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DR-25 line of Digital Repeaters

Repeaters are supplied in three modifications for three most popular digital standards - dPMR Mode 2, DMR Tier II and APCO 25 Phase I Conventional (labelled as DR-25-dPMR, DR-25-DMR, DR-25-APCO).

All repeaters now (as of Fall 2016) have the following common features:
• compatibility with all mentioned digital standard two-way radios, including practically all cheap Chinese manufacturers;
• RF power is 25W, UHF 430-470 MHz (VHF band production plans are for the end of 2016; 50W - beginning of 2017);
• mixed operation mode and retransmission of call data (i.e. repeater automatically determines the type of signal - analog or digital, whether the signal has
subcarrier or group/individual digital code - and relays the signal to air locally and over IP-network);
• two versions – simple single-site #1 - if the customer is satisfied with a local repeater solution, and a full IP-version #5 capable of measuring RSSI signal level и BER with a possibility of building largescale systems and connecting to all analog “Radiokupol” dispatcher components (requires a voice digital converter – DVC-xxx - of the relevant standard);
• simultaneous connection of the repeater to 10 IP-devices of the Radiokupol+ system;
• possibility of upgrading to another digital standard using a special software key, so that the upgrade can be done on-site.

 DR25 EN


DR-25 line of Digital Repeaters General specifications
Specifications Nominal value
Operation frequency range: 430 – 470 MHz
Transmitter output power: 5 W, 10 W, 25 W.
Frequency stability: 2 x10-6
Audio bandpass flatness +within +1 to -4 dB: 0 – 3400 Hz
Modulation distortion: Not more than 2% at 50% deviation
Spurious radiation suppression: over 80 dB
Duty cycle: 50%
RF Rise Time: Less than 50 ms
Current consumption: up to 8 А
Operation frequency range: 430 – 470 МГц
Sensitivity: -117dBm (12dB SINAD or 5% BER)
Selectivity: over 80 dB @ 25kHz; over 70 dB @ 12.5kHz;
Audio bandpass flatness within +1 to -4 dB: 5 – 3400 Hz
Audio distortions: Not more than 1% at 50% deviation
Receiver type: Double Conversion Superheterodyne: IF1 - 45 MHz, IF2 - 455 kHz
Network interface
Interface type: 10/100BASE-T Ethernet, IEEE 802.3, 10 or 100 Mbps; RJ-45 connector
Protocols: ARP, IP, TCP, UDP, IP, HTTP
Audio codecs: g.711 µ/a Law, GSM 6.10 FR, Speex
Audio delay in analog mode g.711 – 150 ms, GSM – 300 ms, Speex – 100 ms
Audio delay in digital mode dPMR - 320 ms, DMR – 100 ms, APCO – 160 ms