What are the characteristics of DMR digital intercom module? How to choose?

By sdga:

The DMR828S is a cost-effective 2W full-featured digital radio module developed by NiceRF. It is compatible with commonly used analog radios on the market and features DMR Tier II digital radio functionality, with a built-in Moto AMBE++ vocoder. The module integrates microcontrollers, digital radio chips, RF power amplifiers, audio amplifiers, and other circuits internally. Customers only need to connect external power sources, speakers, and other devices to operate it as a small digital radio with 16 adjustable frequency channels. Its ultra-compact size also facilitates quick and easy integration into various handheld devices, enhancing the overall performance of end products.


Supported frequency bands and their ranges

Frequency bands and their ranges:

UHF band: 400-470 MHz

VHF band: 134-174 MHz

350 band: 320-400 MHz

Note: Choose one of the above frequency bands.

High Power Mode, Low Power Mode, Long Distance Transmission Mode for Digital Radio Modules

High Power Mode: In high power mode, the module can output 2W of power. In this mode, the transmission distance typically reaches several kilometers or even further. However, the specific transmission distance is influenced by factors such as terrain, buildings, and environmental interference.


Low Power Mode: In low power mode, the output power is lower, typically around 0.5W. Despite the lower power, under appropriate conditions (such as flat terrain or open areas without obstacles), it can still achieve transmission distances of several kilometers.

Transmission Distance: The transmission distance is influenced by various factors, including operating frequency, antenna gain, and environmental conditions. In open geographical environments, using high power mode can achieve longer transmission distances. However, in urban or mountainous areas with complex environments, relay stations or techniques such as using high-gain antennas may be needed to increase the transmission distance.

Dual timeslot communication, with the ability to communicate with repeater stations

Dual Timeslot Communication: The DMR828S digital radio module supports dual timeslot communication, meaning that two independent communication connections can occur simultaneously on the same channel. This allows users to engage in bidirectional communication on the same frequency, enhancing spectrum utilization and communication efficiency.

Repeater Station Communication: The DMR828S digital radio module can communicate with repeater stations. Repeater stations are typically located at elevated positions, providing broader communication coverage and better signal transmission quality. By communicating with repeater stations, the DMR828S can achieve communication over longer distances and maintain higher communication quality even in complex environments.

Full-Featured Digital Radio Module: Technology and Communication Methods

Digital radios utilize digital modulation and demodulation technology, employing digital signals for communication. Compared to analog radios, digital radios exhibit greater robustness during signal transmission, better resistance to interference and noise, and provide higher-quality communication services. Digital communication also allows for efficient data compression, enhancing spectrum utilization.

Communication Quality and Voice Clarity:

Analog Radio Modules: Communication quality with analog radio modules is significantly affected by environmental interference. Factors such as buildings, terrain, and weather may lead to signal attenuation, noise interference, affecting communication reliability and clarity.

Digital Radio Modules: Digital radio modules typically offer better communication quality as they use digital signal transmission and are often equipped with error correction and compensation technologies, which can overcome signal attenuation and interference to some extent.

Voice Clarity:

Digital radio modules typically provide clearer audio as digital signals exhibit better interference resistance. Even in noisy or signal-attenuated environments, digital radios can deliver relatively clear, nearly distortion-free audio.

Functionality and Data Transmission:

Digital radio modules offer far richer functionality compared to analog radio modules. In addition to high-quality voice communication, digital radios support data transmission, enabling the transfer of text messages, images, videos, and other multimedia data. This flexibility makes digital radios more versatile in applications such as monitoring, remote command, and control.

Security and Encryption Technology:

Digital radios utilize advanced encryption technology to ensure communication security. The encryption capability of digital communication far surpasses that of analog communication, mitigating security threats such as eavesdropping and malicious attacks, making digital radios advantageous in fields requiring high confidentiality.

Overall, the combination of dual timeslot communication and repeater station communication in the DMR828S enables it to provide reliable communication services in various application scenarios, particularly suitable for situations requiring wide-area coverage or communication in complex environments, such as commercial, public safety, emergency rescue, outdoor activities, etc.

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Address:309-314, 3/F, Bldg A, Hongdu business building, Zone 43, Baoan Dist, Shenzhen, China