The Design of an Analog Communication System for Cave Communication
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Abstract
This article proposes the design of an analog communication system for use in cave communication, enabling communication between the inside and outside of the cave. The system employs two frequencies: 350 kHz for communication from inside the cave to outside, utilizing a multi-mode analog transceiver with an earth-grounded antenna, and 3 MHz for medium-range communication within the cave. The 3 MHz frequency also transmits signals, including location data or images, from within the cave to the incident command center at the cave's entrance using an AM analog transceiver with a 3 MHz antenna. A frequency converter device facilitates communication between the 350 kHz and 3 MHz frequencies. The experimental results showed that the designed communication system established that the cave entrance could maintain communication with the cave inside throughout the entire testing period.
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References
J. Huri and C. Ebi, “Alpine Cave Radio-Earth-current at Holloch,” Journal of BCRA Cave Radio & Electronics Group, No.25, pp.4-5, Sep. 1996.
M. Bedford, “Introducing a New Cave Radio for Rescue Use,” BCRA Cave Radio & Electronics Group, Vol. 41, pp. 3, Sep. 2000.
M. Bedford, “Introducing the HeyPhone,” C&C Magazine, pp.15-17, 2001.
M. Bedford, “The HeyPhone to the Rescue,” RadCom Magazine, pp.16-18, Jan. 2002.
R. Wongsan, P. Khamsalee, A. Wannakomol, P. Kumsawat, A. Srikaew, and A. Jantaupalee, “A Study on Radio Wave Propagation in Chiang
Dao Cave,” NBTC Journal 2022, pp. 123-147, 2022.
C. Trayner, “CRO HeyPhone Communications System Technical Reference Manual (Temporary),” Issue 3, pp. 1-39, Jun. 23 , (2002). [Online]. Available: https://bcra.org.uk/creg/heyphone/pdf/heyphone-techmanual.pdf
A. Jantaupalee, R. Wongsan, P. Khamsalee, A. Wannakomol, and K. Tansuwan. “A Study of Radio Wave Propagation in the Cave for Developing the Through-The-Earth Application.” GEOMATE Journal, Vol. 26, No. 118, pp. 74-86, 2024.
D. Gibson, “Channel Characterisation and System Design for Sub-Surface Communications,” Lulu Enterprises, 2010, pp. 1-274.
D. Gibson, “How Earth-Current Antennas Really Work,” CREG Journal, Vol.88, pp. 13–14, 2014.