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2. Portland International Jetport - Wikipedia

   en.wikipedia.org/wiki/Portland_International_Jetport

   Portland International Jetport (IATA: PWM, ICAO: KPWM, FAA LID: PWM) is a public airport two miles (3 km) west of downtown Portland, Maine, United States. It is owned and operated by the City of Portland. A portion of the Jetport's property, including the main runway, is located within the neighboring city of South Portland.

3. Pulse-width modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-width_modulation

   Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), [1] is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period). PWM is useful for controlling the average power or amplitude delivered by an

4. Ronald Reagan Washington National Airport - Wikipedia

   en.wikipedia.org/wiki/Ronald_Reagan_Washington...

   A 1935 drawing of the proposed site for the new airport, then known as Municipal Air Port The airport's main terminal in July 1941 The airport's terminal in July 1941, seen from the apron with a taxiing Eastern Airlines Douglas DC-3 in the foreground The airport's terminal as seen from the airfield in 1944 The airport in 1970 The National Mall ...

5. Presidential Airways (scheduled) - Wikipedia

   en.wikipedia.org/wiki/Presidential_Airways...

   It was founded in 1985 by Harold J. (Hap) Pareti, formerly an officer at People Express Airlines, known as PEOPLExpress a low-cost carrier, with Boeing 737-200 service from Washington Dulles to Boston Logan in Massachusetts commencing October 10 of that year. A small fleet of B737-200 jetliners were initially operated by the airline.

6. Pulse-frequency modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-frequency_modulation

   Comparison of PFM (top) and PWM (bottom) of a signal that starts at a constant low value and then transitions to a constant high value. Pulse-frequency modulation (PFM) is a modulation method for representing an analog signal using only two levels (1 and 0).

7. Random pulse-width modulation - Wikipedia

   en.wikipedia.org/wiki/Random_pulse-width_modulation

   Electromagnetic interference (EMI) filters have been widely used for filtering out the conducted emissions generated by power converters since their advent. However, when size is of great concern like in aircraft and automobile applications, one of the practical solutions to suppress conducted emissions is to use random pulse-width modulation (RPWM).