Installationand OperatingManual LTELowerA,B&CBands,BiDirectionalAmplifier BDALTE/LABC33/3390AB TABLE OF CONTENTS Table of Contents OVERVIEW: ............................................................................................................................... 3 OPERATIONAL DESCRIPTION: .............................................................................................. 3 ELECTRICAL SPECIFICATIONS: ........................................................................................... 4 MECHANICAL SPECIFICATIONS: ......................................................................................... 5 ENVIRONMENTAL CONDITIONS: ........................................................................................ 5 FCC NOTE: ................................................................................................................................. 5 IC NOTE: ..................................................................................................................................... 5 NOTE: .......................................................................................................................................... 5 RF EXPOSURE WARNING-FCC: ............................................................................................. 5 RF EXPOSURE WARNING- INDUSTRY CANADA: ............................................................. 6 BDA-LTE/UC-33/33-90-AB Mechanical Outline (Figure 2): .................................................... 7 OPTIONAL ALARM CONDITIONS: ........................................................................................ 7 INSTALLATION: ....................................................................................................................... 8 OPERATION: .............................................................................................................................. 9 FRONT PANEL CONNECTORS (Figure 3) ............................................................................ 10 INNER PANEL UL/DL GAIN ADJUSTMENT ....................................................................... 10 DIAGNOSTICS GUIDE ............................................................................................................ 11 Page | 2 OVERVIEW:
The BDA-LTE/LABC-33/33-90-AB assembly enhances the coverage area of radio communications in buildings and RF shielded environments. The BDA-LTE/LABC-33/33-90-AB has dual RF paths (Forward / Reverse) to improve coverage in two distinct frequency bands. The unit features low noise figure and wide dynamic range. It is based on a dual duplexed path configuration with sharp out of band attenuation allowing improved isolation between the receiving and transmitting paths. OPERATIONAL DESCRIPTION:
The BDA-LTE/LABC-33/33-90-R3U15 Downlink path receives RF signals from the base station, amplifies the signal and transmits the signal into a Distributed Antenna System at the direction of the mobiles. The signal travels over a DAS medium that then dissipates the signal to the Mobile subscribers. The BDA-LTE/LABC-33/33-90-
AB Uplink path receives RF signals at the Mobile side from the DAS system, then amplifies it, and transmits the amplified signal to the base station. The Uplink and Downlink occupy two distinct dedicated frequency bands, each Uplink and Downlink band is 18MHz wide. For LTE Lower A, B and C Band, the frequency allocations are as follows:
Uplink: 698-716 MHz Downlink: 728-746 MHz Four diplexers isolate the paths and route each signal to the proper amplifying channel. An 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
: 0-30 dB
: 85 dB (Typ.)
: 2.0 dB (Typ.)
: UL 698-716 MHz DL 728-746 MHz ELECTRICAL SPECIFICATIONS:
Frequency Range G-Wave units are factory tuned, there is no user-serviceable deviation from the frequency bands listed above. Pass band Gain @ min attenuation Variable Step Attenuator Range
(2-dB steps) Pass band Ripple Noise Figure (Uplink)
@+25C at max gain 3rd Order Intercept point Downlink Uplink Output Power (Composite)*
Downlink Uplink Isolation between Up/Down Link Input/ Output Impedance
*SFDR VSWR (Input/Output) Power Supply
: +52 dBm (Typ.)
: +52 dBm (Typ.)
: +33 dBm (Typ.)
: +33 dBm (Typ.)
: 100 dB (Min.)
: 120 dB/Hz2/3
: 4.5 dB (Typ.)
