Patent ID: 8725188

Claim:
A system for communicating voice or data information in an enclosed space, the system comprising: a high-frequency (HF) conversion side comprising an HF modulator and an HF demodulator and coupled with an HF antenna; and a medium-frequency (MF) conversion side comprising an MF modulator and an MF demodulator and coupled with an MF antenna; wherein the HF conversion side is coupled to the MF conversion side at the HF demodulator and the HF modulator; wherein the HF conversion side is adapted to receive a first HF signal from the HF antenna and produce a first baseband signal and to receive a second baseband signal from the MF conversion side and produce a second HF signal; wherein the MF conversion side is adapted to receive the first baseband signal and produce a first MF signal and to receive a second MF signal from the MF antenna and produce the second baseband signal; and wherein the HF conversion side is physically separate from the MF conversion side.