G Way Solutions CELLB2W80CA Bi-Directional Booster User Manual BDA CELLB 2 2W 80 OCA REV1

G-Way Microwave / G-Wave Bi-Directional Booster BDA CELLB 2 2W 80 OCA REV1

manual

INSTALLATION AND OPERATING MANUAL FOR BDA-CELLB-2/2W-80-OCA OUTDOOR REPEATER
TABLE OF CONTENTS PARAGRAPH PAGE NO BDA OVERVIEW 3 BDA BLOCK DIAGRAM DESCRIPTION 3 OPTIONAL EQUIPMENT OVERVIEW 3 BDA BLOCK DIAGRAM DRAWING (Figure 1) 4 ELECTRICAL SPECIFICATIONS 5 MECHANICAL SPECIFICATIONS 6 ENVIRONMENTAL CONDITIONS 6 BDA CONNECTIONS 6 MECHANICAL OUTLINE DRAWING (Figure 2) 7 ALARM CONFIGUATION (Figure 3) 8 ALARM LED CONFIGUATION (Figure 4) 8 RF EXPOSURE WARNING 9 BDA INSTALLATION 10 BDA OPERATION 11 VARIABLE GAIN ADJUSTMENT 12 ALC ADJUSTMENT 12 DIAGNOSTICS GUIDE 13 Page 2
BDA OVERVIEW: The BDA assembly extends the coverage area of radio communications in buildings and RF shielded environments. The unit features low noise figure and wide dynamic range. It is based on a duplexed path configuration with sharp out of band attenuation allowing improved isolation between the receiving and transmitting paths. BDA CIRCUIT DESCRIPTION: Refer to figure 1 for the following discussion. The BDA Downlink path receives RF signals from the base station and amplifies and transmits them to the subscriber. The BDA Uplink path receives RF signals from the subscriber and amplifies and transmits them to the base station. The Uplink and Downlink occupy two distinct frequency bands. For example, the CELL B frequency bands are as follows: 835-849 MHz for the Uplink and 880-894 MHz for the Downlink. Two diplexers isolate the paths and route each signal to the proper amplifying channel. A selectable Automatic Level Control (ALC) allows for output power limiting. A variable step attenuator gives 0 – 30 dB of attenuation in 2 dB steps. The use of these controls is covered in the “OPERATION” section, later in this document. Page 3
Figure 1 1. 2. 3. 6. 4. 5. BDA Block Diagram 1. Up-Link Diplexer - has low bandpass insertion loss and high selectivity 2. Down-Link Pre-amp - is a low noise amplifier that drives the Down-Link HPA and offers 46dB Gain 3. Down-Link HPA – is a high power amplifier with an ALC circuit which offers 43dB Gain 4. Up-Link MPA – is a medium power amplifier with an ALC circuit which offers 43dB Gain 5. Up-Link Pre-amp - is a low noise amplifier that drives the Up-Link MPA and offers 46dB Gain 6. Down-Link Tx filter is enhanced for High Power applications, preventing arching when the power amplifier approaches the 1dB compression point. Page 4 H
ELECTRICAL SPECIFICATIONS: Frequency Range Downlink : 880-894 MHz Uplink : 835-849 MHz Pass Band Gain @ min attenuation : 80 dB (min.) Variable Step Attenuator Range : 0-30 dB (2-dB steps) Pass band Ripple : ±1.5 dB (typ) Noise Figure @+25°C at max gain : 4.0 dB max. 3rd Order Intercept point Uplink : +48 dBm (typ) Downlink : +48 dBm (typ) *Output Power @ 1dB Compression Uplink :+36dBm (typ) Downlink :+36dBm (typ) *ALC Factory Set Point Uplink : +26 dBmDownlink : +26 dBm Isolation between Up/Down Link : 100 dB min. Input/ Output Impedance : 50 Ohms VSWR (Input/Output) : 1.5: 1 max. Power Supply : 110VAC/0.89 Amp : 240VAC/0.45 Amp : 50 to 60 Hz *The 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 by 3.5 dB, especially where the output signal is re-radiated and can cause interference to adjacent band users. This power reduction is to be by means of input power or gain reduction and not by an attenuator at the output of the device. Page 5
