GSM DCS Digital Compander Repeater frequency shift booster

GSM DCS Digital Compander Repeater Frequency Shift Booster   Description  The remote village can’t receive the signal from town base station because of long distance. If we adopt the original signal frequency of 900MHz and 1800MHz, it’s easy to affect by the outside condition and the loss of wireless propagation path is biggish. Also the signal is easy to block off by the complicated Montana landform. So we need a system which uneasy to affect by outside condition and with powerful diffraction to transmit and cover, achieve large-scale wireless communication service to villages. Direct against the above situation, the Enclave Companding System has researched. It compress the communication signal form wide bandwidth to narrowband via simulate channelized, band selective or digital channelized, then transmit the signal in long distance. The Enclave Companding System compress the donor signal from 24M bandwidth of 900M band to 4M bandwidth of 150M or 230M band, in remote expand the intermediate frequency to the original 900M band, then cover after linear amplification. The advanced compression and filtering technology debase the device interference to network system. Availably solve the signal coverage problem in hilly,mountainous and silvan areas, also in coverage areas with lean frequency resource.     As per the method of source picking up by the Donor Unit, the FSR can be sorted into Cable-Access FSR and Wireless-Access FSR. Cable-Access FSR: receive base station signal via a coupler link to the base station; Wireless-Access FSR: pick up base station signal in air via Donor Antenna (applicable when the coverage areas under outspread are far away from base station).         Features & Benefits Auto diagnostics: Repeaters are equipped with a microprocessor module that controls the unit operational parameters. This self check capability provides an instantaneous alarm output under failure situation, via local LEDs. Microprocessor module verifies amplifies status, PA status, power supply status, intermediate filters status, battery backup status and temperature levels.   Control: Repeaters can be controlled locally via the control panel or via RS-232, and can be remote controlled using OMS (Operation and Maintenance Software) via wireless connection. In both situations, local and remote. Repeaters parameters can be adjusted (UL gain, DL gain, RF ON/OFF, intermediate filters characteristics) and alarms can be supervised (amplifiers status, PA status, power supply status, battery backup status, temperature).   Manual gain control: Uplink and Downlink gain levels can be adjusted to meet system planning requirements. Both chains (UL and DL) can be adjusted independent, digitally, in 1dB steps. This gain control can be done locally via tac switches, via RS232 (OMS) or can be done remote via wireless connection (OMS). Gain values are shown via built-in digital displays, for an easy and fast reading.   Automatic Gain Control (AGC): Repeaters are equipped with Automatic Gain Control (AGC) that acts in both Uplink and Downlink chains independent. The presence of an AGC allows a maximum power operation with low intermodulation generation, and provides a lineal operation that ensures a high quality signals amplification.   Weatherproof enclosure: Units are equipped with IP65 enclosures, to allow a simple and easy installation procedure since no special weather protection are required. Standard fixing method is wall mounting, Pole mounting brackets are available as optional.   RF Specifications

Item			Specification For Cable-Access Band-selective FSR(CB-FSR)		Remark
			Up-Link	Down-Link
Work Frequency range			885-915mhz	930-960mhz	For GSM Device
			1710-1785mhz	1805-1880mhz	For DCS Device
Transmitting frequency			150-250mhz Or Customized	150-250mhz Or Customized
Passband BW			0.2-30Mhz(Customized)		For GSM Device
			0.2-75Mhz(Customized)		For DCS Device
Output Power		Donor Unit	-10-0 dBm	30-40 dBm	(Customized)
		Remote Unit	30-40 dBm	30-43 dBm
Nominal Gain		Donor Unit	45-55dB	45-55dB	(Customized)
		Remote Unit	75-105dB	75-108dB
Pass Band Ripple			≤3dB		For GSM Device
			≤6dB		For DCS Device
Gain Adjust Rang			0-30dB in 1 dB steps
AGC Rang			0-30dB
Max. ALC level			≥25dB
Intermodulation attenuation )			≤-45dBc
Spurious emission	9kHz-1GHz		≤-36dBm
	1GHz-12.75GHz		≤-30dBm
Noise Figure.			≤5dB(at maximum output power)
Group delay			≤6us
VSWR			≤1.5
RF Connectors			N – female
Impedance			50 Ohms

