GSM 900MHz out of Band Frequency Shift Cellular Repeater

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Product origin: Shenzhen, Guangdong, China

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US$ 20 ~ 50

Description

Specifications of GSM900 OUT Band Frequency Shift Repeater
Model: BT-DH40G&BT-DF43G

The Frequency Shift Repeater (FSR) is designed to solve problems of weak mobile signal, which can expand more coverage than RF repeater and reduce investment for the areas where fiber optic or dedicated cable is not allowed.
The system consists of two parts: Donor Unit and Remote Unit. The Donor Unit receives the BTS (Base Transceiver Station) signal via open air RF transmission or direct coupler closed to BTS, then converts it from the working frequency to the link frequency, and transmits the amplified signal to the Remote Unit that will reconvert the signal to the working frequency and provide the signal to the areas where network coverage is inadequate. And the mobile signal is also amplified and retransmitted to the BTS via the opposite direction.
As per operator's requirement for link frequency, two types of FSR are available:

In-Band FSR: the link frequency is inside the working band
Out-of-Band FSR: the link frequency is out of the working band

Features

Aluminum-alloy casing with IP65 protection has high resistance to dust, water and corroding
No interference to BTS by adopting linear amplifier with high gain and low noise
Adopting filter with highly selectivity and low insertion loss eliminates interference between uplink and downlink
USB port provides a link to a notebook for local supervision or to the built-in wireless modem to communicate with the NMS (Network Management System) that can remotely supervise repeater's working status and download operational parameters to the repeater

Applications

To expand signal coverage or fill signal blind area where signal is weak or unavailable.

Outdoor:	Airports, tourism regions, golf courses, tunnels, factories, mining districts, villages, …
Indoor:	Hotels, exhibition centers, basements, shopping malls, offices, parking lots, …

Application Diagram

Technical Specifications

Item				Donor Unit		Remote Unit
				GSM900
Working Frequency (Customized)			Uplink	890~915MHz
			Downlink	935~960MHz
Link Frequency (customized)				Customized
Max. Input Power (Non-Destructive)				10dBm
Transmission Distance				≤ 20km
No. of Channels (for channel shift)				1 / 2/4
Frequency Error				≤ 0.05ppm
Phase Distortion across bandwidth				≤ 6.1° (RMS) & ≤ 24.5° (Peak)
Error Vector Magnitude (EVM)				≤ 12.5%
Maximum Output Power(Customized)		Uplink		Wireless access	≥ 30dBm		≥ 33dBm
				Cable access	≥ 0dBm
		Downlink		40dBm			43dBm
Maximum Gain				Wireless access	≥ 85dB		≥ 90dB
				Cable access	≥ 45dB
Gain Adjustment Range				1~31 dB @ step of 1 dB
Voltage Standing Wave Ratio				< 1.5
Noise Figure				≤ 5dB(only for uplink)
Spurious Emission	Within working band			≤ -15dBm/30kHz
	Out of working band (f > 2.5MHz)			9kHz~1GHz: ≤ -36dBm/30kHz
				1GHz~12.75GHz: ≤ -30dBm/30kHz
Third-order Inter-modulation				≤ -45dBc / 30kHz (measured under rated output power)
In-band Ripple				≤ 3dB
System Delay				≤ 10μSec
I/O Impedance				50Ω
RF Connector				N-Type (Female) / Changeable / bottom of casing
Temperature Range				Operation: -25°C ~ + 55°C / Storage: -30°C ~ +60°C
Relative Humidity Range				≤ 95% (non condensing)
Power Supply (customized)				DC-48V or AC110V or AC220V,50/60Hz
Power consumption				≤ 160W			≤ 200W
Backup Power Supply (optional)				4 hours
Casing Level				IP65
Dimensions				428328220mm
Weight				25kg			30kg
NMS Monitoring Function (optional)				Real-time alarm for door status, temperature, power supply, LNA, VSWR, self-oscillation, etc; Remote control such as turn on/off, increasing/decreasing output power, changing channel frequency, etc; Real-time status for output/input power, UL/DL gain, all status of repeater etc.

Installation & Commissioning

1.1 Installation

1.1.1 Steps for mounting on the Pole

At Donor site, install the FSR Donor Unit, Donor Antenna, Link Antenna, and RF cable as per specified plan and site layout. FSR Donor Unit can be pole-mounted using the brackets as shown below.
Place M8 screws through the holes of H type brackets as shown in figure 1
Fix combiner onto the H type brackets with M6 screws
Fix H type brackets with combiner installed onto the pole with U type brackets and M8 screws

Figure 1 Repeater Mounting Bracket

Orient the Link Antenna of Donor Site to the direction of the Remote Site.
Use Site Master to measure the VSWR of the RF cable from the Link Antenna. The value should be less than 1.5; Otherwise, check the connectors and the installation of the cable.
Start Commissioning the Donor Unit .
Proceed to the Remote Site.
At Remote site, install the FSR Remote Unit, Link Antenna, Coverage Antenna, and RF cables. Remote Unit can be wall mounted or pole mounted depending on the approved plan.
Orient the Remote Link Antenna to the direction of the Donor Site.
Using Spectrum Analyzer, check the Link RSL; adjust the Link Antennas of both Donor and Remote until the required RSL is achieved. Link RSL can be computed using conventional path calculation method.
Then, measure the VSWR of the RF cables connecting with the Link Antenna of Remote Unit. The value should be less than 1.5, otherwise, check the connectors and the installation of the cable.
Start Commissioning the Remote Unit .

1.1.2 Steps for mounting on the wall

At Donor site, install the FSR Donor Unit, Donor Antenna, Link Antenna, and RF cable as per specified plan and site layout. FSR Donor Unit can be wall-mounted using the brackets as shown below.
Make four marks on the wall according to the dimension shown as figure 2
Drill four holes at position marked
Fix two pcs H type brackets on the wall with M8 expansion screws
Fix combiner onto the brackets with M6 screws

Figure 2 Repeater Mounting Bracket

6. The following steps are the same with step 4 to 12 for mounting on the Pole.

1.2 Commissioning

Connect the RF cable from Donor Antenna to the spectrum analyzer and check if the Donor Antenna is receiving the correct frequency; and then measure the signal level of the said frequency (RSL). Adjust the antenna to make the readings approach the recorded value on the survey report. Record all readings.
Inside the repeater, disconnect the uplink duplexer to the ICS module so as to cut any signal coming from air going to the uplink duplexer and thus protecting the amplifier from damaging. Connect a 30 dB attenuator to the output of the repeater; this attenuator will serve as a load for the repeater. The purpose of this attenuator is to protect the equipments from damaging.
Turn ON the repeater. Observe the LED display on the NMS board. Check for any alarm. Under normal condition, the POWER LED should be always green and the RUN LED should be blinking, the ALARM LED should be not bright with red color.

Figure3 Interface of NMS Board

Connect your laptop to the repeater via the data cable.

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