WGBX-TV


WGBX-TV, virtual channel 44, is the secondary Public Broadcasting Service member television station licensed to Boston, Massachusetts, United States. Owned by the WGBH Educational Foundation, it is sister to Boston's primary PBS member station and company flagship WGBH-TV, Springfield, Massachusetts-based PBS member WGBY-TV, Class A Biz TV affiliate WFXZ-CD and public radio stations WGBH and WCRB in the Boston area, and WCAI radio on Cape Cod. WGBX-TV, WGBH-TV and the WGBH and WCRB radio stations share studios on Guest Street in northwest Boston's Brighton neighborhood; WGBX-TV's transmitter is located on Cedar Street in Needham, Massachusetts, which is shared with WBZ-TV, WCVB-TV, WBTS-CD and WSBK-TV.
The X in WGBX's callsign stands for "eXperimental", as WGBX was home to programming that was given a trial run on the lower-rated UHF signal before possibly moving onto the more-established WGBH-TV. Such Eastern Educational Network imports from the United Kingdom as Doctor Who were seen first or more frequently on WGBX, and one late 1970s local "nightclub"-style variety show, Club 44, proved popular enough to be moved over to WGBH and retitled The Club. The station airs PBS programs that are not aired by WGBH-TV as well as additional supplemental programming. Reruns of the previous night's programming either from WGBH-TV or from WGBX-TV itself also makes up part of channel 44's programming schedule.
WGBX also carries most of the national digital subchannel networks which are managed by the WGBH Educational Foundation ; this enables WGBH to maintain a high-bitrate 1080i high definition picture resolution on its main channel 2 signal, with little loss in visual quality.

History

The station initially existed as a construction permit for WJDW-TV, a commercial station co-owned by television producer Jack Wrather and his business partner, Maria Helen Alvarez. In 1965, Wrather and Alvarez donated the license to WGBH Educational Foundation, in which WGBH used to launch its secondary educational station. WGBX-TV first signed on the air on September 25, 1967; its transmitter has been located in Needham, WGBX's current digital transmitter shares the master antenna at the very top of the tower with the commercial stations. The now-defunct analog signal maintained a separate antenna on a lower portion of the tower that was shared with WGBH's digital transmitter.
WGBX shut down its analog signal, over UHF channel 44, on April 23, 2009. The station's digital signal continued to be broadcast on its pre-transition UHF channel 43. Through the use of PSIP digital television receivers display the station's virtual channel as its former UHF analog channel 44.
World Channel moved from digital subchannel 44.2 to 2.2 in the spring of 2012, replacing WGBH's standard definition simulcast.
On January 16, 2017, WGBX switched its DT4 subchannel from a locally programmed loop of children's programming to the relaunched national PBS Kids channel.
On January 18, 2018, WGBX began a channel share with Nashua, New Hampshire-licensed WYCN-CD, which was acquired by the NBC Owned Television Stations subsidiary of NBCUniversal. Despite WBTS' low-power status, WGBX's transmitter acts as a full-market relay of NBC O&O station WYCN-LD through WBTS-CD, along with its Cozi TV subchannel; WGBX's multiplexer was upgraded to handle WGBX's existing HD channel and two SD channels, along with WBTS-CD's HD channel and one subchannel as a result of the channel share.
In 2019, with WGBH moving to VHF 5, both station's channel maps were adapted, with WGBH handling both the 2.1 and 44.1 HD signals, and WGBX mainly carrying standard definition subchannels in order to provide appropriate bandwidth to WYCN-CD, which itself had its calls changed to WBTS-CD in the same period of time. This is equivalent to the channel distribution plan used by Twin Cities PBS in Minneapolis–Saint Paul, which divides its subchannels among two existing stations.

Digital television

Digital channels

The station's digital signal is multiplexed. Note that WGBX-DT1 actually transmits as WGBH's second subchannel to provide a full-quality high definition signal for that station:
ChannelVideoAspectPSIP Short NameProgramming
2.2480iWorldWorld Channel
2.3480iWGBH-SDSD simulcast of WGBH-TV
44.2480iWGBX-SDMain WGBX programming / PBS
44.3480iCreateWGBH Create
44.4480iKidsWGBH Kids