"Early Broadcasting in the San Francisco Bay Area" by John Schneider, 1997 (theradiohistorian.org). In the October 1921 Pacific Radio News, Radio Telephone Shop Concert Set" stated that "Mr. Pendleton is one of the radio telephone pioneers of the West. His first telephone made its debut on the air about a year and a half ago." The Atlantic-Pacific Radio Supplies Company's 6XC also debuted in early 1920. Charles Herrold made an extensive series of broadcasts beginning in 1912, but had to shut down during World War One, and did not return to the airwaves until 1921.
"Vibrations", Pacific Radio News, April 1921, page 296.
"Sixth District", Amateur Radio Stations of the United States (June 30, 1920 edition), page 70. The "6" in 6UV's call sign specified that the station was located in the Sixth Radio Inspection district, while the fact that "U" fell in the range A—W indicated that the station held a standard Amateur license.
"New Stations: Special Land Stations", Radio Service Bulletin, May 2, 1921, page 3. The "X" in 6XAE's call sign indicated that the station was operating under an Experimental license.
"New Stations", Radio Service Bulletin, January 3, 1922, page 2. Limited Commercial license, serial #256, issued December 20, 1921 to The Radio Telephone Shop for a one period.
"Early Broadcasting in the San Francisco Bay Area" by John Schneider, 1997 (theradiohistorian.org). In the October 1921 Pacific Radio News, Radio Telephone Shop Concert Set" stated that "Mr. Pendleton is one of the radio telephone pioneers of the West. His first telephone made its debut on the air about a year and a half ago." The Atlantic-Pacific Radio Supplies Company's 6XC also debuted in early 1920. Charles Herrold made an extensive series of broadcasts beginning in 1912, but had to shut down during World War One, and did not return to the airwaves until 1921.
