Results of tests conducted in North River tunnel of Pennsylvania Railroad; frequencies between about 25 and 1500 Mc are unsuitable; how satisfactory transmission can be obtained up to 6000 ft using frequencies and equipment ordinarily employed in railroad mobile systems and twin-lead cable such as RG-86/U suitably located within tunnel, to couple closely with train antennas.
Communication with moving trains in tunnels
Inst Radio Engrs -- Trans Vehicular Communications
1956
8 pages
Article (Journal)
English
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