Providing Global Communications Historical

Providing Global Communications Historical (HM1XS0)

Location: Point Reyes Station, CA 94956 Marin County
Country: United States of America

N 38° 5.499', W 122° 56.772'

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Point Reyes Receiving Station

The Radio Corporation of America (RCA) wireless stations on the Point Reyes Peninsula were know as the "Wireless Giant of the Pacific." The station locations and cutting-edge wireless technology developed by the company under the leadership of long-time chairman, David Sarnoff, transmitted a signal recognized by shipboard operators throughout the Pacific as station KPH.
Station KET operated point-to-point services at this site beginning in 1931 through receivers affectionately know as "Green Giants." In 1946, ship-to-shore Morse station KPH relocated here and continued commercial operations until 1998.
KPH received one of the first standard three letter call signs in the United States in 1904 when it was located at the Palace Hotel in San Francisco. KPH was acquired by Marconi Wireless Telegraph Company of America in 1912. Two years later Guglielmo Marconi completed a new long-wave receiving station on Tomales Bay, as well as a state-of-the-art transmitting station in Bolinas. The stations successfully made the first wireless transmission across the Pacific that same year, opening up instant communications to Hawaii for the first time, a boon for business and news. The stations were acquired by the newly formed RCA following WWI.
NPS & MRHS: Partners in Station Preservation

the station's closure in 1998 due to technological advances in ship-to-shore communications, the National Park Service acquired the Point Reyes and Bolinas radio sites. Members of the Maritime Radio Historical Society (MRHS) stepped forward to partner with Point Reyes National Seashore. Currently operated under the call letters KSM, and licensed for Morse transmission, MRHS members operate the station and a docent program. They work with the park to assure that the equipment, archives, station history and the legacy of its operators are preserved and its storied past shared with the public. Tour information is available at
HM NumberHM1XS0
Placed ByNational Park Service, Point Reyes National Seashore
Marker ConditionNo reports yet
Date Added Tuesday, April 11th, 2017 at 5:05pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 504717 N 4215985
Decimal Degrees38.09165000, -122.94620000
Degrees and Decimal MinutesN 38° 5.499', W 122° 56.772'
Degrees, Minutes and Seconds38° 5' 29.94" N, 122° 56' 46.32" W
Driving DirectionsGoogle Maps
Area Code(s)415
Which side of the road?Marker is on the right when traveling South
Closest Postal AddressAt or near 19474-19816 Sir Francis Drake Blvd, Point Reyes Station CA 94956, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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