Multi-Protocol VHF 136-174MHz Optical DAS Coverage Solution

Modern communication environments are increasingly multi-agency and multi-protocol. A single shared site may host police on P25, transit security on TETRA, facility management on DMR, and commercial cellular on LTE—all operating within the VHF spectrum. Deploying separate coverage systems for each protocol is prohibitively expensive and operationally complex. Our Multi-Protocol VHF Optical DAS solves this by providing a single, unified signal distribution layer that transparently handles all major professional and cellular protocols within the 136-174MHz band.

Unlike protocol-specific repeaters that decode and re-encode signals, our system operates as a transparent RF pipe. The wideband linear amplifier and protocol-agnostic RF-to-optical conversion faithfully reproduce the original waveform regardless of modulation scheme, channel bandwidth, or protocol. This means the same DAS infrastructure supports TETRA's π/4 DQPSK, P25's C4FM, DMR's 4FSK, and LTE's OFDM simultaneously without reconfiguration. As your radio network evolves, your coverage layer remains constant—a genuinely future-proof investment.

• Protocol-agnostic RF-to-optical conversion supports all VHF modulation schemes
• Simultaneous operation with TETRA, P25, DMR, GSM, WCDMA, LTE, NR, and WiFi
• 25KHz adjustable bandwidth accommodates both narrowband and wideband channels
• No protocol-specific hardware modules required—single platform for all radio systems
• Future-proof design adapts to new radio standards without infrastructure changes
• Ideal for shared government and commercial sites with multi-agency radio systems

Located in Guangming District, Shenzhen, Shenzhen A T N J Communication is a professional RF manufacturer with 16 years of experience in R&D, production, manufacturing, sales, and technical services. Our main products include Digital LTE/NR series repeaters, SDR core boards, passive devices, Digital DAS systems, and technical solutions for Public and Private (VHF, Tetra) network base stations and wireless frequency modules.

We provide OEM and ODM services for various RF projects, including wireless repeaters, multi-frequency DAS systems, remote network management center OAM, and equipment provision for indoor and outdoor signal coverage projects.

Our digital repeaters now support 12 subbands simultaneously with local and remote control and monitoring capabilities. These products are supplied to signal operators and communication integrators worldwide, providing signal coverage solutions for residential areas, office buildings, supermarkets, basements, and rural areas.

We have successfully introduced mature digital band-selective repeaters to overseas mobile operator markets. Our product field extends to Public Safety and Low Altitude Economic construction applications, including Public and Private Network Digital Multi-subband Repeaters, wireless signal repeaters, Integrated Base Stations, civil countermeasures, and phased array radar technology.

Furthermore, we have realized Digital fiber multi-frequency, UHF, Tetra, VHF, and Microwave frequency shift repeaters. As technology progresses, we continue to develop easier-to-use, more functional, and intelligent RF products. We look forward to collaborating with you to create a brighter future together.