of the four external inputs.
HSwitch to an internally-generated test signal, with or without a full page
standby message.
The VITS 200 passes program video through as soon as it is present, and begins
insertion of VITS as soon as it is genlocked.
The VITS 200 can also insert reconstructed sync and burst into the program
signal, in order to ensure the proper amplitude relationships between the inserted
VITS and sync & burst. This does not affect active video to blanking interval
timing. If the program signal is monochrome, the VITS 200 will insert
regenerated sync only.
The VITS 200 includes a text generator which produces a complete set of
alphabetical and numerical characters, along with a selection of special symbols.
Each character is a 32x32 pixel array.
As many as 15 one-line text messages can be programmed into memory. Any
one of these messages may be inserted on lines 10 through 16, or the VITS 200
can be programmed to scroll through any consecutive series of these 15
messages. Test signals or External inputs can also be programmed on lines 10
through 16, and these always take priority over characters.
Up to three full pages of text may be programmed into memory. A page is
defined as a maximum of 13 20-character lines. Any one of the three pages may
be selected if a test signal is chosen as the Standby mode.
Program Channel
Text Generator