VHF Head End Combiner

KEY FEATURES:

• 8/16 Transmit & Receive Channels
• 4 Arterial Leaky Feeder Interfaces
• Individual Arterial Current Meters
• Metered 12, 24 or 48 V Supplies
• Diagnostics and Alarm LED's
• SMARTTune (ST) Version available

The Head End Combines Surface And Under-ground Radio Channels To Form An Integrated Radio Network For Mine Communications DESCRIPTION: The VHF Head End Combiner is the core of the Sigma Leaky Feeder system. The unit combines multiple radio channels on the surface and underground into one single voice and data network. With the option of either 8 or 16 repeater channels, surface communications can be linked into the underground leaky feeder system via one or more of the arterial cables within the mine shaft, as well as underground communication, transferred to the surface in the same manner. The Head End also has the ability to feed a surface antenna or a Sigma Area Coverage Amplifier to provide enhanced local coverage above ground. An external power supply is required in order to power the first few amplifiers connected to each arterial underground, thereafter underground power supplies are required for further amplifiers in the chain. There are four Head End variants available:

3U 19 inch rack options	4U 19 inch Rack options
8 Channel VHF 8	16 Channel VHF 16
8 Channel Smart Tune VHF 8ST	16 Channel SmartTune VHF 16ST

SPECIFICATION:

Combiner Channels:	Standard 8 (Model VHF 8) & Optional 16 (VHF 16)
Input Supply Voltage:	12V, 24V and an optional 48V versions
Arterial Current:	3A per Arterial Feed (Four Feeds Total)
Transmit Frequency:	150-160 Mhz
Receive Bandwidth:	165-175Mhz
Bandwidth:	2.5 Mhz (for both transmit and receive)
Input RF Power:	3W PEP (Maximum)
Port - Port Isolation:	Better than -20dB
Input Impedance:	50/75 Ohms
Output Impedance:	50/75 Ohms