RADIO RECEIVER ALIGNMENT INDICATOR

CM-78525 RADIO RECEIVER ALIGNMENT INDICATOR A predetermined frequency alignment signal and a white noise source signal are alternately switched through the intermediate frequency amplifier stage (IF) of the receiver being aligned. A series connected integrating capacitor and tuning meter couple between the receiver's detector output and ground potential. In operation, during the interval of white noise being applied to the IF the tuning meter is shorted and the capa-. citor is charged to a net voltage Vn which is representative of the center frequency of the IF. When the alignment signal is applied to the IF, the tuning meter short is removed and a signal Vs appears across the capacitor-meter circuit, whereby the meter reading is indicative of Vs - Vn which represents relative receiver alignment.