VHF Products

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The Power Supply consists of a Mains to DC power converter/charger and a heavy duty standby battery. The unit has been designed to supply the requirements of the Sigma range of ...

The VHF Area Coverage Amplifier provides a wide area coverage solution to above ground communication extensions of the existing Leaky Feeder system. The provision of increased RF ...

The Double Branch Coupler is a passive signal splitter that is used to branch of the main Leaky Feeder arterial to link into a side tunnel. The Double Branch Coupler is configured ...

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 ...

The Line Splice is a 75 Ohm impedance line splice designed for joining 75 Ohm Leaky Feeder cable with minimal loss and excellent impedance matching. No components are used in the ...

The VHF Line Termination Unit is a 75 Ohm impedance unit that terminates the Leakey Feeder in a matched impedance unit. The impedance match is AC coupled so there is no DC power ...

The VHF Mini Line Amplifier VMLAD from Sigma is the industry standard VHF Amplifier for Leaky Feeder Systems. It has been used for many years by hundreds of customers world-wide. ...

The Power Coupler is a 75 Ohm VHF/UHF Power Coupler is designed to allow for the coupling of DC power into the leaky feeder cable to power the bi-directional amplifiers in the ...

The Refuge Bay Radio was developed to be utilized in areas allocated as places of refuge within the mine. The Refuge Bay Radio allows communication on a pre-set frequency into the ...

The Single Branch Coupler is a passive signal splitter that is used to branch of the main Leaky Feeder arterial to link into a side tunnel. The Single Branch Coupler is configured ...

The VST Stopes Antenna is an antenna designed to be fitted in place of the line termination normally fitted at the end of a Leaky Feeder cable. The Stopes Antenna will increase ...

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