: 50 Ohms
: <1.5: 1
: 110VAC/0.66 Amps
: 220VAC/0.33 Amps
: 50 to 60 Hz Page | 4 MECHANICAL SPECIFICATIONS:
Size RF Connectors Weight
: 6.5 x 15.4 x 8.0 inch
: (165.1 x 391.16 x 203.2 mm)
: N-Type Female
: 32.0 Lbs. (14.5 kg.) approx. ENVIRONMENTAL CONDITIONS:
The unit is designed for indoor applications:
Operating temperature: - 30C to + 55C Storage temperature: - 50C to + 90C FCC NOTE:
The Federal Communications Commission (FCC) has tested this product and found it to comply with their RF Exposure Requirements, pursuant to FCC Part 27. IC NOTE:
The Industry Canada (IC) has tested this product and found it to comply with their RF Exposure Requirements, pursuant to IC RSS-131. NOTE:
The Manufacturers 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. RF EXPOSURE WARNINGFCC:
In order to comply with the FCC RF exposure requirements, the BDA-LTE/LABC-33/33-90-AB antenna installation must comply with the following:
The outdoor antenna (Yagi type or similar directional antenna if off air donor signal used) must be installed so as to provide a minimum separation distance of 44 cm between the antenna and persons within the area. (This assumes a typical antenna with gain of [7.5 dBi, VSWR 1.5:1, Zo= 50 ohms). The indoor antenna (Omni directional) must be installed so as to provide a minimum separation distance of at least 23 cm between the indoor antenna connected to the RF booster and the human users body within the area. (This assumes a typical wide-beam type antenna with gain of 0-2 dBi, VSWR 2:1, Zo= 50 ohms,). Page | 5 RF EXPOSURE WARNING INDUSTRY CANADA:
In order to comply with the IC RF exposure requirements, the BDA-LTE/LABC-33/33-90-AB antenna installation must comply with the following:
The outdoor antenna (Yagi type or similar directional antenna if off air donor signal used) must be installed so as to provide a minimum separation distance of 64 cm between the antenna and persons within the area. (This assumes a typical antenna with gain of [7.5 dBi, VSWR 1.5:1, Zo= 50 ohms). The indoor antenna (Omni directional) must be installed so as to provide a minimum separation distance of at least 33 cm between the indoor antenna connected to the RF booster and the human users body within the area. (This assumes a typical wide-beam type antenna with gain of 0-2 dBi, VSWR 2:1, Zo= 50 ohms,). CONNECTIONS:
The BDA AC power is accepted through a circular 3-wire female 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 LED indicators. The metal enclosure of the BDA is connected to ground. A 7-pin circular connector provides failure and Oscillation Detect alarms output dry contacts, Normally Open and Normally Closed (see diagrams on page 8). 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 / passive DAS 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 BDALTE/UC33/3390AB Mechanical Outline (Figure 2):
OPTIONAL ALARM CONDITIONS:
(Figure 2a) 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. Also Oscillation detect Alarm would be provided on the other pair dry contacts.
(Relay Shown in Non-Alarm Condition) Page | 7 INSTALLATION:
DO NOT APPLY A.C. 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 four 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 main access front panel of the BDA (using the Allen Key located on the side of the BDA) and verify that both of the attenuators are positioned to its maximum setting (30 dB). Close the main panel. 5. Connect the AC power cord to the BDA and then to the power source. Verify that the Power ON Green LED indicator is illuminated. Installation of the BDA is now complete. To adjust the gain controls to suit the specific signal environment, refer to the next section of the manual. Note: For repeat installations of existing equipment, make sure the attenuation is positioned to its maximum setting (30 dB). After verification of the attenuation, follow the above steps starting with step 1. Page | 8 OPERATION:
Refer to Figure 3 & 3a for adjustment access location, connectors and labels. Variable Step Attenuator BDA gain can be reduced by up to 30 dB in 2 dB steps using the variable step attenuator. 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, each amplifier in the BDA contains an ALC feedback loop. The ALC circuit senses the output power and automatically limits it to the factory preset level of +33 dBm UL and +33 dBm DL. ALC function is located in each power amplifier. A red LED indicator located on the Front main panel (see figure 3) illuminates when output power meets or exceeds the ALC preset point. To establish proper operating gain on the Uplink and Downlink sides, start with the Downlink. Observe the red LED indicator on the Downlink amplifier. Units are shipping with maximum attenuation. Decrease attenuation one step at a time until the red LED is lit. Then, using the Downlink step attenuator, increase the attenuation until the red LED goes off. Repeat the process for the Uplink. . This setup should be done under RF signal transmit for either path the level indicator is accurate to +/- 0.4 dB of the ALC set point. G-Wave BDAs will automatically limit the output power of the system to the established ALC setting of the unit, +33 dBm. An LED indicator will illuminate to inform the operator that maximum output signal has been achieved during the gain adjustment process. Note: Operation of BDA-LTE/LABC-33/33-90-AB at maximum gain with greater than -40 dBm average power incidents on the MOBILE or BASE ports could cause damage to the BDA. Page | 9 FRONT PANEL CONNECTORS (Figure 3) AC Power Connector DC Power Connector Optional Alarm Connector INNER PANEL UL/DL GAIN ADJUSTMENT
(Figure 3a) Downlink ALC and Alarm LEDs Uplink ALC and Alarm LEDs Power LED Uplink and Downlink Rotary Attenuators Page | 10 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. Gain Reduction Possible causes: Defective RF cables and RF connections to antennas, damaged antenna or Leaky cable. Excessive Intermodulation or Spurious Possible causes: Amplifier oscillation caused by insufficient isolation. The isolation between two antennae 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 the LTE 750 MHz frequencies, the antenna isolation at 100 m separation is approximately 93.3 dB for Omni-directional antennas or leaky cable (0 dB gain). To increase isolation, the antennas should have higher directivity and must be pointed away from each other. Occasional Drop-out of some Channels Possible causes: One channel with very strong power dominates the RF output of the amplifier. Page | 11