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VHF Bi-Directional Amplifier


The Becker VHF Bi-Directional Amplifier is typically used in Mining, Shipping, Tunnelling, Motorway and In-Building radiating cable systems to compensate for Leaky Feeder Cable longitudinal losses in both directions simultaneously. Becker BDA specifications are optimally suited to maximize these performance criteria. The BDA serves to maintain the strength of RF signal levels along the Leaky Feeder coaxial cable. The amplifier is unique in that it offers the lowest possible noise contribution to an already weak RF carrier when operating in collocation with a strong carrier. The connectors of the inline amplifiers have been designed for ease of connection making installation and repair as convenient as possible. The Power Source required from the Leaky Feeder cable is 5V to 26Vdc. The most important performance criteria of a BDA are: Channel capacity – Number of simultaneous voice and data Channel quality (clear voice channels, data channel, integrity). Channel isolation (Freedom from intermodulation distortion). Distance achievable away from the cable. Reliability and Mean Time Between Failure channels.
Becker BDA specifications are optimally suited to maximize these performance criteria.

Description Spec / Range / Type
Frequency Range Voice / Data Handheld to Base 171MHz – 174MHz
(Up-link) Base to Handheld 152MHz – 158MHz (Down-link)
Channel Capacity 32 Channels Up
32 Channels Down
Down Link Open Loop Gain 20dB typical
Gain Response Ripple 1dB maximum
Downlink Nominal Output Power Setpoint 10dB
Typical LED LOW Threshold -10dBm
Typical LED GOOD Threshold – 7dBm
Typical LED HIGH Threshold – 5dBm
Typical LED HIGH HIGH Threshold – 2dBm
Up Link Open Loop Gain 21dB typical
Gain Response Ripple 1dB maximum
Uplink Nominal Output Power Setpoint 10dBm
Typical AGC LED Threshold -12dBm
Operating Voltage 5V to 26Vdc
Current Requirement @ 12VDC 250mA maximum Approved Explosion
Protection rating (ia) Ex ia I/IIC T4 (Optional)
Inspection Authority Certificate (ia) MS-XPL/03475A X (Optional)
Through current capacity 3.0A max
CLC 3dB Attenuated Gain (Up & Down) 17dB typical
CLC 6dB Attenuated Gain (Up & Down) 14dB typical
CLC 9dB Attenuated Gain (Up & Down) 11dB typical

Typical Response Curve



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