MECHANICAL SPECIFICATIONS: Size : 16.0 x 12.0 x 8.75 inch (406 x 305 x 222 mm) Weight : 35 Lbs. (16.0kg.) approx. ENVIRONMENTAL CONDITIONS: The unit is designed for outdoor applications: Operating temperature: - 40°C to + 60°C Storage temperature: - 50°C to + 90°C BDA CONNECTIONS The BDA AC power is accepted through a 3-wire male plug with phase, neutral and ground leads. The AC power is wired to a high efficiency DC switching power supply which is CE and UL approved. The power supply runs the amplifiers and the Power ON lamp. The metal enclosure of the BDA is connected to ground. The RF connections are made via two type “N” female connectors. The RF connector labeled “BASE” must be connected to the antenna pointing towards the base station. The RF connection labeled “MOBILE” must be connected to the antenna facing the area to be covered by the BDA. The RF connections must be made through cables with characteristic impedance of 50 ohms. The isolation between the base station antenna and the mobile antenna should be at least 12 dB higher than the BDA gain. Isolation less than this value can cause gain ripple across the band. Isolation equal to or less than the BDA gain will give rise to oscillations which will saturate the amplifiers and possibly cause damage to the BDA. Page 6
CELL BOUT DOOR 2 WATT REPEATERFigure 2 BDA Mechanical Outline Page 7
Downlink Test Switch The BDA has two momentary test switches to verify the alarm function. When the uplink or downlink test switch is depressed the alarm boards uplink or downlink failure LED will illuminate. Figure 4 The alarm monitors current of both uplink and downlink amplifiers. An alarm condition will occur if either uplink or downlink amplifiers are over or under its current tolerance. Page 8 Uplink Test Switch Alarm Board Amplifier Status LEDs Green LED-System OK Red LED – Uplink Fail Red LED –Downlink Fail Figure 3 Alarm Test Switches
RF EXPOSURE WARNING In order to satisfy the FCC RF exposure requirements, the BDA/antenna installation must comply with the following: The outdoor antenna (Yagi type or similar directional antenna) must be installed so as to provide a minimum separation distance of 0.3 meters (30 cm) between the antenna and persons within the area. (This assumes a typical antenna with gain of [10.1 dBi, VSWR ≤ 1.5:1, Zo= 50 ohms, and a cable attenuation of between 1-10 dB). The indoor antenna (omni directional) must be installed so as to provide a minimum separation distance of 0.2 meters (20 cm) between the antenna and persons within the area. (This assumes a typical wide-beam type antenna with gain of 0-2 dBi, VSWR ≤ 2:1, Zo= 50 ohms, and a cable attenuation of between 1-10 dB). Page 9
OUTDOOR BDA INSTALLATION PROCEDURE IMPORTANT: DO NOT APPLY A.C. OR DC POWER TO THE BDA UNTIL CABLES ARE CONNECTED TO BOTH PORTS OF THE BDA AND THE ANTENNAS. 1. Mount the BDA on the wall with the RF connectors pointing DOWN. Using appropriate screws and anchors, attach the BDA to the wall at the six mounting holes on the side flanges. 2. Ensure that the isolation between the donor antenna and the service antenna is at least 12 dB greater than the BDA gain. (Use the higher of the Uplink and Downlink gains reported on the BDA test data sheet). 3. Connect the cable from the donor antenna to the BDA connector labeled “BASE” and the cable from the service antennas to the BDA connector labeled “MOBILE”. 4. Open the access door on the BDA and verify that the Uplink and Downlink ALC switches are in their factory preset “ON” positions. Close the door. 5. Connect the AC power cord to the BDA and then to the power source. Verify that the “Power On” indicator is lit. Installation of the BDA is now complete. To adjust the gain controls to suit the specific signal environment, refer to “Outdoor BDA Operation”. Note: For repeat installations of existing equipment, make sure the ALC switches are in the “ON” position and attenuation is positioned to its maximum setting (30 dB). After verification of ALC switches and attenuation, follow the above steps starting with step 1. Page 10
