User's Manual

ManualsBrandsP.G.Electronics ManualsElectronicsDual Band Bidirectional Amplifier

P.G. TM0040AE

1-4

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. The composite output power rating is defined as the total average RMS

output power of all inband signals. The unit should be operated at or below this level to

ensure linear operation with low distortion. At this level, intermodulation products will be

typically 50 dB below the carrier signals. This holds true for any number of carriers with

total average power adding up to the composite output power rating listed in the table

below.

Cellular Base Transmit (Downlink) + 24 dBm

Cellular Portable Transmit (Uplink) + 9 dBm

PCS Base Transmit (Downlink) + 24 dBm

PCS Portable Transmit (Uplink) + 4 dBm

Summary of content (18 pages)

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P.G. TM0040AE 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. The composite output power rating is defined as the total average RMS output power of all inband signals. The unit should be operated at or below this level to ensure linear operation with low distortion.
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P.G. TM0040AE SECTION 2. THEORY OF OPERATION 2.0 GENERAL As explained in Section 1, the A289 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 amplifier 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 - The diplexers U1 and U2 combine the cellular and PCS bidirectional amplifiers.
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P.G. TM0040AE 2.2 FAULT REPORTING 2.2.1 General - The 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 programming of amplifier options is discussed. 2.2.
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P.G. TM0040AE 2.2.3 Fault Conditions - The A289 circuitry monitors four separate parameters in the unit. These are: (a) the bias currents drawn by devices in 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.
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P.G. TM0040AE 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.
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P.G. TM0040AE 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.
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P.G. TM0040AE 3.3 OPERATING INSTRUCTIONS The A289 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 a monitored active device in the RF paths has failed or the downlink output power is too low.
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P.G. TM0040AE 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 P.G. 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.
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P.G. TM0040AE 4.2 ATTENUATION (AC AND AP) The A289 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 in a binary sequence.
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P.G. TM0040AE 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.
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P.G. TM0040AE 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.
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