KRCB (channel 22) is a PBS member television station licensed to Cotati, California, United States, serving the San Francisco Bay Area.

In 1963, at the request of the Sonoma State College Foundation, the Federal Communications Commission (FCC) allocated educational channel 16 to Cotati.

[3] In the late 1970s, John Kramer, a professor at Sonoma State University, served in the White House Office of Telecommunications Policy and discovered that the Cotati educational allotment was still available.

[4] As a result, in 1981, John Kramer founded the Rural California Broadcasting Corporation (RCBC) to file for, construct, and operate the educational station.

[7] However, Sonoma State did not provide support for the station; the two split when president Peter Diamandopoulos declared, "If I don't control the board of directors, it cannot be on campus.

Its proposal, filed on the last day to do so and without any public notice in local newspapers, envisioned using channel 22 to broadcast subscription television programming for the Black community in the Bay Area.

[17] KRCB began broadcasting on December 2, 1984, providing service to more than a million people, including many in the North Bay that could not receive KQED from San Francisco.

"[10] The length of time it took to put the station on the air left its finances in a precarious condition: it had to nearly immediately refinance its studios to raise money that would count as matching funds for its original 1982 grant.

This was a service not matched by KQED, though the San Francisco public station continued to have a far wider base of support and a far larger operating budget.

[28] KRCB began digital telecasting in late 2003, participating in a pilot program to use bandwidth to provide internet service to households in rural Sonoma County;[29] shut down its analog signal, over UHF channel 22, on June 12, 2009, as part of the federally mandated transition from analog to digital television.

[34] KRCB relaunched KCSM-TV as KPJK on July 31, 2018; the station was named in honor of John Kramer, who had died in 2014.