Cross Technologies 455R Manual de usuario
Model 455R, 455T
Composite MTS/BTSC
Subcarrier Receiver and
Transmitter
Operators Manual
Rev 2.2 6/25/98
Data, drawings, and other material contained herein are
proprietary to Cross Technologies, Inc., and may not be
reproduced or duplicated in any form without the prior
permission of Cross Technologies, Inc.
When ordering parts from Cross Technologies, Inc., be sure
to include the equipment model number, equipment serial
number, and a description of the part.
CROSS TECHNOLOGIES, INC.
6170 SHILOH ROAD
ALPHARETTA, GEORGIA 30005
(770) 886-8005
FAX (770) 886-7964
WEB www.crosstechnologies.com
E-MAIL [email protected]
Model 455R, 455T Composite MTS/BTSC Subcarrier Receiver and
Transmitter Operators Manual
TABLE of CONTENTS
SECTION TITLE PAGE
Warranty........................................................4
OPERATORS SAFETY CONSIDERATIONS................5
1 GENERAL INFORMATION ................................. 7
1-1. INTRODUCTION ........................................................... 7
1-2. SPECIFICATIONS .......................................................... 7
1-3. SAFETY CONSIDERATIONS ............................................ 7
1-4. GENERAL DESCRIPTION ................................................ 10
2 INSTALLATION ............................................ 11
2-1. INTRODUCTION ........................................................... 11
2-2. INITIAL INSPECTION .................................................... 11
2-3. PREPARATION FOR USE ................................................ 11
2-4. Power Requirements ..................................................... 12
2-5. Line Voltage Selection ................................................... 12
2-6. Power Cable ............................................................... 13
2-7. OPERATING ENVIRONMENT ........................................... 13
2-8. RACK MOUNTING ........................................................ 13
2-9. REMOTE & ALARM CONNECTIONS .................................. 13
2-10. Remote Control Interface Information ................................ 14
2-11. VIDEO BASEBAND CONNECTIONS ................................. 14
2-12. COMPOSITE/STEREO/SAP/PRO/MONITOR CONNECTIONS.... 15
2-13. VIDEO FILTERING ....................................................... 16
2-14. REPACKAGING ........................................................... 17
455 Operation Manual Page 2 6/23/98
TABLE of CONTENTS
SECTION TITLE PAGE
3 OPERATION ................................................ 18
3-1. INTRODUCTION ........................................................... 18
3-2. APPLYING POWER ........................................................ 18
3-3. CONTROL SWITCHES .................................................... 19
3-4. STATUS CHANGES ....................................................... 19
3-5. ALARM INDICATIONS ................................................... 21
3-6. TROUBLESHOOTING .................................................... 22
4 ADJUSTMENTS and OPTIONS ........................... 26
4-1. INTRODUCTION ........................................................... 26
4-2. RECOMMENDED TEST EQUIPMENT ................................. 26
4-3. TRANSMITTER FRONT PANEL ADJUSTMENTS .................. 27
4-4. Level Adjustment (IF) ................................................... 27
4-5. Deviation Adjustment (DEV) ........................................... 28
4-6. Use of the Overmodulation Indicator .................................. 30
4-7. RECEIVER FRONT PANEL ADJUSTMENTS ........................ 30
4-8. Squelch Adjustment ...................................................... 31
4-9. Composite Level Adjustment ........................................... 32
4-10. TRANSMITTER INTERNAL OPTIONS ............................... 32
4-11. RECEIVER INTERNAL OPTIONS ..................................... 32
4-12. Input High Pass Filter .................................................. 33
455 Operation Manual Page 3 6/23/98
WARRANTY
This Cross Technologies product is warranted against defects in material and workmanship for one
year from the date of shipment. During this period Cross Technologies will either repair or
replace, at its option, products which prove to be defective.
To obtain service under this warranty, this product must be returned to Cross Technologies at its
address. Buyer shall pay all shipping charges to Cross Technologies, and Cross Technologies
shall pay all charges for return shipment to buyer. When this product is to be returned from
outside the United States, buyer shall pay all shipping charges, taxes, duties or other reasonable or
necessary costs to transport the product safely in both directions.
LIMITATIONS AND EXCLUSIONS
This warranty shall not apply to defects resulting directly or indirectly from any of the following:
Improper or inadequate maintenance.
User-supplied interfacing or connected equipment.
Operation beyond the specifications of the unit or under severe
environmental conditions.
Improper facility preparation or maintenance.
No other warranty is expressed or implied. Cross Technologies specifically
disclaims any implied warranties of merchantability or fitness for any particular
purpose. Under no circumstances shall Cross Technologies be liable for any
incidental, indirect or consequential damages or losses, whether or not Cross
Technologies has any advance notice of the possibility of such damages.
Correspondence: CROSS TECHNOLOGIES, INC.
6170 Shiloh Road, Alpharetta, GA 30005
FAX (770) 886-7964
455 Operation Manual Page 4 6/23/98
OPERATORS SAFETY CONSIDERATIONS
General
The general safety information in this documentation is for operating and servicing personnel.
Specific warnings and cautions will be found throughout the manual where they apply and may or
may not appear here.
Safety Symbols ___________
_ WARNING _
___________
WARNING symbols indicate a condition, practice or procedure that, if not properly performed or
adhered to, could result in personal injury or loss of life.
CAUTION
CAUTION symbols indicate a condition, practice or procedure that, if not properly performed or
adhered to, could result in damage to the equipment or other property.
Before Applying Power
CAUTION
Verify that the voltage selection on the power receptacle matches the line voltage and the proper
fuse is installed. See Section 2. ___________
_ WARNING _
___________
This equipment is grounded through the grounding
conductor of the power cord supplied with the unit. To
avoid electrical shock, plug the power cord into a properly
wired receptacle. An uninterruptible safety earth ground
must be provided from the main power source to the
equipment via the power cord. Grounding one conductor of
a two conductor wiring system or cord is not sufficient
protection.
455 Operation Manual Page 5 6/23/98
OPERATORS SAFETY CONSIDERATIONS
(Cont'd.)
___________
_ WARNING _
___________
Danger From Loss of Protective Ground
Upon loss of the protective ground connection, all accessible
conductive parts can render an electrical shock.
Do Not Remove Covers or Panels
To avoid personal injury or shock, equipment should not be
operated without covers or panels.
Servicing
Servicing instructions are for the use of qualified servicing
personnel only. Some adjustments described in this manual
are performed with power applied to the equipment and the
cover removed. To avoid dangerous shock, only qualified
service personnel should perform maintenance.
LCD Display Module
The LCD Display Module mounted in the front panel is
fragile. Care should be taken not to break the exposed glass
panel. If broken, extreme caution should be used to avoid
cuts from sharp edges. If the liquid crystal material touches
your skin or clothes, wash it off immediately using soap and
plenty of water. Do not allow any of the liquid crystal
material to get in your mouth.
455 Operation Manual Page 6 6/23/98
Section 1 - GENERAL INFORMATION
1-1. INTRODUCTION.
This manual contains information necessary for the installation, operation, testing and alignment
of the Model 455 FM Subcarrier. The documentation for this product is divided into five sections
as described below.
Section 1.General Information: provides general information about this equipment, circuit
description and specifications.
Section 2.Installation: provides installation information including initial inspection, installation
and repackaging the equipment.
Section 3.Operation: provides information about front panel checks and settings.
Section 4.Adjustment & Options: provides information to adjust the equipment, and to select
the various options.
1-2. SPECIFICATIONS.
The specifications are listed in Table 1-1. These are performance standards to which the
Model 455 is aligned and tested.
1-3. SAFETY CONSIDERATIONS.
Safety information, relating to installation, testing, etc. is found throughout this manual. Please
refer toOPERATORS SAFETY CONSIDERATIONS at the beginning of this manu
DEV I F
A B
PROGRAM
EXECUTE ALARM
CROSS TECHNOLOGIES INC.
SQUELCH AUDIO
A B
PROGRAM
EXECUTE ALARM
CROSS TECHNOLOGIES INC.
FIGURE 1-1 Model 455 Subcarrier Transmitter and Receiver
455 Operation Manual Page 7 6/23/98
TABLE 1-1 - SPECIFICATIONS
System Characteristics:
Subcarrier frequency range......Frequency agile from 1.0 MHz to 9.99 MHz in 10 kHz steps
Frequency response..............±0.1 dB from 20Hz to 70kHz; ±0.5 dB from 70kHz to 120kHz
Total harmonic distortion..........<0.05% at 1 kHz (De-emphasized, 30kHz bandwidth)
Long term stability (6 months)....±0.1 dB at 25°C; ±0.25 dB, 0-50°C
Channel spacing (minimum).......280 kHz for narrow deviation; 600 kHz for wide deviation
Remote control input...............User selectable for on/off or alternate frequency selection
Power requirement.................115/230 VAC (47-63 Hz) <20 VA
Storage temperature range..........-40°C to +70°C
Operating temperature range........0°C to +51°C
Mechanical dimensions............44.4mm (1.75")H x 483mm (19")W x 381mm (15")D, each
Modulator Characteristics:
Nominal deviation for 1V rms (2.828V p-p) inputs:
Input Deviation Setting
Wide Narrow
Composite.............................±150.0kHz ±73kHz
Stereo..................................±113.0kHz ±55kHz
SAP......................................±30.8kHz ±15kHz
Pro.........................................±6.2kHz ±3kHz
455 Operation Manual Page 8 6/23/98
TABLE 1-1 - SPECIFICATIONS (Cont'd.)
Subcarrier output level.................75 to 300 mV P/P (adj.)
Output impedance......................Bridging (≥3 kΩ) to 75Ωline
Front panel adjustments/settings.............Deviation
Subcarrier Level
Subcarrier Frequency
Deviation Range Wide/Narrow
Channel On/Off
Remote Control Mode / Alternate Frequency
Front panel visual indications................Subcarrier Frequency
Alarm and On/Off Status
Overmodulation
Remote Active
Connector type.......................(7) BNC Female plus
5 position modular terminal strip for remote and alarms
Demodulator Characteristics
Composite output level............1.0 V rms for ±150 kHz deviation (wide)
or ±73 kHz deviation (narrow)
Subcarrier input level...............1 mV to 500 mV P/P
Input impedance.................Bridging (≥4 kΩ) to 75Ωline
Front panel adjustments/settings.............Squelch Level
Composite Output Level
Subcarrier Frequency
Channel On/Off
Remote Control Mode / Alternate Frequency
Front panel visual indications.................Subcarrier Frequency
Alarm and On/Off Status
Remote Active
Connector type......................(3) BNC Female plus
5 position modular terminal strip for remote and alarms
455 Operation Manual Page 9 6/23/98
1-4. GENERAL DESCRIPTION.
The 455 Composite Subcarrier System is engineered to provide a transparent path for the
complete MTS/BTSC composite signal over any video microwave system. With its extremely
low distortion (less than 0.05% at 1kHz), flat frequency response from 20Hz to 120kHz, and
outstanding long-term stability, the 455 has almost no measurable effect on stereo audio
performance.
Both the modulator and the demodulator are fully frequency synthesized and microprocessor
controlled for ease of operation and the ultimate in versatility. All of the critical operating
parameters, as well as any alarm conditions, are displayed on the front panel LCD. Any operating
frequency from 1 MHz to 9.99 MHz can be selected from the front panel. Also selected from
the front panel is a choice of "wide" or "narrow" deviation settings. The wide setting is used to
provide optimum signal-to-noise performance for STL applications, while the narrow setting
provides BTSC broadcast standard compatibility which (with the unit set to 4.50 MHz) can be
used for direct feeds to cable systems or low power transmitter facilities. In spite of this
convenient user interface, a number of safeguards make it nearly impossible to change the
settings of the unit by accident. A built in non-volatile memory device retains the most recent
configuration of the unit during temporary power outages or even prolonged storage without
power.
A remote control input is provided which can be used to either turn the channel on or off, or to
switch the operating frequency. This feature is extremely useful for redundant or backup system
configurations, and, like all of the 455's features, can be easily configured from the front
panel.
The 455 demodulator incorporates Tectan's patented threshold extension FM detector. This
unique circuit permits the 455 to flawlessly track the incoming FM signal under severe noise
conditions which render other receivers useless. This detector design is also inherently stable
with respect to both amplitude and phase, without resorting to complicated automatic modulation
control circuits.
The video baseband is combined with the subcarrier signals in the transmitter by a low component
count passive directional coupler. This circuit has been designed to put virtually no load on the
video line (≥3 KΩ), allowing multiple units to be "daisy-chained" without adversely affecting the
signals on the baseband. The low component count and passive nature of this circuit provide
excellent protection against disruption of the baseband due to component failure or loss of power
in the 455.
455 Operation Manual Page 10 6/23/98
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