Sentinel-Radio-Corp-353 电路原理图.pdf

ALL voltages except heaters ARE ME ASURCO from SOCKET CONTACTS TO THE COMMON NCCATiVE WITH A IOOO OHM PER VOlT VOLTMETER. HEATER VOLTAGES ARE MEaSUREO 01RECTLV ACROSS SOCKET CONTACTS. A 0 CLOCK TERM. VK Ibrown_ AS JsRHN I E ALIGNMENT PROCEDURE v -1 When aligning the 1620 KC OSCILLATOR TRIMMER or the 1400 KC ANTENNA TRIMMER, couple test oscillator to receiver loop by: (1) make loop consisting of five to ten turns of NO. 20 to NO. 30 size wire, wound on a 2 to 3 form; (2) connect this loop across output of test oscillator; (3) place test oscillator loop near radio loop. TEST OSCILLATOR Use dummy antenna in series A., . , . , , . with outpnt of Attach utPut f test test oscillator oscillator to: consisting of: Steps Set receiver dial to: Adjust test oscillator frequency to: Refer to parts layout diagram for location of trimmers mentioned below: Any point where no interfering signal is re ceived. Exactly 1620 K.C. Exactly 1620 K.C. .02 MFD. condenser See paragraph above. High side to antenna stator plates of tuning condenser. Low side to common negative. See paragraph above. Adjust each of the second I.F. transformer trimmers for maximum output then adjust each of the first I.F. trimmers for maximum output. Adjust 1620 K.C. oscillator trimmer for maximum output. Approx. 1400 K.C. Approx. 1400 K.C. See paragraph above. See paragraph above. Adjust 1400 K.C. antenna trimmer for maximum output. 收音机爱 好者资料库 RadioFans.CN