Helios® Frequency Shifting Repeaters (FSR) system is designed to solve problems of weak mobile signal, which can expand more coverage than RF repeaters and reduce investment for the areas where fiber optic or dedicated cable is not allowed.
As per the method of receiving BTS signal by the Donor Unit, two types of FSR are available:
1. Cable-Access FSR: To receive BTS signal via a direct coupler closed to the BTS (Recommended);
2. Wireless-Access FSR: The receive BTS signal via a Donor Antenna (applicable when no line of sight can be viewed between the Donor Unit and Remote Unit as the Donor Unit is installed on the BTS tower).
And both types of FSR can be sorted into 2 sub-categories as per the availability of link frequency:
3. In-band FSR: The link frequency is within the working band of BTS;
4. Out-of-Band FSR: The link frequency is out of the working band of BTS.

Features
1. Aluminum-alloy casing with IP65 protection
2. Compact design, cool system without fan
3. Best solution to eliminate mutual interference due to sharing the same frequency
4. ALC and AGC to ensure stable operation
5. Easy to install on wall or pole
6. Highly selective channel selector can process 1 or 2 or 4 or 6 or 8 channels simultaneously
7. Max transmission distance between Donor Unit and Remote Unit is 20KM

8. Adopting filter with highly selectivity and low insertion loss eliminates interference between uplink and downlink
9.2 RS-232 or RJ45 ports provide links to laptop for local test or to built-in wireless modem for communication with the NMS
10. Built-in wireless modem (Option) for remote monitoring by SMS, GPRS or TCP/IP.
11. Details repeater parameters and status can be monitoring by built-in web interface, such as RSSI, temperature, output power level, gain, ATT, return loss, VSWR etc.
12. Support upgrading firmware remotely by GPRS.
13. High gain linear power amplifier technique with reliable performance
14. Eliminate isolation requirement in antenna installation
15. Easy to choose installation site

Technical Specifications
Frequency Range(Customized)  
Uplink: 450-457.5MHz/824-849MHz/1880-1890MHz
Downlink: 460-467.5MHz/869-894MHz/1960-1970MHz
Transmission Frequency: Various frequency (Up to 15GHz) is available upon request
Transmission Distance: Max 20KM (From Donor Unit to Remote Unit)
Frequency Error: Max 0.05ppm

Downlink Input Level:  
Wireless Access Type: Min -70dBm Direct Couple Type: Min -10dBm
Output Power:
Uplink:
Donor Unit: Wireless Access Type: Min 30dBm Direct Couple Type: Min 0dBm
Remote Unit: Min 33dBm-37dBm (2-5W)  
Downlink:
Donor Unit: Min 30dBm-40dBm (1W-10W)  
Remote Unit: Min 37dBm-43dBm (5W-20W)
Working Bandwidth: Various bandwidth is available upon request
Configurable Channels (Optional): 1, 2, 4, 6, 8 for option

Gain:
Donor Unit: Wireless Access Type: Min. 85dB Cable Access Type: Min. 45dB
Remote Unit: Min 90dB  
AGC Control Range: Min 40dB (+/-2dB)
Gain Control Range: 31dB (1dB Step)
VSWR: < 1.5
Ripple in Band: Max +/- 1.5dB
I/O Impedance: 50 ohm
Noise Figure: Max 5dB
Group Time Delay: Max 5µ S
Temperature Range: -25 degree Celsius to +55 degree Celsius

Relative Humidity: Max 95%
M. T. B. F: Min. 100000 hrs
Power Supply: DC 48V / AC220V (+/-15%), 50Hz
UPS Backup Power Supply (Optional): 6 hours / 8 hours
NMS Monitor Function: Real-time alarm for Door Status, Temperature, Power Supply, VSWR, Output Power, Gain, Uplink ATT, Downlink ATT and etc.
Remote Control Module (Optional): RS232 or RJ45 + Wireless Modem + Li-ion Chargeable Battery
Dimension:
Donor Unit: 460mm x 405mm x 180mm Remote Unit: 605mm x 445mm x 225mm
Weight:
Donor Unit: 20Kgs Remote Unit: 34Kgs