Now there is probably a better explanation of pulsars and the first one given as interference.
Whichever is the true explanation has to come from the Maxwell Equations. I was looking up pulsars and find that some of them are pulses in the X-ray and gamma ray wavelengths, no longer the radio waves.
So let me provide an alternative via the Maxwell Equations.
Probably all of us have encountered the situation in life where we are near a loud playing radio or sound system. Perhaps a neighbor with his boom-box or a car with boom box playing at full volume. And some songs have a lot of bass rhythm. So that as we go away from the deafening sound we get to a point where we still hear the boom box but we hear the bass in pulses.
Now sound waves are not like EM waves which are transverse waves, but can we get EM waves to behave as though the further away we go from the source that all we pick up is the EM waves of a pulsed frequency? So can we imitate the sound boom box of a loud speaker system that as we move further away from the sound (the noise) that the noise becomes a pulsed signal?
So that pulsars would then be totally normal stars except that we are caught in a distance in which their accumulative frequencies are observed by us at a single frequency of a pulsed signal. When we get a distance away from the loud music of a boom box, we no longer hear any high notes but only one low notes of bass and pulsed.
Now if you look at the history of pulsar observations, none are found outside our galaxy and all are found at a certain distance from Earth. This sort of supports the idea that pulsars are just distance dependent normal stars whose radiation has become a single frequency. Now if we were moved to a different planet in the Milky Way, the pulsars we find would be a different set of stars than the ones found for Earth. So that a pulsar with Earth as base source is not a pulsar from a nearby planet since the distances are different.
So this explanation is supportive of the Maxwell Equations and this explanation makes the pulsar phenomenon based not on some physical property of the star in question but simply on the traveling distance of its EM radiation and that distance to the observer. As we move closer to the boom box noise (some call it music) we begin to hear higher notes and other notes and not just a pulsed bass sound at a far distance.
Google's archives are top-heavy in hate-spew from search-engine- bombing. Only Drexel's Math Forum has done a excellent, simple and fair archiving of AP posts for the past 15 years as seen here: