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Cross Technologies 455R Operator's Manual

Composite mts/btsc subcarrier receiver and transmitter
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Model 455R, 455T
Composite MTS/BTSC
Subcarrier Receiver and
Transmitter
Operators Manual
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
FAX (770) 886-7964
WEB www.crosstechnologies.com
E-MAIL info@crosstechnologies.com
(770) 886-8005
Rev 2.2 6/25/98

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  • Page 1 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.

  • Page 2: Table Of Contents

    Model 455R, 455T Composite MTS/BTSC Subcarrier Receiver and Transmitter Operators Manual TABLE of CONTENTS SECTION TITLE PAGE W a r r a n t y ............4 OPERATORS SAFETY CONSIDERATIONS....5...

  • Page 3: Section Title Page

    TABLE of CONTENTS SECTION TITLE PAGE O P E R A T I O N ..........1 8 3-1.

  • Page 4: Warranty

    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.

  • Page 5: Operators Safety Considerations

    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...
  • Page 6 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.

  • Page 7: E N E R A L I N F O R M A T I O N

    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.
  • Page 8 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;...
  • Page 9 TABLE 1-1 - SPECIFICATIONS (Cont'd.) Subcarrier output level....75 to 300 mV P/P (adj.) Output impedance......Bridging (≥3 kΩ) to 75Ω line 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...

  • Page 10: General Description

    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.

  • Page 11: Introduction

    Keep the shipping material for the carrier's inspection. In the event of mechanical damage, or if the equipment does not pass electrical performance tests, notify the Cross Technologies office immediately. The warranty statement is located in the front of this manual.

  • Page 12: Power Requirements

    2-4. Power Requirements. The Model 455 requires a power source of 105V-130V 50-60Hz or 210V-250V 50-60Hz. Power consumption is: Transmitter....24 VA maximum. Receiver..... 20 VA maximum. 2-5. Line Voltage Selection. CAUTION Before connecting ac power to this equipment, make sure it is set to the line voltage of the power source.

  • Page 13: Power Cable

    Fig. 2.1 AC Connector 2-6. Power Cable. In accordance with safety standards, this equipment is supplied with a three conductor cable. When connected to an appropriate power line outlet, this cable grounds the equipment cabinet. 2-7. OPERATING ENVIRONMENT. The operating environment should be within the following limitations: Temperature......

  • Page 14: Remote Control Interface Information

    BTSC BASE BAND BTSC COMPOSITE LOOP THRU COMPOSITE STEREO MONITOR INPUT OUTPUT IN (XMT) OUT (RCV) I NPUTS FIGURE 2-2 455 Rear Panel 2-10. Remote Control Interface Information. The 455 remote control input is capable of switching the unit to an alternate configuration which the user has pre-programmed (see Section 3-4 for set-up information).

  • Page 15: Composite/Stereo/Sap/Pro/Monitor Connections

    75Ω. In multiple- unit operation, the input of units after the first is connected to the output of the preceding unit. Output - Composite output to microwave or satellite transmitter. In multiple unit operation, the output of all but the last unit connects to the input of subsequent units. Receiver: Input - Composite input from microwave or satellite receiver.

  • Page 16: Video Filtering

    Composite Monitor - This output connector provides a monitor point for the combined modulation signal resulting from the various input signals. The output impedance is 75Ω and should be terminated with 75Ω when measurements are being made. BTSC BASE BAND BTSC COMPOSITE LOOP THRU...

  • Page 17: Repackaging

    2-14. REPACKAGING. If the equipment is to be returned to Cross Technologies for any reason, care should be taken in packaging. Call Cross Technologies for a Return Material Authorization (RMA) number. Enclose documents detailing reason for return, return address, name and telephone number of contact person.

  • Page 18: Introduction

    Section 3 - OPERATION 3-1. INTRODUCTION. This section describes operation of the front panel controls. There are three operator switches, the LCD display and an alarm indicator. All functions for the equipment are controlled by these components. The functions are: 1.Turn the channel "on"...

  • Page 19: Control Switches

    3.The software version will be displayed. __________________ _Software Rev #.#_ __________________ 4.The present status of the channel is shown. The unit is now operational and ready for any changes the operator may desire. 3-3. CONTROL SWITCHES. 1.Program/Execute. Any change to the programming of the unit must be initiated by pressing the Program/Execute switch and completed by pressing the Program/Execute switch.
  • Page 20 Pressing the Up/Down switch (in either direction) will toggle the display to: __________________ _MODIFY REMOTE _ __________________ When the display indicates the configuration (local or remote) to be modified, press the Program/Execute switch. 2.Status of the selected configuration will be displayed. For example: __________________ _L 6.60MHz ON _ __________________...

  • Page 21: Alarm Indications

    4.Operate the Program/Execute switch. The display will now show the deviation setting (WIDE/NARROW): __________________ __________________ _WIDE DEVIATION _ or _NARROW DEVIATION_ __________________ __________________ If you wish to make a change, operate the vertical switch to toggle the status. When the display indicates the desired condition, press the Program/Execute switch a final time.

  • Page 22: Troubleshooting

    Receiver: CXR ALM upon a drop in incoming carrier level beyond the squelch setting or the RF/IF section of the receiver is defective. AFC ALM if the incoming carrier is off frequency or if the frequency determining elements of the receiver are defective. CXR AFC if both alarms are present.
  • Page 23 Audio is noisy, but Transmission path noise may sounds normal in other be excessive. Check other respects. system components, RF power, and antenna pointing. In non-video systems, if the subcarrier frequency is less than about 4.5MHz, the high pass filter in the receiver may not be set OUT.
  • Page 24 Composite level and/or Verify correct equipment carrier deviation too impedances and terminations. high or low. LCD display blank. Loss of power. Possible causes include blown fuse, incorrect line voltage selection, etc. (See Section 2-5.) LCD display shows: A checksum error was found after reading the non- NV Memory Error volatile memory device.
  • Page 25 Receiver LCD display Any of the situations de- indicates an AFC alarm. scribed above for a CXR alarm may, under some con- ditions, also cause an AFC alarm. The receiver may be tuned to a wide deviation channel which it is unable to track. LCD display is garbled Ribbon cable connecting or inconsistent with...

  • Page 26: Introduction

    Section 4 - ADJUSTMENTS and OPTIONS 4-1. INTRODUCTION. This section describes operator adjustments and the selection of the internal options. For a discussion of the microprocessor-controlled functions (Channel ON/OFF, FREQUENCY and compandor IN/OUT) please refer to Section 3-4. For a discussion of line voltage selection, please refer to Section 2-5.

  • Page 27: Transmitter Front Panel Adjustments

    4-3. TRANSMITTER FRONT PANEL ADJUSTMENTS. NOTE:Prior to setting levels be sure transmitter is ON and set to proper frequency. See Section 3. 4-4. Level Adjustment (IF). Determine the desired subcarrier level for your specific system. The 455 Transmitter subcarrier level can be adjusted over the range of 75 mV to 300 mV p/p (approx. -8 TO -20 dB, 75Ω). A.

  • Page 28: Deviation Adjustment (Dev)

    measuring instrument has a low impedance (i.e., 75Ω or 50Ω) it is necessary to connect the instrument to an isolated monitor point in order to prevent the additional load presented by the low impedance input from affecting the level to be measured. 2.With the measuring instrument properly tuned to the frequency of the channel to be adjusted, set the IF (subcarrier level) screwdriver adjustment on the front panel for the proper level for your system.
  • Page 29 The front panel DEV adjustment is provided to compensate for minor variations in incoming composite signal strength, and is not intended to provide for operation at deviations other than the 455's specified deviation. The deviation may be accurately set using either a modulation meter or a spectrum analyzer;...

  • Page 30: Use Of The Overmodulation Indicator

    generator to provide a 10.396 kHz test signal at a 100% modulation level at both inputs. The pilot should be switched off for this procedure, and the SAP and PRO channels should also be OFF. 3.Temporarily disconnect the audio signal generator. Tune the spectrum analyzer to the frequency of the 455 subcarrier.

  • Page 31: Squelch Adjustment

    4-8. Squelch Adjustment. A.Tune the receiver to a compatible active channel. Presence of an Alarm indication and a CXR ALM display may indicate one or more of the following conditions: 1) No carrier is being received. 2) Squelch adjusted improperly. 3) The carrier receiver is malfunctioning.

  • Page 32: Composite Level Adjustment

    4-9. Composite Level Adjustment. A.Connect a high impedance AC Voltmeter across the BTSC Composite Out line. The audio equipment that will normally be connected to this line should remain connected while performing this measurement; if for any reason the level must be set in the absence of the connecting equipment, terminate the line with a precision 75Ω...

  • Page 33: Input Highpass Filter

    4-12. Input Highpass Filter. The 455 Receiver input circuitry includes a highpass filter that is designed to prevent high level video signals at the bottom of the baseband from overloading sensitive sections of the receiver. In applications where video is present on the baseband, this filter should always be strapped IN. In applications without video, where the entire baseband is dedicated to subcarriers, the filter should be jumpered in the OUT position.

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