computer science

WPFO

WPFO is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand WPFO rather than just read about it. In short: WPFO (channel 23) is a television station licensed to Waterville, Maine, United States, serving the Portland area with programming from the digital multicast network Roar. It is owned by Sinclair Broadcast Group alongside CBS/Fox affiliate WGME-TV (channel 13).

Key takeaways

WPFO belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WPFO to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WPFO from memory before moving on to harder problems.

Reference excerpt

WPFO (channel 23) is a television station licensed to Waterville, Maine, United States, serving the Portland area with programming from the digital multicast network Roar. It is owned by Sinclair Broadcast Group alongside CBS/Fox affiliate WGME-TV (channel 13). The two stations share studios on Northport Drive in the North Deering section of Portland; WPFO's transmitter is located on Brown Hill west of Raymond. WPFO was built as WMPX-TV and began broadcasting in August 1999. It was Portland's Pax affiliate. In 2003, Paxson sold the station to Corporate Media Consultants Group, which converted it to a Fox affiliate that April. At the time, Portland had not had a Fox affiliate since October 2001. WGME-TV began producing a 10 p.m. newscast for WPFO in February 2007 and expanded its relationship with a morning newscast in 2010. Sinclair acquired the station's non-license assets in 2013, with Cunningham Broadcasting purchasing the license in 2017. In December 2025, WPFO's Fox subchannel moved to WGME-TV.

History

Construction and Pax era Channel 23 was allocated to Waterville, Maine, in 1987 on a petition from the Passamaquoddy Tribe. The tribe, which owned radio stations in Rockland, had expressed interest in starting a station that would cater to local advertisers in the Waterville area unserved by buying ad time on stations in Bangor or Portland. In spite of the allocation, no one applied for the channel. This changed in 1996, when five applicants filed for channel 23. The only Maine-based group was Diversified Communications, owner of Bangor CBS affiliate WABI-TV. It proposed locating the station's studios in facilities WABI was leasing in Waterville. Because of a backlog of license applications that were mutually exclusive, stemming from a court-ordered end to the comparative hearings that once chose winning applicants in these cases, the Federal Communications Commission (FCC) allowed for financial settlements in dozens of markets. In this window, WinStar Broadcasting emerged with the channel 23 construction permit. WinStar transferred 49 percent of the permit to Paxson Communications Corporation, owner of the then-new Pax network. The tower to broadcast the new station from Oak Hill Road in Litchfield was erected in 1999. Channel 23 began broadcasting August 27, 1999, as WMPX-TV. It provided Pax its first broadcast coverage in southern Maine; the network had only been available on cable. In August 2000, Portland NBC affiliate WCSH (channel 6) signed a joint sales agreement to provide advertising sales and limited programming to WMPX-TV. WCSH officials twice mentioned the possibility of airing a newscast on channel 23 but had not done so by 2002.

Fox era In November 2002, Paxson Communications Corporation announced it was selling WMPX-TV to the Ohio-based Corporate Media Consultants Group for $10 million. Corporate was a joint venture of Max Media and Power Television. The deal led to speculation that WMPX-TV would become Portland's new Fox affiliate. The year before, Fox had cut ties with WPXT (channel 51), whose owner Pegasus Broadcast Television failed to come to a deal with the network. Southern Maine was thus largely dependent on Foxnet for the channel's programming, leaving Fox sports programs at the whim of equipment faults related to syndication exclusivity blackouts or locally irrelevant NFL game selections. Corporate Media confirmed WMPX-TV would become the new Portland Fox affiliate when it took over. Channel 23 became a Fox affiliate under the new WPFO call sign on April 15, 2003. The station operated from office space on Oxford Street in Portland. Beginning in November 2005, it aired a video simulcast of radio station WLOB's morning show with local headlines displayed on the screen, branded as the Fox Morning News. This continued to air until March 30, 2009. On February 5, 2007, Portland CBS affiliate WGME-TV began producing a nightly 10 p.m. newscast for WPFO after a news share agreement was established between the two. It aired from a secondary set at WGME's studios. The news relationship expanded in 2010 when the newscast was lengthened to an hour; a new two-hour morning newscast from 7 to 9 a.m., titled Good Day Maine, was added. On October 31, 2013, WGME-TV owner Sinclair Broadcast Group acquired the non-license assets of WPFO from Corporate Media Consultants Group for $13.6 million. An affiliate of Sinclair, Cunningham Broadcasting Corporation, filed to acquire the license assets for $3.4 million on November 19, but the deal was not approved until June 23, 2017. In 2024, WGME began airing a new lifestyle program, ARC Maine, at 9 a.m.; the morning newscast was shortened to an hour, with the 8 a.m. hour replaced by The National Desk. Sinclair filed to buy WPFO outright from Cunningham in August 2025, following a decision by the United States Court of Appeals for the Eighth Circuit that struck down limitations on ownership of two of the four highest-rated TV stations in a market. On December 8, 2025, the Fox affiliation was moved to WGME-TV's second subchannel, while WPFO's main channel flipped to Roar. The sale was completed on March 1, 2026.

Technical information and subchannels Since June 2024, WPFO has served as Portland's ATSC 3.0 (NextGen TV) lighthouse station. The station's ATSC 1.0 channels are carried on the multiplexed signals of other Portland television stations:

WPFO's transmitter is located on Brown Hill west of Raymond and broadcasts these channels:

References

Worked examples

Example 1 — a first encounter with WPFO

Start with the simplest possible case. Write down what WPFO claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to WPFO before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about WPFO ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of WPFO

In research: WPFO appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses WPFO in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: WPFO is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1999 establishments in Maine, ATSC 3.0 television stations, Antenna TV affiliates, so understanding it makes those chapters shorter.
In everyday life: Look for WPFO outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study WPFO in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WPFO means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain WPFO out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WPFO in simple terms?

Why does WPFO matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study WPFO?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on WPFO.