Smaller towered airports generally fall under Class D airspace. These airspaces are marked with dashed blue lines, usually have a 4-5 nm radius, and comprise a single layer that typically extends ...

Class D amps are simple – just take an input, and use that to modulate a square wave with PWM. Send this PWM signal to a MOSFET or something, and you have the simplest class D amp in existence.

Some lawmakers have tried to sound the alarm about the congested airspace around Ronald Reagan Washington National Airport. In May, all four senators from Virginia and Maryland voted against an ...

Russia's Federal Air Transport Agency, via its official VKontakte account, announced (15-Feb-2025) the establishment of a new 'N' airport class for drones, in addition to A, C and G aircraft classes, ...