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| Keywords: Radios in Tunnels (5940521201).jpg Electronics Engineer Dennis Camell foreground aligns antennas in an old California silica mine for a NIST study identifying optimal frequencies for radio signal transmissions in tunnels Credit G Koepke/NIST Disclaimer Any mention of commercial products within NIST web pages is for information only; it does not imply recommendation or endorsement by NIST Use of NIST Information These World Wide Web pages are provided as a public service by the National Institute of Standards and Technology NIST With the exception of material marked as copyrighted information presented on these pages is considered public information and may be distributed or copied Use of appropriate byline/photo/image credits is requested https //www flickr com/photos/usnistgov/5940521201/ Radios in Tunnels 2007-03-20 13 26 https //www flickr com/people/63059536 N06 National Institute of Standards and Technology PD-USGov National Institute of Standards and Technology https //flickr com/photos/63059536 N06/5940521201 2016-09-07 02 15 25 United States Government Work Uncategorized 2016 November 8 | ||||
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