P. G. TM0060 REV. 0 electroni electronics cs OPERATOR'S MANUAL PCS BIDIRECTIONAL AMPLIFIER MODEL A238 P/N 001-0238-003 (LOCAL POWERED ) AUGUST 2004 RESTRICTION ON DISCLOSURE OF DATA This document contains information proprietary to P.G. Electronics and any disclosure or use of this information or any reproduction of this document for other than the specific purpose for which it is intended is expressly prohibited except as P.G. Electronics may otherwise agree in writing.
P. G. TM0060 GUARANTEE This unit is guaranteed for a period of one year from the date of shipment against failure due to defective parts or improper assembly. This guarantee is limited to replacement of defective material and does not cover damages or other costs resulting from the use of this material whether used correctly or otherwise.
P. G. TM0060 TABLE OF CONTENTS Paragraph Page SECTION 1. GENERAL INFORMATION 1.1 1.1.1 1.1.2 1.1.3 1.1.4 1.2 INTRODUCTION Scope of Manual Purpose of Equipment Physical Description Electrical Description TECHNICAL SUMMARY 1-1 1-1 1-1 1-1 1-1 1-2 SECTION 2. THEORY OF OPERATION 2.0 2.1 2.2 2.2.1 2.2.2 2.2.3 GENERAL DESCRIPTION FAULT REPORTING General Report Type Fault Conditions 2-1 2-1 2-3 2-3 2-3 2-4 SECTION 3. INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS 3.1 3.2 3.3 3.
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P. G. TM0060 SECTION 1. GENERAL INFORMATION 1.1 INTRODUCTION 1.1.1 Scope of Manual - This manual is intended to familiarize service personnel working on the PCS Bidirectional Amplifier A238 with all pertinent aspects of the amplifier. Included in this manual are a brief physical description, a technical summary, installation information and operating data. 1.1.2 Purpose of Equipment - The A238 amplifier is used as a drop-in booster for PCS signals.
P. G. TM0060 1.2 TECHNICAL SUMMARY TABLE 1-1. Performance Characteristics and Salient Features of the A238 PCS Bidirectional Amplifier Parameter Specification 1. Input Power: 24 to 28 VDC @ 2 A Max (use PS 293) 2. Frequency Range*: Uplink: 1850-1910 MHz 3. Gain: 20 dB ±2 dB 4. Impedance (Input and Output): 50 Ohms 5. VSWR: 2:1 Typical, 3:1 Maximum 6. Composite output power rating**: Uplink: +4dBm Downlink: +24dBm 7. 1dB Compression: Uplink: +12 dBm Downlink: +33 dBm 8.
P. G. TM0060 NOTE IMPORTANT RATING INFORMATION Manufacturer’s rated output power of this equipment is for single carrier operation. For situations when multiple carrier signals are present, the rating would have to be reduced as per Table 1-2, especially where the output signal is re-radiated and can cause interference to adjacent band users. This output power reduction is to be achieved by reduction of input power or by gain reduction and not by an attenuator at the output of the device.
P. G. TM0060 SECTION 2. THEORY OF OPERATION 2.0 GENERAL As explained in Section 1, the A238 is a bidirectional amplifier, which provides 20dB of gain in the PCS wireless transmit and receive bands. The block diagram of the A238 is shown in Figure 2-1. 2.1 DESCRIPTION 2.1.1 The unit is composed of band pass diplexers, amplifier stages and alarm and voltage regulation circuits. 2.1.2 The bias conditions of amplifier stages are monitored.
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P. G. TM0060 2.2 FAULT REPORTING 2.2.1 General - The A238 amplifier incorporates a number of circuits to detect deviations in important performance parameters. The unit reports alarm conditions to a remote Monitor unit such as the Model PS212. The various functions are described in this section and may also be referenced in Section 4 where the the programming of amplifier options is discussed. 2.2.
P. G. TM0060 2.2.3 Fault Conditions - The fault circuitry monitors two separate parameters in the unit. These are (a) the bias conditions of active devices in the amplifier and (b) the presence of downlink RF output power. Each function can be disabled as described in Section 4, if the unit is being used in a restricted operational mode. The DC current monitoring triggers a fault condition if the DC bias deviates outside predetermined high or low limits.
P. G. TM0060 SECTION 3. INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS 3.1 UNPACKING AND INSPECTION The following checks are recommended after receipt of the equipment from shipping agent: 1. Check for any external damage that could have occurred in transit. If damage is found, report to the shipping agent and to the supplier immediately. 2. Check that all items on the packing slip are present. If any are missing, report to the supplier immediately. 3.
