INDUCTIVE LOOP THROUGH-THE-EARTH COMMUNICATION SYSTEM
A transmitter having a long line antenna grounded at both ends transmits audio signals through the earth to one or more receivers in a mine. Each receiver has a simple audio amplifier coupled to a loop antenna which compensates for greater attentuation of the higher audio frequencies being transmitt...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A transmitter having a long line antenna grounded at both ends transmits audio signals through the earth to one or more receivers in a mine. Each receiver has a simple audio amplifier coupled to a loop antenna which compensates for greater attentuation of the higher audio frequencies being transmitted. |
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