Summary of Contents for ITS Telecom ITS-5523
- Page 1 CORPORATION TECHNICAL MANUAL EXHIBIT II (PRELIMINARY) ITS-5523 DIGITAL TRANSMITTER REV: 0 102 Rahway Road McMurray, PA 15317 USA Phone 412-941-1500 FAX 412-941-9421...
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Page 2: Table Of Contents
ITS-5523 DIGITAL TRANSMITTER TABLE OF CONTENTS INTRODUCTION: SYSTEM ITS-5523: ............................1555-1103 A. SYSTEM DESCRIPTION B. SPECIFICATIONS C. FRONT PANEL LED INDICATORS AND CONTROLS D. PRINTED CIRCUIT BOARD INDICATORS AND DESCRIPTIONS E. SYSTEM ALIGNMENT PROCEDURE F. REAR PANEL CONNECTIONS G. REMOTE CONTROL INTERFACE III. -
Page 3: System Description
The outside dimensions of the tray assembly are 19" x 21" x 8.75" (W x D x H). The ITS-5523 is factory calibrated for a front panel power meter reading of 100%, which represents the rated output power of the unit (unless otherwise specified). - Page 4 ITS-5523 THEORY OF OPERATION - Continued A L.O. (local oscillator) signal is generated on the UHF Generator Board. This Board is comprised internally of a voltage controlled crystal oscillator circuit and a x8 multiplier consisting of three x2 broadband doublers = x8) which produces the local oscillator signal (L.O.) signal..
- Page 5 ITS-5523 THEORY OF OPERATION - Continued The Six Section Bias Board (1519-1136) supplies the two amplifier modules with both +10 VDC (operating voltage) and -5 VDC (bias voltage). The Transmitter Control Board (1555-1214) provides the capability to control and monitor the operating status of the transmitter.
- Page 6 ITS-5523 THEORY OF OPERATION - Continued AC Voltage Source The transmitter may be configured to be powered by either a 115 VAC/60Hz or 230 VAC/50Hz by the following procedures. 230 VAC to 115 VAC Operation Locate the 10 position terminal block (TB1) within the transmitter. Referring to Interconnect drawing 1555- 8102, remove the jumper between positions 2A and 3A.
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Page 7: Specifications
ITS-5523 DIGITAL TRANSMITTER TRAY (11555-1102) SPECIFICATIONS Technical Specifications Type of Emissions........................... 6M00D7W Frequency Range ..........2150 to 2162 and 2500 to 2686 MHz (any 6 MHz channel) Output Power Rating ..................5 to 10 watts total average DC voltage and total current of final amplifier stage ........... 10 volts DC at 24 amps... -
Page 8: Front Panel Led Indicators And Controls
ITS-5523 FRONT PANEL METER, CONTROLS, AND LED INDICATORS The ITS-5523 front panel provides operating controllability, metering capability and status indication. These features provide an effective means to determine the over-all operating status of the transmitter at a glance. Controls ON/OFF (Rear Panel) Provides control of AC to the tray as well as circuit protection. - Page 9 ITS-5523 FRONT PANEL METER, CONTROLS, AND LED INDICATORS - Continued One front panel label is provided for channel indication. CHANNEL Indicates the operating channel. Two front panel sample ports provide for monitoring specific RF levels: CHANNEL OSCILLATOR Provides a sample from the channel oscillator. Nominal...
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Page 10: Printed Circuit Board Indicators And Descriptions
ITS-5523 PRINTED CIRCUIT BOARD LED INDICATORS AND DESCRIPTIONS There are both red and green LED indicators located within the transmitter. The green LEDs, when lit, show that the function indicated is operating correctly. The red LEDs, when lit, show a malfunction of the function indicated. -
Page 11: System Alignment Procedure
ITS-5523 SYSTEM ALIGNMENT PROCEDURE Connect a suitable load to the output of the Upconverter/Amplifier tray. Turn the circuit breaker (CB1) located on the back of the tray to the on position. Place the Upconverter/Amplifier in standby by pressing the standby switch on the front panel. The amber front panel indicator will light indicating that the Upconverter/amplifier is in standby. - Page 12 ITS-5523 SYSTEM ALIGNMENT PROCEDURE - Continued ALC/AGC Board (A6) 1022-1102 Adjust Inner Loop potentiometer R63 for 0.8 volts at TP7. Place switch SW2 into the AGC position. Adjust AGC potentiometer R96 for 100% on the front panel meter. Phase Corrector Board (A34) 1227-1250 The Phase Corrector Board corrects for phase non-linearities of the amplifier stages later in the system.
