mazda-om-release2-029 1..372 ++ - Mazda Canada

Interior ComfortAudio SystemqRadio ReceptionAM characteristicsAM signals bend around such things asbuildings or mountains and bounce off theionosphere. Therefore, they can reachlonger distances than FM signals. Becauseof this, two stations may sometimes bepicked up on the same frequency at thesame time.Station 1IonosphereStation 2FM characteristicsAn FM broadcast range is usually about40―50 km (25―30 miles) from thesource. Because of extra coding needed tobreak the sound into two channels, stereoFM has even less range than monaural(non-stereo) FM.FM Station40—50 km(25—30 miles)Signals from an FM transmitter are similarto beams of light because they do notbend around corners, but they do reflect.Unlike AM signals, FM signals cannottravel beyond the horizon. Therefore, FMstations cannot be received at the greatdistances possible with AM reception.FM waveFM waveIonosphereAM wave100—200 km (60—120 miles)Atmospheric conditions can also affectFM reception. High humidity will causepoor reception. However, cloudy daysmay provide better reception than cleardays.Multipath noiseSince FM signals can be reflected byobstructions, it is possible to receive boththe direct signal and the reflected signal atthe same time. This causes a slight delayin reception and may be heard as a brokensound or a distortion. This problem mayalso be encountered when in closeproximity to the transmitter.DirectReflected wave6-17