Hallicrafters-Inc-S-40A 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS The Hallicrafters Co. MODEL S-40A C c22 Cjo .u #*._ ALIGNMENT . /,/ EQUIPMENT: 1. Signal Generator capable of the ranges indicated in the Alignment Chart, including a 400 cycle audio modulator. 2. Output meter capable of handlin

2、g 1.5 watts of audio power. 3. Standard RMA dummy consisting of a 200 rrrmf con denser in series with a 20uh r-f choke which is shunted by a 400 mmf condenser in series with a 400 ohm carbon resistor. 4. Non-metallic screw driver. CONNECTIONS: Connect the Sig. Gen. “cold” lead to the receivers chass

3、is; the “hot” lead is connected as * indicated in the Chart. Connect the output meter across the speaker voice coil. Caution: Set the meter at a sufficiently high range to pre vent possible damage from overload. CONTROL SETTINGS: After allowing about a ten minute. warm up period, set the receivers c

4、ontrol as follows: SENSITIVITY control at full clockwise (maximum). VOLUME control at full clockwise (maximum). CW/AM switch at “AM” (except for BFO adjustment). 3 A.V.C. switch at “OFF.” NOISE LIMITER switch at “OFF.” TONE control at “HIGH”. Top and bottom vimw* of thm rmcmivmr locating slugs, padd

5、mrs and trimmer DUMMY ANT. CONNECTION OF IN SERIES SIG GENERATOR SIGNALGEN. WITH SIG. OUTPUT TO WENC GENERATOR RECEIVER SETTING None Stator plates of 45 5 kc center sect, of tuning gang BFO ADJUSTMENT-NOTE: Turn off Sig. None Stator plates of 45 5 kc center sect, of tuning gang BAND #4 ADJUSTMENT-NO

6、TE: STANDARD “Al” on antenna 36 me RMA Dummy strip 18 me BAND SWITCH SETTING RECEIVER DIAL SETTING ADJUST SLUG, PADDER. OR TRIMMER NO. DESCRIPTION IF ADJUSTMENT 1000 kc 3 (both) 2 (both) I (both) TYPE OF ADJUSTMENT MAKE ADJUSTMENT STEP FOR: NO. Maximum output Maximum output Maximum output Repeat ste

7、ps 1, 2 and 3 Gen. 400 cycle modulation; set CW/AM switch at “CW”; remove Pitch Control knob adjust slotted screw shaft. _ “1” 1000 kc T-17 slug BFO slug Zero heat A (See Fig. 3 for location) Make sure 400 cycle audio modulator is turned on; AM/CW switch should be at “AM. 36 me C-19 18 me 8 36 me tC

8、-l 36 me fC-12 18 me *ts 18 me *t5 STANDARD “Al” on antenna RMA Dummy strip BAND #3 ADJUSTMENT 14 me C-20 Osc. Trimmer Osc. Slug RF Trimmer Mix.Trimmer RF Slug Mix Slug Osc. Trimmer Osc. Slug RF Trimmer Mix. Trimmer RF Slug Mix. Slug Maximum output Maximum output an*d repeat step 5 Maximum output Ma

9、ximum output Maximum output and repeat step 7 Maximum output and repeat step 8_ Maximum output .11 Maximum output and 12 repeat step 11 Maximum output 13 Maximum output Maximum output and 14 repeat step 13 15 Maximum output and 16 repeat step 14 STANDARD “Al” on antenna RMA Dummy strip BAND 2 ADJUST

10、MENT 5 me “2” 5 me C-21 Osc. Trimmer Maximum output 17 3 me 3 me * 11 Osc. Slug Maximum output and repeat step 17 18 5 me 5 me C-3 RF Trimmer Maximum output 19 5 me 5 me C-14 Mix. Trimmer Maximum output 20 STANDARD “ A1 on antenna RMA Dummy strip 48 BAND 1 ADJUSTMENT 1500 kc 1500 kc C-22 Osc. Trimme

11、r Maximum output 21 600 kc 600 kc C-2 5 Osc. Padder Maximum output and repeat step 21 22 1500 kc 1500 kc C-4 RF Trimmer Maximum output 23 1500 kc 1500 kc C-15 Mix. Trimmer Maximum output 24 *It may be necessary to repeat the indicated adjustments several times. fRock the main tuning capacitor slightly (turn back and forth) when making these adjustments. 收音机爱 好者资料库 RadioFans.CN