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.
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 |
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% |
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% |
Operating Temperature | -30˚C to +55˚C |
Storage Temperature | -40°C to +70°C |
Humidity | 95% Max at +40˚C non-condensing |