P.G. TM0032FE TABLE 1-2 Rated Power Output for Linear Operation (for intermodulation products 50 dB down) The Total Composite output power in multiple tone or wideband signals shall NOT exceed the following level or else it may result in improper operation of the device and cause interference.
P.G. TM0032FE SECTION 2. THEORY OF OPERATION 2.0 GENERAL As explained in Section 1, the A211 is a bidirectional amplifier, which provides 20 dB of gain in both the cellular and PCS wireless transmit and receive bands. The block diagram of the A211 is shown in Figure 2-1. 2.1 DESCRIPTION 2.1.1. - The unit is composed of two diplexers, two independent bidirectional amplifiers and alarm and voltage regulation circuits. 2.1.2.
P.G. TM0032FE Figure 2-1.
P.G. TM0032FE 2.2 FAULT REPORTING 2.2.1 General - The A211 amplifier incorporates a number of circuits to detect deviations in important performance parameters. The standard unit (P/N 001-0211-002) reports alarm conditions to a remote Monitor unit such as the Model PS212. The local powered unit has local status indication only. The various functions are described in this section and may also be referenced in Section 4 where the programming of amplifier options is discussed. 2.2.
P.G. TM0032FE 2.2.3 Fault Conditions - The A211 circuitry monitors four separate parameters in the unit. These are (a) the bias currents drawn by the transistors in each of the cellular and PCS amplifiers and (b) the presence of downlink RF output power in each amplifier band. Each function can be disabled as described in Section 4, if the unit is being used in a restricted operational mode.
P.G. TM0032FE 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. TM0032FE 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: Standard unit (P/N 001-0211-002): 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 7.63 x 5 inch centers for No.10 fasteners. 2.
P.G. TM0032FE Local powered unit (P/N 001-0211-003): 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 7.63 x 5 inch centers for No.10 fasteners. 2. Mount the amplifier ensuring there is good air circulation around the amplifier. 3. Connect J2, "BASE" to the cable leading to the base transmitter. 4. Connect J1, "ANTENNA" to the cable leading to the distribution antenna(s). 5.
P.G. TM0032FE Figure 3-1.
P.G. TM0032FE 3.3 OPERATING INSTRUCTIONS The A211 dual band bidirectional amplifier has no external controls. When powered the unit will amplify signals in each band and 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 in each band is above the minimum preset limit. The red FAULT light goes on whenever any of the active devices in the RF paths has failed or the downlink output power is too low.
P.G. TM0032FE SECTION 4. PROGRAMMING OPTIONS 4.0 PROGRAMMING OPTIONS The A211 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.
P.G. TM0032FE 4.2 ATTENUATION (AC AND AP) The A211 has a nominal overall gain of 20 dB in both the cellular and PCS frequency bands, but this gain may be reduced by built-in attenuators included in each frequency band. The attenuators are installed on the uplink side of the amplifier and hence do not have significant impact on the uplink system noise figure. The attenuator for each band is set for values from 0 to 15 dB by four jumpers switches in a binary sequence.
P.G. TM0032FE Figure 4-1.
P.G. TM0032FE 4.4 STATUS OPTION (S) If it is desired to use the A211 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. TM0032FE Figure 4-2. Fault Code Setting Examples .
P.G.
P.G. TM0032FE 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 in each band to the maximum composite level compatible with low intermodulation performance.
P.G. TM0032FE AU TO SET SH U N T PO SITIO N S CI AM SS AS PI Figure A-1. Autoset Shunt Positions.
P.G. TM0032FE TABLE A-1.
