Repeater

The Repeater mainly works for extension of communication from one DMR Radio to another DMR Radio which are beyond the existing group of network. The Repeater has IP connectivity providing flexibility to connect to different network users / services via IP. The Repeaters also have high power RF circuitry along with Digital Logic to implement the Repeater functionality. The digital logic takes care of the connectivity where as the RF section takes care of the Range and sensitivity of RF signals. This repeater has RF output power of 50 W programmable. The digital section is FPGA / processor based solution where in all the logics are implemented for meeting appropriate slot timing for both transmission and receiption.

Specifications

General
Type DMR tier III VHF, UHF synthesized repeater
Frequency Range VHF 136-174 MHz , UHF 400-470 MHz , 800-890 MHz
TDMA Digital TDMA 2 – Slot
Operating Mode Dual standard (Digital & Analog)
Operating selection Fully automatic for Analog & Digital
Channel capacity 64 or better
Channel Spacing 12.5 / 25 kHz
Operating voltage 12 V DC, 230 V AC + 10 %, 50 Hz +1 %. Automatic switchover from AC to DC during mains failure.
Frequency Stability + / - 0.5 ppm
Interface 10 Interface USB connector, Microphone, Speaker (integrated), Tx (N female), Rx (BNC female), 2 x Ethernet, DB25 Accessory Connector, External Reference (BNC Female)
Antenna impedance 50 Ω
Duty cycle 100%
Weight Less than 15 kg
Display Indicator for transmit & receive
VSWR Better than 1.5
Protection Reverse polarity, Load VSWR Protection
Transmitter
RF Output Power 5 to 50 Watts (Programmable)
FM Emission 11KOF3E / 11KOF1E
Digital Modulation 4FSK
Modulation Limiting + 2.5 kHz at 12.5 kHz , Optional: +/-5 kHz at25 kHz
FM Hum & Noise -40 db or better
Adjacent channel power -60 dBc or better
Audio Response +1,-3 db
Audio Distortion less than 3%
Receiver
Sensitivity (Analog) 0.30 µV (for 12 dbSINAD)
Sensitivity (Digital) 0.30 µV at 5% BER or better
Image rejection 65 db or better
Adjacent Channel selectivity 60 db or better
Inter-modulation 70 db or better
Audio Distortion less than 3%
Environmental
Operating Temperature -30˚C to +55˚C
Storage Temperature -40°C to +70°C
Humidity 95% Max at +40˚C non-condensing