Caltta Technologies Co., Ltd.
Caltta Technologies Co., Ltd.
caltta dmr digital repeater pr900
caltta dmr digital repeater pr900 2
caltta dmr digital repeater pr900 1

Caltta PR900 Digital Repeater

Caltta PR900 is a professional digital repeater with powerful functions and convenient configuration, meeting customers' higher requirements. It is a key part of different PMR solutions for different scenarios. 


Features of PR900 Digital Repeater

  • Ultra Slim Design

  • PR900 adopts 1U design, making the height half of conventional repeaters and saving space when installing.

  • Easy Operation for Users

  • PR900 adopts a 2.0-inch HD color screen, making it more convenient for users to review information and operate.

  • Better Audio Quality

  • Digital voice processing reduces the impact of environmental noise on voice quality, making the call voice clearer. Thus, it is suitable for complicated and noisy work scenarios with constant changes.

  • Digital-analog Compatible

  • Smart digital-analog automatic detection mechanism ensures legacy analog radios can still be used under our PR900, to guarantee customers' historical investment to the greatest extent.

  • Flexible Networking

  • PR900 analogue repeater supports flexible networking based on diversified scenarios: IP connection extends coverage; simulcast fulfills large coverage with fixed frequency; active link offers wide coverage; ECS(Enhanced Conventional System) realizes dynamic channel allocation.

  • High Security and Reliability

  • Professional encryption algorithms as well as service protection mechanisms such as authentication and remote stun, help to ensure the data security and reliability of the DMR system and the end user's life safety to the utmost extent.

  • Rich Interfaces

  • PR900 supports the access of the remote microphone and provides a customization interface to realize more third-party extension services.

  • High Spectrum and Power Efficiency

  • With DMR two-slot TDMA technologies, PR900 allows a single carrier with a bandwidth of 12.5 kHz to support two independent calls, with each time slot occupying a bandwidth of 6.25 kHz, which reduces transmission time in half and saves battery power consumption by 40%, effectively prolonging the standby time of DMR radios.

  • DMR Standard 

  • As Caltta is a member of the DMR Association, the PR900 repeater is fully compliant with DMR standard and can interconnect with any other DMR system and radios that comply with DMR standard.

  • Rich Services

  • Besides basic PTT services, PR900 also supports text messages, status messages, map-based location services, and call recording to enrich the user experience.

  • Flexible Customization

  • Supports customization according to customer needs.

  • Fulfill customer expectations using personalization.

Specifications of PR900 Digital Repeater


Digital Protocol

ETSI TS 102 361-1, -2, -3


UHF1: 400-470MHz    VHF: 136-174MHz

Channel Capacity


Channel Spacing


Max Duty Cycle


Operating Voltage

AC100-240V @50/60Hz   DC13.6V±15%

Backup Power Supply


Size (H*W*D)

436×44.5×366.4mm (Standard 19-inch 1U height frame)


2.0-inch HD LCD, 320×240, 10 status LEDs




Sensitivity(Analog Typical)

0.14uV(12dB SINAD)

Sensitivity(Digital Typical)

0.14uV(5% BER)

Frequency Stability±0.5ppm (Max)

Adjacent Channel Selectivity

65dB@12.5KHz/75 dB@25KHz (TIA603D)

65dB@12.5KHz/75 dB@25KHz (ETSI)


75dB (TIA603D)

70dB (ETSI)

Spurious Rejection

80dB (TIA603D)

80dB (ETSI)

Blocking or Desensitization

98dB (TIA603D)

95dB (ETSI)

Hum and Noise

40dB (Min)

Audio Distortion @ Rated Audio

≤3% (Max)

Audio Response


Conducted Spurious Emission

-57dBm (TIA603D)


Frequency Stability


Power Output

1W - 50W (UHF1/VHF)

FM Modulation

12.5KHz: 11K0F3E / 25KHz: 16K0F3E

4FSK Digital Modulation

12.5KHz Data Only: 7K60FXD

12.5KHz Voice and Data: 7K60FXE

Conducted/Radiated Emission

-36dBm≤1GHz; -30dBm>1GHz

Modulation Limiting

±2.5KHz @12.5KHz/±5.0KHz @25KHz

FM Hum and Noise

40dB (Min)

Adjacent Channel Power

60dB @12.5KHz/70 dB @25KHz

Audio Distortion @ Rated Audio

≤3% (Max)

Audio Response



Operating Temperature

-30℃ ~ +60℃

Storage Temperature

-40℃ ~ +85℃

Accessories of PR900 Digital Repeater

Power Line(AC)
Power Line(AC)
Power Line(DC)
Power Line(DC)
Programming Cable
Programming Cable

Document Download of PR900 Digital Repeater

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