call sign see knbc disambiguation . not to be confused with kmbc tv . this article needs additional citations for verification . please help improve this article by adding citations to reliable sources . unsourced material may be challenged and removed . january 2013 learn how and when to remove this template message knbc los angeles california united states branding nbc4 southern california general nbc4 news newscasts slogan nbc 4 you channels digital 36 uhf virtual 4 psip translators see article affiliations .1 nbc o & o .2 cozi tv owner nbcuniversal nbc telemundo license llc first air date january 16 1949 ; 67 years ago 1949 01 16 call letters meaning k national broadcasting company sister station s kvea former callsigns knbh 1949 1954 krca 1954 1962 former channel number s analog 4 vhf 1949 2009 transmitter power 380 kw height 991 m 3 251 ft facility id 47906 transmitter coordinates 34 13 32 n 118 3 52 w 34.22556 n 118.06444 w 34.22556 ; 118.06444 coordinates 34 13 32 n 118 3 52 w 34.22556 n 118.06444 w 34.22556 ; 118.06444 licensing authority fcc public license information profile cdbs website www.nbclosangeles.com knbc channel 4 is an nbc owned and operated television station located in los angeles california united states . knbc is owned by the nbc owned television stations group and operates as part of a television duopoly with corona licensed kvea channel 52 an o & o of the spanish language telemundo network ; both networks are owned by nbcuniversal a subsidiary of comcast . knbc s studios and offices are located in the universal studios hollywood backlot and its transmitter is located on mount wilson . in the few areas of the western united states where an nbc station is not receivable over the air knbc is available on satellite television through directv . contents 1 history 2 digital television 2.1 digital channels 2.2 nbc california nonstop 2.3 analog to digital conversion 3 community affairs 4 syndicated programming 5 news operation 5.1 news team 5.1.1 current on air staff 5.2 notable former on air staff 6 rebroadcasters 7 references 8 external links history edit nbc studios in burbank california 1978 . channel 4 first went on the air as knbh standing for nbc hollywood on january 16 1949 . 1 it was the penultimate vhf station in los angeles to debut and the last of nbc s five original owned and operated stations to sign on . unlike the other four knbh was the only nbc owned television station that did not benefit from having a sister radio station . the nbc radio network had long been affiliated with kfi in los angeles though that relationship did not extend into television in august 1948 when kfi tv channel 9 now kcal tv signed on the air . 2 when knbh signed on it marked the debut of nbc programs on the west coast . the station changed its callsign to krca for nbc s then parent company the radio corporation of america on october 18 1954 . 3 the call letters were changed again on november 11 1962 when nbc moved the knbc identity from its san francisco radio station which became knbr and applied it to channel 4 in los angeles . 4 5 channel 4 originally broadcast from the nbc radio city studios on sunset boulevard and vine street in hollywood . in november 1962 the station relocated to the network s color broadcast studio facility in suburban burbank . nbc color city as it was then known had been in operation since march 1955 and was at least four to five times larger than radio city and could easily accommodate knbc s locally produced studio programming . nbc radio s west coast operations eventually followed channel 4 to burbank not too long after . the brokaw news center new location at the universal lot 2015 on october 11 2007 nbcuniversal announced that it would put its burbank studios up for sale and construct a new all digital facility near the universal studios backlot in universal city in an effort to merge all of nbcuniversal s west coast operations into one area . as a result knbc kvea and nbc news los angeles bureau moved to a new digital facility on the universal lot formerly occupied by technicolor sa . the studio opened on february 1 2014 . 6 shortly thereafter nbcuniversal named the new broadcast center in honor of former knbc and nbc news anchor reporter tom brokaw christened the brokaw news center . 7 in fall 2007 with digital broadcast roll out the station began broadcasting a 24 7 newschannel news raw on a subchannel . 8 on january 16 2009 knbc celebrated its 60th anniversary with an hour long tribute to the station featuring past and present anchors hosts other popular on air staff and major news stories . knbc and its other nbc owned and operated stations introduced a new layout for their websites in july 2009 . digital television edit digital channels edit the station s digital channel is multiplexed channel video aspect psip short name programming 9 4.1 1080i 16 9 nbc 4la main knbc programming nbc 4.2 480i cozi tv cozi tv knbc also maintains a mobile dtv feed of subchannel 4.1 labelled knbc 4.1 broadcasting at 1.83 mbit s. 10 11 on january 1 2012 universal sports transitioned into a cable and satellite exclusive service causing its affiliates such as knbc to replace the network and remove the channel from their digital signals entirely with knbc deleting digital subchannel 4.4 which also carried nbc weather plus from its november 15 2004 launch to november 30 2008 as result of the loss of universal sports . nbc california nonstop edit see also cozi tv logo for nbc california nonstop . knbc operated nbc california nonstop a collaboration between knbc and two other nbc owned stations in california knsd in san diego and kntv in san jose which launched on may 3 2011 and replaced programming from nbc plus on the second digital subchannels of all three stations . in the case of knbc it was the second news oriented digital channel operated by the station as digital channel 4.2 featured a rolling news format under the name newsraw which moved from digital channel 4.4 upon weather plus december 1 2008 shutdown prior to the launch of california nonstop . 