A VHF Distributed Antenna System (DAS) is a specialized communication infrastructure designed to enhance and extend radio frequency coverage in the VHF range. VHF frequencies typically range from 136 to 174 MHz, and VHF DAS plays a crucial role in public safety communication, particularly for first responders and emergency services operating in large buildings, tunnels, or areas with limited coverage. VHF DAS consists of two-stage system, that is:
Master Optical Unit (MOU):
| Frequency Range, MHz | : | 146-163 |
| Maximum Input Power (Downlink), dBm | : | ≤ 10 |
| VSWR | : | <1.5 |
| Number of Optical Output Ports | : | 8 |
| Impedance, Ω | : | 50 |
| Power Consumption, Watt | : | ≤150 |
| Mounting | : | Rack Mounted |
Remote Optical Unit (ROU):
| Frequency Range, MHz | : | 146-163 |
| Gain, dB | : | 40±3 |
| DL output power, dBm | : | 33 |
| VSWR | : | <1.5 |
| Impedance, Ω | : | 50 |
| Power Consumption, Watt | : | ≤150 |
| Mounting | : | Wall Mount |