1993 GMC Sonoma Owner's Manual - Page 136

Comfort Controls & Audio Systems FM Stereo FMstereowillgiveyouthebestsound.But FM signalswillreachonlyabout 10 to 40 miles (16 to 65 km).And,tallbuildingsorhillscaninterferewith FMsignals,causingthesound to comeandgo. AM TherangeformostAMstationsisgreaterthanforFM,especiallyatnight. Thelongerrange,however,cancausestations to interferewitheachother. AM canpickupnoisefromthingslikestormsandpowerlines.Tryreducing thetreble to reducethisnoise if youevergetit. AM Stereo C-QUAIP ThismeanstheDelco@systemcanreceiveC-QUAM@stereobroadcasts. Many AM stationsaroundthecountryuseC-QUAM@toproducestereo, thoughsomedonot.(C-QUAM@ is a re isteredtrademarkofMotorola,Inc.) If your Delco@ system can get C-QUAM R , your "STEREO" light will come on whenyou'rereceivingit. 8 3-8