Sentinel-Radio-Corp-339-K 电路原理图.pdf

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1、Step* MANUAL OF 19S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS Sentinel Radio Models 339-K and 1U339-K Alignment Procedure (A) Check tuning dial adjustment by tuning gang condenser until plates touch maximum capacity stop (completely in mesh) at which point the dial needle must be exactly even with the last

2、line at the low frequency end of the dial calibration. If the dial needle does not point exactly to the last line move to correct position by holding dial needle shank at the point where it attaches to its drum while turning the drum on the gang condenser. (B) Use an accurately calibrated test oscil

3、lator with some type pf output measuring device. (C) THE LOOP MAY BE LEFT IN THE CABINET and the chassis with its mounting board pulled out of the cabinet just far enough for adjustment of the trimmers, or the loop and chassis may be removed from the cabinet and the loop placed in the same position

4、and plane it will be in when both are mounted in cabinetapproximately 1 space between receiver loop and chassis. Couple test oscillator to receiver loop by: (1) make loop consisting of 5 to 10 turns of No. 20 to No. 30 size wire, wound on a 2 or 3 form; (2) connect this loop across output of test os

5、cillator; (3) place test oscil lator loop near radio loop. BE SURE THAT NEITHER LOOP MOVES WHILE ALIGNING. TEST OSCILLATOR Set receiver dial to: Adjust test oscillator frefluency to: Use dummy antenna in series with output of test oscillator consisting of: Attach output of test oscillator to: Refer

6、to parts layout diagram for toeatlon of trimmers mentioned below: Any point wlieie no interfering signal is recehed .02 MFD. See Paragraph (Cl Above High side to rear stator plates of tun ing condenser. Low side to chassis (enimuon negathe In 1U339K) through a .02 Mfd. blocking condenser. Adjust eac

7、h of the second 1. F. transformer trimmers for maximum outputthen adjust each of the first I.F.| trimmers for maximum output. See Paragrapli (C) Above See Paragraph (C) Ahove Adjust 1650 K. C. oscillator trimmer for maximum output. Adjust 1400 K. C. antenna trimmer for maximum output. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN