UltraComm TR-155 VHF Leaky Feeder Network-

MSHA and West Virginia Approved

Key Benefits

• Provides complete and reliable system radio coverage
• Mine safety and productivity shows remarkable increases
• Highest power VHF amplifier on the market.

Features

• Latest technology multi-channel amplifiers
• 8 channel systems available
• External LED status of RF power
• Fault monitoring system
• Leaky Feeder antenna compatible
• Voice Alert™ Stat-Alert™ compatible
• Compatible with the TRAM II™ mine production management system
• Compatible with MineAx "Bird Dog" tracking and tagging system
• Agile – interoperable with competitive systems.

Specifications

TR-155 Amplifier Specifications
Frequencies	152-159 MHz inbound 158-175 MHz outbound
Gain - 155 MHz	25 dB nominal
PO VHF	+18 dBm nominal
Current draw	60 milli-amps @ 13 VDC
Voltage	40 VDC Maximum/14 VDC IS
Noise Figure	4 dB
Spacing Calculations
Maximum recommended amplifier spacing	1100-1600 feet
Loss at max/min	25.5 dB / 20.5 dB
Typical loss @ 1600'	23 dB
Residual gain	2-5 dB
Propagation estimate at 1600 foot amplifier spacing
Peak power point	+18 dB
Radiating Cable Specifications
Attenuation @ 150 MHz	1.5 dB per 100 feet
Coupling loss @ 150 MHz	65 dB @ 20 feet
Loop resistance	2 Ohms/1000 feet
Impedance	75 ohms
Diameter	.510"
Jacket Type	PVC
Bend Radius	6" minimum

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