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Caltta PR900 U1 DMR analog / digital repeater

Model: PR900U1
Nyíregyháza (HU): Back Order
Budapest (HU): Back Order
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2,780.32 EUR (2,336.40 EUR + VAT)


The Caltta PR900 DMR analog / digital repeater has a slim and compact design, yet high performance and efficiency, it is easy to operate and configure. 

Caltta PR900 DMR analogue / digital repeater features:

  • Compact 1U Design 
  • Smart Digital-Analog Auto Detection 
  • Control Panel with 2.0 ”LCD Screen and Multiple Function Buttons 
  • IP Connection, Multiple Networking Solutions for Various Scenarios 
  • Higher Security and Reliability 
  • Dispatcher Connectivity 
  • Support AIS Protocol to Interwork with the third-party Vendors' Dispatcher 
  • Accessory Expansion Facility 
  • With 3 years manufacturer's warranty

Digital Voice with Better Audio Quality 
Digital voice processing reduces the impact of environmental noise on voice quality, allowing users to make clearer calls, and can be used for complicated work scenarios with constant changes. 

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. 

High Security and Reliability
Professional encryption algorithm 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 end user's life safety to the utmost extent. 

Standard DMR Products Embrace Interconnection 
Caltta is a member of DMR Association, and our PR900 repeater is fully compliant with DMR standard, which can interconnect with any other DMR system and radios that comply with DMR standard. 

Analog Compatible Design 
Smart digital-analog automatic detection mechanism ensures legacy analog radios can still be used under our PR900, to guarantee customer's investment to the greatest extent.

Functions of the Caltta PR900 DMR analogue / digital repeater:

Analog functions:

  • Repeat 
  • TOT: Time out timer 
  • Pre-emphasis: In analog channel, pre-emphasis and de-emphasis feature can be enabled. When it is enabled, the analog channel supports pre-emphasis on the transmitter and de-emphasis on the receiver to improve audio clarity. 
  • Squelch 

Digital functions:

  • Repeat 
  • TOT: Time out timer 
  • AIS protocol: This universal protocol allows total control of repeater by third side apk developers via backside connector of repeater. For example, some dispatcher’s manufacturers are doing their software adaptation for our PR900 using AIS. 
  • Access management 
  • IP multi-sites: You can connect many repeaters in different locations in one system via IP. 
  • ECS 
  • Simulcast: DMR conventional (Tier II) Simulcast system is mainly used in application scenarios where users are widely distributed, and multiple repeaters are required to form the network coverage, but the number of available frequencies for customers is limited. The system comprises multiple IP interconnected repeaters, but all repeaters in the system work at the same transmit and receive frequency, thus saving the frequency resource while providing wide coverage. 
  • Active Link: Wide Coverage with Wireless Link. Wide coverage solution based on back-to-back wireless link. Suitable for connecting multiple separate fixed facilities in mountainous area, forest and river where there is no IP link. Radios can roam and communicate seamlessly across sites. 
  • Single-frequency Repeater Mode: Repeater receives audio on slot 1 of a frequency and transmits it on same frequency but in slot 2. So users can talk directly in DMO mode if distance is close and via repeater if distance is fare. Just 1 single frequency is used. 
  • Enhanced Conventional System (ECS): Cost-effective Coverage with Dynamic Channel Allocation. Up to 8 repeaters stacked as one site with 16 channels as one site, up to 32 sites can be supported over IP link. No network controller required, suitable for high traffic with multiple facilities. Load balancing to avoid traffic congestion or single repeater failure. 

Other functios: 

  • Mix channel 
  • Write & read password 
  • RF power 1-50W 
  • Manage repeater via IP 
  • Upgrade via IP 
  • LCD display status and alarm information 
  • Email receiving alert notification 
  • Remote monitoring/managing software for remote access to the repeaters through internet

Blog posts:

Caltta PR900 repeater parameters
Digital Protocol ETSI TS 102 361-1,-2,-3
Frequency UHF1 400-470MHz or VHF:136-174MHz
Channel Capacity 1024
Channel Spacing 12.5KHz/25KHz
Max Duty Cycle 100%
Operating Voltage AC100 - 240 V @ 50 / 60 Hz DC13.6 V +-15%
Backup Battery Support
Size ( W × H × D ) 436mm × 44.5mm × 366.4mm
Weight 8.5 Kg
Frequency Stability +- 0.5 ppm
Screen 2.0" TFT LCD, 320 × 240
Analog Sensitivity 0.22 μV (12 dB SINAD)
Digital Sensitivity 0.22 μV (5% BER)
Intermodulation 75 dB (TIA603D), 70 dB (ETSI)
Adjacent Channel Selectivity 65dB@12.5 KHz/70dB@25 KHz (TIA-603D); 65dB@12.5 KHz/70dB@25 KHz (ETSI)
Spurious Response Rejection 80 dB (TIA603D); 80 dB (ETSI)
Blocking or Desensitization 90 dB (TIA603D); 90 dB (ETSI)
FM Hum and Noise -40 dB@12.5KHz / -45 dB@25KHz
Audio Distortion ≤ 3% ( Typical )
Audio Response + 1dB ~ - 3 dB
Conducted Spurious Emission - 57 dBm
Low Power Output 1W
High Power Output 50W
FM Modulation 12.5KHz:11K0F3E , 25KHz:16K0F3E
4FSK Digital Modulation 12.5KHz Data:7K60FXD; 12.5KHz Voice & Data:07K60FXE
Conducted/Radiated Spurious Emission -36dBm@≤1GHz , -30dBm@>1GHz
Max deviation +-2.5KHz @12.5KHz / +-5.0KHz @25KHz
Adjacent Channel Power -60dB@12.5KHz , -70dB@25KHz
FM Hum and Noise -40dB@12.5KHz, - 45dB@25KHz
Operating Temperature -30 ˘C ~ + 60˘C
Storage Temperature -40 ˘C ~ + 85 ˘ C


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