12 each station produced a local newscast at 7 p.m. that was tailored to their respective market . for the los angeles feed of the channel colleen williams anchored the hour long nonstop news la . citation needed nbc california nonstop ended on december 20 2012 when cozi tv was launched . analog to digital conversion edit knbc shut down its analog signal over vhf channel 4 on june 12 2009 as part of the federally mandated transition from analog to digital television . 13 the station s digital signal remained on its pre transition uhf channel 36 14 using psip to display knbc s virtual channel as 4 on digital television receivers . since the station qualified for the nightlight clause in the dtv delay act 15 it was required to keep its analog signal on for two weeks from june 12 to 26 2009 to inform viewers of the digital television transition consisting of a loop of digital transition public service announcements while the digital channel was used for normal programming . community affairs edit current studio building shared by knbc and kvea knbc has a legacy of participating in the community . the station supports many social causes including health and wellness the environment diversity and supports under served populations like the homeless veterans at risk youth and women s issues . knbc has been recognized by many nonprofit organizations for its community work and has partnerships with several prominent organizations including the l.a. alliance of boys & girls clubs court appointed special advocates los angeles california community foundation american red cross los angeles march of dimes american heart association american cancer society hispanic scholarship foundation and others . the station also produces a news series called life connected which airs sundays during the news at 11 p.m. and repeats on mondays during the news at noon . life connected tells stories of meaningful connections between individuals and celebrates the diverse communities that make up southern california . the station launched the nbc4 life connected award to further spotlight these individuals at community events . syndicated programming edit syndicated programming seen on knbc includes steve harvey and the ellen degeneres show . knbc is the flagship station for extra and access hollywood and its live counterpart which is produced by knbc both of which also air on knbc and other nbc owned and operated stations . 16 as of june 2016 knbc is one of five nbc owned stations that distribute programming either nationally or regionally along with kntv wnbc wvit and wtvj . news operation edit nbc4 news newscast title card from february 4 2012 until july 24 2016 as of 2016 knbc broadcasts 37 hours of locally produced newscasts each week with 6 hours on weekdays and 2 hours each on saturdays and sundays . the station s newscasts has historically more of a serious tone covering issues such as politics government education and the economy than other los angeles area newscasts . 17 in 2010 the norman lear center at the university of southern california found knbc to have the least coverage of crime and the second highest coverage of local government and sports and weather compared to other los angeles stations . as part of a 2012 investment by parent company comcast knbc s newscasts added 18 employees and produced more enterprise reporting . 18 the station runs a special hour long newscast on sunday nights following the fred roggin hosted sports themed game show the challenge during the nfl season where nbc sunday night football telecasts preempt the 6 p.m. newscast . on election nights knbc runs a special extended edition of its 11 p.m. newscast to show early election results . nbc4 s investigative team i team features former kcbs reporter joel grover as its lead investigator . 19 in 2013 nbc4 southern california won the investigative reporters & editors award for in harm s way a series of reports on transportation safety which resulted in changes to the rise in tour bus accidents and government policing of the industry including exposing one company and regulators shutting down six others . 20 knbc has had a very stable news team over the years weeknight anchor colleen williams who also occasionally reports for msnbc and nbc news sports anchor fred roggin also has the nickname the dean of l.a. sports and serves as sports announcer for nbc s olympics coverage and chief weathercaster fritz coleman who like roggin has also occasionally appeared on the tonight show and once hosted a late night variety show for knbc called it s fritz from 1989 to the early 1990s have each been at the station more than 25 years . former knbc anchor paul moyer worked two stints at channel 4 ; first from 1972 to 1979 when he began a 13 year run at rival kabc tv and from july 1992 until his april 2009 retirement . like moyer anchor chuck henry was also a mainstay at kabc tv before making the move to channel 4 in january 1994 . he currently produces through his self titled production company the travelogue series travel cafe which airs weekends on knbc . kelly lange stu nahan john schubeck tritia toyota jess marlow david sheehan john beard and nick clooney are other notables who have worked on knbc s newscasts in the past . for most of the last 30 years when knbc has waged a spirited battle with kabc tv for the top rated local newscast in southern california becoming a three way race