SMARTTune® 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 LERD’s
- AGC Amplifier Fitted
The Head End Combines Surface And Under-ground Radio Channels To Form An Intergrated Radio Network For Mine Communications
DESCRIPTION:
The SMARTTune® 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.
With the addition of the SMARTTune® AGC amplifier, the gain of each arterial is held at a stable level. The Head End also has ability to feed a surface 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 |
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