BDA OPERATION Variable Step Attenuator BDA gain can be reduced by up to 30 dB in 2 dB steps using the variable step attenuator (Figure 3). Gain adjustment is made with rotary switches accessible via the access door on the BDA enclosure. Arrows on the shafts of these switches point to the value of attenuation selected. BDA gain can be determined by subtracting the attenuation value from the gain reported on the BDA Test Data Sheet for that side of the unit. The attenuators are labeled for Uplink and Downlink. ALC (Automatic Level Control) To minimize intermodulation products, the Uplink amplifier in the BDA contains an ALC feedback loop (Figure 4). The ALC circuit senses the output power and limits it to the factory preset level of +26 dBm. ALC function is selected with on/off toggle switches located on each amplifier and accessible when opening the door on the BDA enclosure. A red indicator lamp located on each amplifier illuminates when output power meets or exceeds the ALC set point. The indicator is functional regardless of the position of the ALC switch. Units are shipped with both ALC switches in the “ON” position. To ensure distortion-free operation limited to the set point, keep both the ALC switches turned ON. To establish proper operating gain on the Uplink and Downlink sides, start with the Downlink. Verify that the ALC switch is in the “ON” position. Observe the red indicator lamp on the Downlink amplifier. Units are shipping with maximum attenuation. Decrease attenuation one step at a time until the lamp is lit. Then, using the Downlink step attenuator, increase the attenuation until the lamp goes off. Repeat the process for the Uplink. The level indicator is accurate to +/- 0.4 dB of the ALC set point. Note: The recommended operation of the BDA is when the factory set ALC is turned on. Operation of the BDA in the alarm condition will void the warranty, and output power should be immediately reduced using the variable step attenuator. Operation of BDA-CELLB-2/2W-80-OCA at maximum gain with greater than -43 dBm average power incident on the MOBILE or BASE ports can cause damage to the BDA. Page 11
030UPLINK030DOWNLINKFigure 4 Variable Gain Adjustment Access Figure 5 ALC Adjustment Access Page 12 ALCUPLINKOFFON Alarm Board and Momentary test switches Up-Link MPA ALC circuit inside Down-Link MGC Down-Link MPA ALC circuit inside AC Power Surge Protection Up-Link MGCALC DOWNLINK OFFON
DIAGNOSTICS GUIDE The BDA provides long term, care-free operation and requires no periodic maintenance. There are no user-serviceable components inside the BDA. This section covers possible problems that may be related to the installation or operating environment. a. Gain Reduction Possible causes: Bad RF cables and RF connections to antennas, Damaged antennas. b. Excessive Intermodulation or Spurious Possible causes: Amplifier oscillation caused by insufficient isolation. The isolation between two antennas is given by the equation: Isolation = 92.5 + 20 Log (F x D) – Gt – Gr Where: F = frequency (GHz) D = separation (Km) Gt = transmit antenna gain (in the direction of the receive antenna). Gr = receive antenna gain (in the direction of the transmit antenna). For example, at the SMR frequencies, the antenna isolation at 100 m separation is about 71 dB for omni-directional antennas (0 dB gain). To increase isolation, the antennas should have higher directivity and must be pointed away from each other. c. Occasional Drop-out of some Channels Possible causes: One channel with very strong power dominates the RF output of the amplifier. 38 Leuning Street South Hackensack, NJ 07606 Tel. 201-343-3140 Fax 201-343-6390 sales@gwaverf.com www.gwaverf.com Page 13

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