Model 450R, 450T Dual FM Subcarrier Receiver and Transmitter Operators Manual 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. CROSS TECHNOLOGIES, INC.
Model 450R, 450T Dual FM Subcarrier Receiver and Transmitter Operators Manual TABLE of CONTENTS SECTION TITLE PAGE Warranty........................................................4 OPERATORS SAFETY CONSIDERATIONS................5 1 1-1. 1-2. 1-3. 1-4. GENERAL INFORMATION ................................. 7 INTRODUCTION ........................................................... 7 SPECIFICATIONS .......................................................... 7 SAFETY CONSIDERATIONS ...........................
TABLE of CONTENTS SECTION 4 TITLE PAGE ADJUSTMENTS and OPTIONS ........................... 22 4-1. INTRODUCTION ........................................................... 22 4-2. RECOMMENDED TEST EQUIPMENT ................................. 22 4-3. TRANSMITTER FRONT PANEL ADJUSTMENTS .................. 23 4-4. Level Adjustment (IF) ................................................... 23 4-5. Deviation Adjustment (DEV) ........................................... 24 4-6. RECEIVER FRONT PANEL ADJUSTMENTS ...
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.
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.
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.
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. Section 2.
TABLE 1-1 SPECIFICATIONS Audio Interface: Input/Output Frequency range ..................... 40 Hz to 15 kHz Peak program level ................. +9 or+18 dBm selectable Impedance ............................ 600Ω or high Z in 600Ω or low Z out Balanced, transformer coupled Connector type ...................... Terminal block Audio Characteristics: (with 3:1 compandor and emphasis) Dynamic range ....................... >90 dB Frequency response ................ ±0.
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.
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. The microprocessor circuit incorporates a non-volatile memory device that retains the most recent settings indefinitely during power outages or prolonged storage.
Section 2 INSTALLATION 2-1. INTRODUCTION. - This section contains instructions for installing and interfacing the Model 450 Dual FM Subcarrier. Included are initial inspection procedures, power and grounding requirements, line voltage selection, interface connections and instructions for repackaging the equipment. 2-2. INITIAL INSPECTION. ___________ _ WARNING _ ___________ In the event that any portion of the outer enclosure of the unit has been damaged, a hazardous electrical shock condition may exist.
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. Also ensure that the common connection of the power outlet is connected to a protective earth contact.
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........................ +10 °C to +40 °C Humidity........................... 95% maximum Altitude........................... 3050 meters(10,000 ft.) ASL 2-8.
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. 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.
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. Original Packaging. It is preferable to use the original packaging if it was retained. Use care in packing, sealing and marking the container. Other Packaging.
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. Turn either channel "on" or "off". 2. Set frequency of either channel. 3. Activate or deactivate the compressor/expander. Alarm indications appear on the LCD display but are not controlled by the operator.
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. It is also used to select the "A"(left) or "B"(right) channel at the beginning of programming. 3. Vertical Switch.
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. 5. Operate the Program/Execute switch. The display will now show the Compressor or Expander status (IN/OUT).
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. PROBLEM/SYMPTOM POSSIBLE CAUSE Audio sound quality not acceptable. Symptoms could include one or more of the following: If Compressor/Expander are being used, both ends must be set IN.
PROBLEM/SYMPTOM Audio sounds noisy. Tones, chirps, buzz, etc may also be present. POSSIBLE CAUSE Channel spacing may be too close. The 450 requires 280 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 signal component (e.g., colorburst). Shift subcarrier frequencies and reevaluate.
PROBLEM/SYMPTOM LCD display shows: NV Memory Error Receiver LCD display indicates a CXR alarm. POSSIBLE CAUSE A checksum error was found after reading the nonvolatile 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. Receiver may be set to an incorrect frequency, or the transmit site may not be operating on the specified frequency.
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. Throughout this section, the terms PPL and APL are used in referring to audio levels.
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. -18 TO -30 dB, 75 ohm). A. Level Adjustment Without Video or Other Channels. - If it is possible to set the subcarrier level with all other signals (i.e.
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. 4-5.Deviation Adjustment (DEV).
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.
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. 2) Squelch adjusted improperly. 3) The carrier receiver is malfunctioning.
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. Have a 450 transmitter site send a continuous tone of 1 kHz at Peak Program Level. C. Use the AUDIO screwdriver control on the front panel to adjust the receiver output to Peak Program Level. D. Do this for both channels.
J2 OUT TB1 AUDIO - ALM J2 J1 IN J1 TB1 P9 P8 T2 T3 T4 T1 P4 P3 P2 P5 S3 P4 IMPED P3 PPL P2 IMPED S2 S1 DS1 P8 P9 EMPH EMPH P5 PPL Figure 4-1 Transmitter Jumper Block Locations.
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 +18 dBm PPL P3 or P5 +9 dBm PPL 4-11. Transmitter Audio Input Impedance. - The audio input impedance selection is made with jumper block P2 for the "A" channel, and P4 for the "B" channel.
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. Failure to do so could result in a hazardous electrical shock, and/or damage to the equipment. Replace all cover plates prior to restoring power to the equipment.
J2 OUT TB1 AUDIO - ALM J2 J1 IN J1 P8 TB1 P5 P4 T3 T2 T4 T1 P4 P2 P3 S3 S2 S1 DS1 P2 P3 P4 P5 P8 PPL PPL EMPH EMPH VID HPF Figure 4-1 Receiver Jumper Block Locations.
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" channel with P5. The jumper positions (looking from the front of the unit) are: P4 or P5 P4 or P5 75 uS J.17 75 uS J.17 75µS 75 uS J.17 75 uS J.17 CCITT J.17 4-16. Input Highpass Filter.
