Cobra 29 LX CHR LE User Manual - Page 7

Ignition Noise Interference Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise. The primary source of noise in automobiles is from the alternator and ignition system. Typically, when signal level is adequate, the background noise does not present a serious problem. Also, when extremely low level signals are being received, the transceiver may be operated with the vehicle's engine turned off. The unit requires very little current and therefore will not significantly discharge the vehicle's battery. Even though the Cobra 29 LX LE has an automatic noise limiter, in some installations ignition interference may be high enough to make good communications impossible. Many possibilities exist and variations between vehicles require . different solutions. Consult your Cobra dealer or a 2-way radio technician for help in locating the source of a severe noise. 7