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Oregon Public Broadcasting (logo).svg
Portland, Oregon
Branding OPB
Channels Digital: 10 (VHF)
Affiliations PBS
Owner Oregon Public Broadcasting[1]
First air date February 6, 1961 (as KOAP-TV)
Call letters' meaning Oregon
Former callsigns KOAP-TV (1961-1989)
Former channel number(s) Analog:
10 (VHF, 1961-2009)
27 (UHF, 2001-2009)
Former affiliations NET (1961-1970)
Transmitter power 32.4 kW
Height 524 m
Facility ID 50589
Transmitter coordinates 45°31′21″N 122°44′45″W / 45.52250°N 122.74583°W / 45.52250; -122.74583
Website www.opb.org

KOPB-TV is a public television station serving the Portland, Oregon television market. It is owned and operated by Oregon Public Broadcasting. It broadcasts its digital signal on VHF channel 10.

KOPB-TV originally signed on the air as KOAP-TV, on February 6, 1961.[2] The call sign letters stood for "Oregon Air Portland", preceded by the K prefix the Federal Communications Commission uses when assigning call signs for stations west of the Mississippi River.[3] It was a sister station to KOAC-TV in Corvallis, Oregon, whose call letters – carried over from KOAC-AM, which received them in the mid-1920s during its early years broadcasting as an AM radio station – stood for "Oregon Air Corvallis". KOAP was first housed at the campus of Portland State College, with the transmitter being located on Council Crest.[3] KOAP-TV was a member of NET, or National Educational Television, carrying its programs. On April 30, 1962, KOAP-TV's FM sister service (KOAP-FM) signed on the air. By 1966, most local programs originated at KOAP-TV.

Originally known on-air as OEB (Oregon Educational Broadcasting), the organization running the station changed its name in early 1972 to OEPBS (Oregon Educational & Public Broadcasting Service). The network was spun off from the state board of education in October 1981 and renamed Oregon Public Broadcasting. At the same time, the network moved to Portland, and KOAP-FM/TV became the flagship stations. On February 15, 1989, KOAP changed their call letters to KOPB, for both radio and television.[4]

OPB was a pioneer in HDTV. As early as March 5, 1997, OPB's experimental HDTV station transmitted a random-bit data stream. On September 15, 1997, OPB Portland was assigned the experimental call letters KAXC for channel 35. Then on October 11, 1997, at 4:37 p.m. KAXC became the first TV station in Oregon and one of the first on the west coast to transmit an HDTV picture. After experimentation ended, channel 35 was vacated. On December 7, 2001 KOPB-DT began operation on channel 27.

Analog-to-digital conversion[edit]

At the analog television shutdown on June 12, 2009,[5] KOPB-DT moved to channel 10,[6] the same channel the station had always used for its analog broadcasts.


  1. ^ Nelson, Bob (June 2, 2009). "Call Letter Origins" 238. The Broadcast Archive. Retrieved June 21, 2009. 
  2. ^ "Educational TV Wins Good Opening Response". (February 7, 1961). The Oregonian, p. 9.
  3. ^ a b Swing, William (February 5, 1961). "Portland To Get First Glimpse Of Educational TV Monday". The Sunday Oregonian, p. 33.
  4. ^ Farrell, Peter (February 15, 1989). "Not all of 'Elephant' has Dumbo cuteness" (TV column headed by review of new National Geographic special). The Oregonian, p. F7. Excerpt: "New name: After more than a quarter-century, Portland's public television and radio stations have new call letters. KOAP has become KOPB, for Oregon Public Broadcasting."
  5. ^ http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-06-1082A2.pdf
  6. ^ CDBS Print[dead link]

External links[edit]