MISSION CRITICAL RF PRODUCTS
VHF
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A VHF BDA (bi-directional amplifier) extends the coverage of VHF land mobile radio networks into buildings, tunnels and outdoor areas with weak signal. It amplifies the downlink from the radio site towards users and the uplink from portable radios back to the network. VHF is widely used for analog and digital LMR, including DMR and P25 systems.
According to their datasheets, the channel selective BDAs can feed a leaky feeder or a distributed antenna system for indoor coverage.
A band selective BDA is simple and amplifies all channels within its passband. However, it also amplifies other users in that band. A channel selective BDA, by contrast, amplifies only the programmed channels, which protects neighbouring networks and keeps output power focused on the channels that matter.
In small and medium buildings, a VHF BDA with a passive antenna network is often enough. For long tunnels, large sites or several buildings, a BDA can feed a fiber optic system, with remote units close to the coverage areas. In-line boosters then compensate for losses along extended coaxial or leaky feeder runs.
Explore other bands in our TETRA and DMR coverage solutions, including 400 MHz TETRA and DMR repeaters, or see the public safety fiber DAS. Our in-building coverage planning guide explains the full process.
Yes. A BDA retransmits licensed frequencies, so coordination with the licensee and local authorities is required.
A channel selective BDA can be programmed for the channels of several users, subject to approval from each licensee.
Contact EMTS with your VHF channel list for a recommendation.