30dBm VHF Digital Channel Selective Bi-Directional Amplifier
The EMTS Telecom Services channel selective VHF BDA provides an excellent solution to the feed VHF Fiber Optic DAS. Using the BDA, the LMR operator can easily expand a base station’s service area by filling in coverage holes caused by terrain, buildings, or tunnels. The BDA amplifies the signals from LMR BTS using a downlink amplifier; the signals from the handset coming from the master unit are transmitted to the BTS using an uplink amplifier. The signals from the BTS are selected via the digital engine and the signals transmitted from the BDA to the BTS are filtered via the digital engine. The donor antenna transmits signals from mobile phones and receives signals from the BTS. Easy installation, lightweight design and very friendly GUI makes the EMTS BDA easy to use and install. The EMTS BDA is a cost-effective and practical solution for extending signal coverage and includes a wireless modem to support remote and monitoring NMS.
Networks. Based on advanced technologies EMTS proven, indoor and outdoor, solutions solve a wide range of Networks. Electrical Specifications Downlink Uplink Frequency Ranges 147-174MHz 147-174MHz
Channel Operational Bandwidth 25KHz Digital channels Up to 8 programmable in same unit Gain 80 dB±2 dB Gain Adjustment Range 30 dB in 1 dB step Pass Band Ripple ≤±1.5 dB Output Power 30dBm 20dBm AGC Range 20dB VSWR 2:1 Noise Figure@ Max Gain 5dB Spurious ≤-36dBm (9KHz to 1GHz) ≤-30dBm(1GHz to 12.5GHz) Group Delay 25μs External connection Connector N-F / 50ohm Alarm Detection HPA, LNA, TEMP, PSU, Digital IF module, Door Local Alarm Option; NMS interface PSU, HPA, Local LNA, Digital LED display, IF Module, Dry Contacts; Temp,local RS232 Door; Remote monitoring control gain of Uplink and Downlink
Power Supply 110 to 220VAC ±15％ 50-60Hz / 60 Watts
Environmental Operating Temperature Range -20 to +55 °C
Cooling Convection Environmental Sealing IP65 Operating Humidity Up to 95% (non-condensing) Complies with EN 301 489-18, ETSI TS 101 789-1, EN 60 950 Standards 450×400×295 mm Weight 30Kg
Key Features
- Off-the-air coupling for VHF fiber DAS system feeds the master unit with the selected channels
- Utilizes advanced digital IF technology; Channel can be controlled locally or via NMS
- Intelligent design, with built-in ALC function, provides auto amplitude compensation
- Designed to support Mission Critical Services for VHF system at 147-174 MHz band
- Designed to expand signal coverage or fill the signal blind area where VHF signals are weak or unavailable; the channel-selective function can amplify only the signals transmitted
- Stable and improved signal transmission quality
- The off the Air BDA feed master units, which support 4 to 8 Remote Units
- Aluminum casing with IP66 protection has high resistance to dust, water and corrosion
- WiFi or RJ45 port provides a link to a notebook for local supervision or to the built-in wireless modem to communicate with the NMS (Network Management System)