- Page 13 ITS-5523 SYSTEM ALIGNMENT PROCEDURE – Continued UHF Generator Board (A15-A1) 1512-1101 1. Connect the main output from the channel oscillator section of the UHF Generator Board (J1) to a spectrum analyzer, tuned to the crystal frequency and peak the tuning capacitors C6 and C11 for maximum output.
- Page 14 MMDS PROGRAMMING CHART FOR VHF GENERATOR CONTROL BOARD (1555-1214) OSCILLATOR (1 = HIGH) VISUAL L.0. = FREQUENCY = (0 = LOW) CHANNEL CARRIER +45.75 (L.O./24 NUMBER (MHz) MHz) MHz) (S1) (S2) (S3) (S4) 2501.25 2547.00 106.125 1101 1000 1100 1111 2513.25 2559.00 106.625...
- Page 15 MDS PROGRAMMING CHART FOR VHF GENERATOR CONTROL BOARD (1555-1214) OSCILLATOR (1 = HIGH) VISUAL L.0. = FREQUENCY = (0 = LOW) CHANNEL CARRIER +44.75 (L.O./24 NUMBER (MHz) MHz) MHz) (S1) (S2) (S3) (S4) MDS1 2151.25 2196.00 87.875 1100 1001 0100 1000 MDS2 2157.25...
- Page 16 ITS-5523 SYSTEM ALIGNMENT PROCEDURE – Continued Upconverter Board (A4) 1519-1125 This board does not contain any RF tuning adjustments. The Upconverter Module produces an RF output at J2 by mixing two input signals (L.O. and I.F.) which are applied to J1 and J4 respectively.
- Page 17 ITS-5523 SYSTEM ALIGNMENT PROCEDURE – Continued 50 Watt Amplifier Module (A10-A3) 1512-1107 This Amplifier module does not contain any RF tuning adjustments. The module contains two cascaded broadband GaAs FET amplifier stages (FLL200-3 driving four parallel FLL200-3 's) providing a nominal gain of 18 dB. The operating current for each device (Q101, Q201, Q301, Q401,and Q501) is controlled by a pot mounted on a bias board within the module, next to each corresponding FET, and can be set by measuring the voltage drop across the .05 Ω...
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Page 18: Rear Panel Connections
ITS-5523 REAR PANEL CONNECTIONS The rear panel of the ITS-5523 provides quick and easy access to all of the external connections necessary to interface the transmitter to the outside world. CONNECTOR CONNECTOR NUMBER TYPE Provides input transmitter IF INPUT Provides an external IF input from the MMDS Receiver tray (50 Ω... -
Page 19: Remote Control Interface
ITS-5523 REMOTE CONTROL INTERFACE All remote/control functions are accessed through a 37 position "D" connector (J12) and two RJ45 connectors (J16 and J17) located on the rear panel of the Upconverter/Amplifier. CONNECTION Control: REMOTE OPERATE REMOTE STANDBY EXTERNAL OPERATE COMMAND... - Page 20 ITS-5523 DIGITAL TRANSMITTER DRAWING LIST UPCONVERTER/AMPLIFIER TRAY The UPCONVERTER/AMPLIFIER TRAY consist of the following boards/modules: x3 Multiplier Assembly..............................1003-1004 UHF Generator Board ............................... 1512-1101 Schematic ..................................1512-3101 50 Watt Output Amplifier Module..........................1512-1107 Schematic ..................................1512-3107 +12 VDC Power Supply Board............................1512-1119 Schematic ..................................
- Page 21 ITS-5523 DIGITAL TRANSMITTER DRAWING LIST UPCONVERTER/AMPLIFIER TRAY Upconverter Board................................1555-1225 Schematic ..................................1555-3225 SCADA Controller Board..............................1519-1107 Schematic ..................................1519-3107 Scada Connector Board..............................1519-1102 Schematic ..................................1519-3102 IF Phase Corrector Board ..............................1227-1250 Schematic ..................................1227-3250 UHF Amplifier Board ................................ 1506-1206 Schematic ..................................
- Page 25 MAINTENANCE AND TROUBLESHOOTING Problem Analysis In most cases, the performance of a GaAsFET transistor is closely tied to the DC operation of the system. Any degradation in signal quality, gain or power is usually related to a corresponding change in a DC parameter somewhere in the system.
- Page 26 The amount of cleaning necessary depends greatly on the conditions in the translator room. While the electronics have been designed to function well even if covered with dust, heavy buildups of dirt and insects will impede the effectiveness of the cooling and lead to shutdown or premature failure. When it is apparent that the front panel is becoming dust covered, the top cover should be opened and the accumulated foreign material removed.
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