An observer, in rectilinear motion under constant proper acceleration, passes near a source of monochromatic radiation at rest. In the context of special relativity, we describe the observed Doppler effect. We describe also the interesting discontinuous effect when riding through occurs. An English version of this article is available. - - - - - - - - - - - Observanto ^ce rekta movo ^ce konstanta propra akcelo pasas preter restanta fonto de unukolora radiado. ^Ce la special-relativeco, ni priskribas la observatan Doppleran efekton. Ni anka^u priskribas la interesan nekontinuan efekton se trapaso okazas.