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Cross Technologies 450R Operator's Manual

Dual fm subcarrier receiver and transmitter
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Model 450R, 450T
Dual FM Subcarrier
Receiver and Transmitter
Operators Manual
FIRST 8/10/98
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.
ALPHARETTA, GEORGIA 30005
WEB www.crosstechnologies.com
E-MAIL info@crosstechnologies.com
450 Operation Manual Rev A
CROSS TECHNOLOGIES, INC.
6170 SHILOH ROAD
(770) 886-8005
FAX (770) 886-7964
Toll Free 888-900-5588
REV A 8/26/99
Page 1
8/26/99

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  • Page 1 FIRST 8/10/98 REV A 8/26/99 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 450R, 450T Dual FM 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 A D J U S T M E N T S a n d O P T I O N S ......2 2 4-1.

  • 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: G 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 450 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 Audio Interface: Input/Output Frequency range ..... 40 Hz to 15 kHz Peak program level ....+9 or+18 dBm selectable Impedance ......600 or high Z in 600 or low Z out Balanced, transformer coupled Connector type ...... Terminal block Audio Characteristics: (with 3:1 compandor and emphasis) Dynamic range .......
  • Page 9 TABLE 1-1 SPECIFICATIONS (Cont'd.) Power Requirements: Standard.......115/230 VAC (47-63 Hz) Environmental Requirements: Ambient temperature for: Storage ......-20°C to +70°C Specification ....+10°C to +40°C Humidity......95% maximum Altitude: Storage ......12,200 meters(40,260 ft.) ASL Specifications ....3,050 meters(10,000 ft.) ASL Alarms: Front panel visual and Form C contact.

  • Page 10: General Description

    1-4.GENERAL DESCRIPTION. The Model 450 Dual FM Subcarrier System consists of two complete frequency agile FM transmitters or receivers in a single enclosure. A common microprocessor circuit is used to program the operating frequencies of the channels, monitor alarm conditions, and configure some system options.

  • 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, Inc. office immediately. The warranty statement is located in the front of this manual.

  • Page 12: Power Requirements

    2-4. POWER REQUIREMENTS. - The Model 450 requires a power source of 105V-130V 50-60Hz or 210V-250V 50-60Hz. Power consumption is: Transmitter....28 VA maximum. Receiver..... 24 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

    Figure 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 instrument cabinet. 2-7. OPERATING ENVIRONMENT. - The operating environment should be within the following limitations: Temperature......

  • Page 14: Video Baseband Connections

    2-10. VIDEO/BASEBAND CONNECTIONS. - Baseband connections are BNC connectors on the rear of the shelf. A detailed description of the connections are: Transmitter: Input ... Video input from video source. If video is not used this port is terminated with 75 ohms.

  • Page 15: Repackaging

    2-12. REPACKAGING. - If the equipment is to be returned to Cross Technologies, Inc. for any reason, care should be taken in packaging. Call Cross Technologies, Inc. for a Return Material Authorization (RMA) number. Enclose documents detailing reason for return, return address, name and telephone number of contact person.

  • Page 16: 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 both A and B channels are controlled by these components. The functions are: 1.

  • Page 17: Control Switches

    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. 2. Cursor Movement - Horizontal. This switch is mounted so its movement is horizontal and moves the cursor left or right.

  • Page 18: Alarm Indications

    NOTE: The modified frequency and ON/OFF condition will not become effective until the final operation of the Program/Execute switch described in the next paragraph. To prevent interruption of other channels when a frequency change takes place, the 450 automatically mutes the carrier until the phase locked loop frequency synthesizer has stabilized at the new frequency.

  • Page 19: Troubleshooting

    3-6. TROUBLESHOOTING. In the event of difficulty with the 450 Subcarrier System, the following list of possible causes should be reviewed prior to contacting the factory for repair. In the event that factory repair is deemed necessary, please refer to Section 2-12., Repackaging, for information on returning the unit.
  • Page 20 PROBLEM/SYMPTOM POSSIBLE CAUSE Audio sounds noisy. Channel spacing may be too Tones, chirps, buzz, etc close. The 450 requires 280 may also be present. kHz between adjacent channel center frequencies to meet all specifications. At closer spacings some of these symptoms may appear. The subcarrier channel may be co-located with one of the harmonics of a video...
  • Page 21 PROBLEM/SYMPTOM POSSIBLE CAUSE LCD display shows: A checksum error was found after reading the non- NV Memory Error volatile memory device. The unit may still be used (press the Program/Execute switch to proceed) but should be returned for repair as soon as convenient since a power interruption may cause loss of the unit's programmed settings.

  • Page 22: 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 23: 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 450 Transmitter subcarrier level can be adjusted over the range of 25 mV to 100 mV p/p (approx.

  • Page 24: Deviation Adjustment (Dev)

    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. 3. Adjust the second channel of the 450 Transmitter after re-tuning the measuring instrument to the appropriate frequency.
  • Page 25 B. Deviation Adjustment Using a Spectrum Analyzer. 1. If the spectrum analyzer has a high impedance input, connect it to the baseband signal at any convenient point after the insertion of the subcarrier to be adjusted. If the measuring instrument has a low impedance (i.e., 75 or 50 ohm) 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 levels of the signals on the baseband (this level change has no direct effect on the adjustment of...

  • Page 26: Receiver Front Panel Adjustments

    4-6. RECEIVER FRONT PANEL ADJUSTMENTS. NOTE: Prior to setting levels be sure receiver is ON and set to proper frequency. See Section 3. 4-7. Squelch Adjustment. A. Tune the receiver to an 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.

  • Page 27: Audio Adjustment

    4-8. Audio Adjustment. A. Connect a high impedance AC Voltmeter across the T and R terminals for the appropriate channel at the rear of the unit under test. The audio equipment that will normally be connected to these points should remain connected while performing this measurement. B.
  • Page 28 AUDIO - ALM P2 P5 IMPED EMPH EMPH IMPED Figure 4-1 Transmitter Jumper Block Locations. 450 Operation Manual Rev A Page 28 8/26/99...

  • Page 29: Audio Input Level

    4-10. Transmitter Audio Input Level. - The audio input level selection is made on jumper block P3 for the "A" channel, and on P5 for the "B" channel. The jumper positions (looking from the front of the unit) are: P3 or P5 P3 or P5 +18 dBm PPL +9 dBm PPL...

  • Page 30: Receiver Internal Options

    4-13. RECEIVER INTERNAL OPTIONS. - The internal options are selected with jumper plugs on the internal printed circuit board, and require removal of the top cover plate of the units. ___________ _ WARNING _ ___________ Unplug the power cord from the equipment before removing any cover plates.
  • Page 31 AUDIO - ALM EMPH EMPH VID HPF Figure 4-1 Receiver Jumper Block Locations. 450 Operation Manual Rev A Page 31 8/26/99...

  • Page 32: Emphasis Type (With Expander Out)

    4-15. Receiver Emphasis Type. - The emphasis type selection controls the de-emphasis used only when the expander is switched out. The expander includes its own emphasis system that cannot be modified. Emphasis selection for the "A" channel is made with jumper block P4, and for the "B"...

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450t

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