   

Item			Specification For Wireless -Access Channel-selective FSR(WC-FSR)		Remark
			Up-Link	Down-Link
Work Frequency range			885-915mhz	930-960mhz	For GSM Device
			1710-1785mhz	1805-1880mhz	For DCS Device
Transmitting frequency			150-250mhz Or Customized	150-250mhz Or Customized
Passband BW			0.2-30Mhz(Customized)		For GSM Device
			0.2-75Mhz(Customized)		For DCS Device
Number of channels			1-8
Channel programming			In 200KHz Channel spacing
Output Power		Donor Unit	27-37 dBm	30-40 dBm	(Customized)
		Remote Unit	30-40 dBm	30-43 dBm
Nominal Gain		Donor Unit	60-85dB	60-85dB	(Customized)
		Remote Unit	75-105dB	75-108dB
Pass Band Ripple			≤3dB		For GSM Device
			≤6dB		For DCS Device
Gain Adjust Rang			0-30dB in 1 dB steps
AGC Rang			0-30dB
Max. ALC level			≥25dB
Intermodulation attenuation )			≤-45dBc
Spurious emission	9kHz-1GHz		≤-36dBm
	1GHz-12.75GHz		≤-30dBm
Noise Figure.			≤5dB(at maximum output power)
Group delay			≤16us
VSWR			≤1.5
RF Connectors			N – female
Impedance			50 Ohms

    Supervising Specifications

Self diagnostic platform	Microprocessor based
Alarms	Yes, amplifiers status, power amplifiers status, power supply failure, battery backup failure, temperature, AGC, RF overload, poor antenna isolation.
Local management and supervising	Built-in gain adjustment interface and alarms/status LEDs, PC access via RS-232 (OMS)
Remote management and supervising	Remote access via wireless GSM SMS modem OR GPRS Modem OR Ethernet, option RC (OMS)

  Electrical & Mechanical Specifications

AC Supply		110/220 VAC
Housing		IP65
Temp rang		-30 to +60 ℃
Size, W×D×H, in mm	A Class	660×408×212
	B Class	600×450×260
Weight	A Class	40Kgs(Probably, different models will be small differences)
	B Class	38Kgs(Probably, different models will be small differences)
Mounting		Wall mounting as standard, Option PK for pole mounting.

  Typical Application: The Villages’ Communication Project is mainly aim at the coverage of remote villages. Technology Analysis: 1,Analysis of Enclave System Relay and Coverage Ability     Enclave System uses VHF band of 150MHz to 230MHz, which compare to GSM900 or GSM1800 band, the radio wave diffraction much stronger, transmission loss much less, and more conformable for signal long distance transmission and coverage under special landform. 1.1   Diffraction Analysis: The Electromagnetic Wave has the characteristic similar to optic wave, so for the large margin of power, even there has barrier in the way, it can also communicate via reflection wave or antenna side lobe in short distance transmission. But in long distance transmission, the way between transceiver antennae must be “line of sight out of barrier”.   The calculation formula of Fresnel radius is as follow: R=0.5*(λ*D)*0.5  — λ is wavelength,λ=3×108 /f(meter) —     D is the distance between two antennae.   Therefore, at mountainous area thus non-vision distancepropagationenvironment with many obstacles, the Enclave System has stronger ability to conquer landform environment and transmit. 1.2   Space Transmission Loss Analysis The signal transmission loss in free space is nearly relevant to signal frequency, the higher frequency, the greater unit distance loss. The signal loss in free space can be calculated by the formula as follow: PL(dB) =32.45 + 20lgf + 20lgd If the transmission distance is the same, the attenuation that 900MHz signal beyond 150MHz will be: 20(lg900-lg150) = 15.56dB The attenuation beyond 230MHz will be: 20(lg900-lg230) = 11.85dB Thereby, the loss of 900MHz signal in free space is 32 multiples of 150MHz signal, and 16 multiples of 150MHz signal. Other things being equal, the 150MHz/230MHz signal can transmit longer distance.