The Transmission System
The Transmission System, in its simplest form, consists of the following:
- An IBM compatible PC running Windows
- A proprietary Modulator Unit
- PEDCALL Software package
- VHF Leaky Feeder Headend
- Leaky Coax Antenna or Distributed Antenna
PEDCALL PC & Software - The Operator Interface
The Windows (95, 98, or NT) computer which is running PEDCALL controls the Transmission System. The PEDCALL software provides the interface from the operator to the system in a simple and efficient manner.
Modulator Unit
The Modulator Unit, as its name suggests, modulates the encoded information and produces a frequency shifted output signal. The Modulator provides the interface between the PC and the transmission system.
The Transmitters
The VHF Leaky Feeder system version requires high quality signal from a dedicated channel which is used to carry the encoded PED signal.
Antenna
This Leaky Feeder Version uses the existing leaky coax antenna network, or distributed antenna system, used for the two way voice and data transmissions in the mine.