P. G. TM0060 3.2 INSTALLATION The bidirectional amplifier is designed for mounting on a flat vertical surface The unit is mounted with the indicator side down for adequate air circulation. Proceed as follows: 1. Locate a suitable mounting location, allow a clearance of at least 5 inches (13 cm) to route mating cable and connectors to the unit. Drill four pilot holes on 9 x 5 inch centers for No.10 fasteners. 2. Mount the amplifier ensuring there is good air circulation around the amplifier. 3.
P. G. TM0060 9.80 9.00 -30dB 850 MHz -24dB 1.9 GHz J4 TAP VERTICAL WALL J3 TAP BNC FEMALE (2 PLACES) 7.07 5.00 J1 ANTENNA MOUNT IN THIS DIRECTION TO ALLOW AIR FLOW. 3.53 FRONT VIEW 2.82 SIDE VIEW J2 BASE N FEMALE (2 PLACES) 0.265" DIA (4 MOUNTING HOLES) PCS BIAS PWR FAULT TEST STATUS NORMAL FAULT FAULT CODE 000 FCC ID: P6T1903 FSCM 38243 MODEL A238 P/N 001-0238-003 S/N MADE IN CANADA 6.
P. G. TM0060 3.3 OPERATING INSTRUCTIONS The bidirectional amplifier has no external controls. When powered the unit will amplify signals in each direction. When the green light is on, bias conditions of active devices in all the RF paths are within specifications and the downlink power is above the minimum preset limit. The red FAULT light goes on whenever active devices in the RF paths have failed or the downlink output power is too low.
P. G. TM0060 SECTION 4. PROGRAMMING OPTIONS 4.0 PROGRAMMING OPTIONS The amplifier contains a number of options which are programmed before the unit is installed, or may be adjusted during system installation or modification. They are set in a default setting by PG before shipment. A summary diagram of these jumpers is affixed to the inside of the removable amplifier cover for use in the field, but a larger view is shown herein (Fig 4-1) together with the following description of these settings.
P. G. TM0060 4.2 ATTENUATION (AP) The amplifier has a nominal overall gain of 20 dB in the PCS frequency band, but this gain may be reduced by a built-in attenuator. The attenuator is installed on the uplink side of the amplifier and hence does not have significant impact on the uplink system noise figure. The attenuator is set for values from 0 to 15 dB by four jumpers in a binary sequence. Setting the jumpers to the “IN” position inserts, 1, 2, 4 or 8 dB attenuation in the circuit.
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P. G. TM0060 4.4 STATUS OPTION (S) If it is desired to use the amplifier in a system which has "Fault only" monitoring such as is provided by the PS200 unit, then the "OK" reports may be disabled by removing the STATUS jumper. 4.5 TEST (T) The test jumper location does not have any function in normal system operation. It is provided for use in FAT testing in the factory by speeding up the rate of OK code reporting. It should be open for normal operation. 4.
P. G. TM0060 EXAMPLE 1: H L 0 1 2 3 4 5 6 7 20 x 1 = 1 1 2 x0= 0 22 x 1 = 4 3 2 x1= 8 24 x 0 = 0 5 2 x0= 0 26 x 0 = 0 27 x 1 = 128 code = 141 U12 H = HIGH OR IN L = LOW OR OUT EXAMPLE 2: H 0 1 2 3 4 5 6 7 L 20 x 1 = 1 1 2 x1= 2 2 2 x0= 0 23 x 1 = 8 24 x 0 = 0 5 2 x 1 = 32 26 x 0 = 0 7 2 x0= 0 code = 43 U12 H = HIGH OR IN L = LOW OR OUT NOTE: DO NOT SET FAULT CODE ABOVE 199.
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P. G. TM0060 A-1 GENERAL The AUTOSET optional gain control board installs on the jumper pins normally used for manual setting of the gain control attenuators referred to in Paragraph 4.2. When installed the AUTOSET board automatically limits the amplifier output power to the maximum composite level compatible with low intermodulation performance. A-2 INSTALLATION The AUTOSET board has three jumpers which are set depending on whether the amplifier is being used as an IN-LINE or ANTENNA amplifier.
P. G. TM0060 AUTOSET SHUNT POSITIONS AM SHUNT REMOVED FOR STANDARD (TIMED) AGC MODE INSTALLED FOR CONTINUOUS AGC MODE SS AM SHUNT INSTALLED FOR INLINE AMP REMOVED FOR ANTENNA AMP SS AS AS SHUNT REMOVED FOR INLINE AMP INSTALLED FOR ANTENNA AMP PI PI Figure A-1 Autoset Shunt Positions.
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