Noblitt-Sparks-Industries-Inc-361TFM 电路原理图.pdf

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1、I2AT7 I2BA6 *1 I2BA6*2 1918 MANUAL OF 19S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS ARVIN RADIOS, MODELS 360TFM AND 361TFM CHASSIS RE-260, 6 TUBE AC-DC, AM-FM MANUFACTURED BY NOBUTT-SPARKS INDUSTRIES, Inc., COLUMBUS, INDIANA 5 S8* Alignment facts are given on page 98. -C -K- 8a I 5 i S; M M M M e- n cv; O n

2、 eg w O oo g It i + 1* f 2 S s S s g-g l f SSZ 2 JS s e? s o c O 5,2 % I a o % &S e O .S3-S-a S-S O.e _ o a w O c 3 3 C .y, W) ji O . c c c caB* *3 2 S 8 3 jr Ss 4 4 9 v * tOti *3 4) 4) S C S O w D *2 n o I O I O i O (_ z| v5 *“-_ | 8 8 8 8 8 8 8 8 18 8 8 8 g g 1 5 W. MM n n o S OOOOOFF rH _. _ _ M

3、*. M M M I * , C N Oi rH 0. o 0 w C C M Cl OJ if) rH - 1C t-H I-H.M ID 41 * 8 I JO 0 * * rH | O: o o I o si 11 3 L s *! * ill S I I 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS ARVIN RADIO Models 360TFM and 361TFM, Chassis RE-260 AM 1. Plug set into 117 V. power source, tur

4、n volume control full on and band switch to AM, (left). 2. Connect output meter across speaker voice coil. 3. Connect signal generator high side through .05 mfd. condenser to converter grid and generator ground lead t receiver floating ground. Open tuning condenser, ator to test loop. Set signal gen

5、erator to 1630 Ke. Tune trimmer A5 on oscillator section of tuning con denser for maximum output. 4. Close tuning condenser and set pointer at end mark of dial. Open tuning condenser. Connect signal gener ator to 1650 Ke. Tune trimmer A5 on oscillator section of tuning condenser for maximum output.

6、5. Set signal generator to 1400 Kc. Adjust tuning shaft until maximum output is obtained. Tune antenna trimmer A6 on tuning condenser for greatest output. Reset tuning shaft until output is again a maximum. Retune antenna trimmer. Repeat this cycle of opera tions at 1400 Kc until no further increase

7、 of output can be obtained. Keep generator output at a low value to prevent detuning by A. V. C. action. 6. Set signal generator to 600 Kc. Adjust tuning shaft for maximum output. Adjust tuning condenser plates for maximum output. 7. (.heck sensitivity at 1000 Kc. If sensitivity is too low, tuning c

8、ondenser plates can be adjusted for tracking at this frequency. If this adjustment is made, tracking at 600 Ke must be readjusted. 8. Check coverage and calibration after alignment. Coverage should include 535 and 1650 Kc. Calibration should be such that pointer covers some part of calibra tion mark

9、. If coverage and/or calibration are not correct, plates of tuning condenser can le adjusted. Calibration check points are 1400 1000 600 and 540 Kc. If oscillator plates are adjusted, tracking of antenna section must be rechecked and corrected if necessary. 9. Check setting of trimmers on tuning con

10、denser. Trim mer adjustments must not lie extremely tight nor so loose as to be noisy or vibrate. 10. After alignment, check for noise due to condenser plates touching or pointer touching dial as tuning shaft is turned through the full tuning range. 11. The sensitivity of this set should be approxim

11、ately 500 uv/m with 400 cycles, 30% modulation and 200 milli watts, (.8 volt output. FM 1. Turn band switch to FM, (right). 2. Connect (FM) I.F. generator to the second 12BA6 I.F. amp. grid, (lug #T) through the .01 uf mica dummy. ALIGNMENT PROCEDURE Connect oscilloscope across volume control. With

12、150 Kc deviation 10.7 on the I. F. generator and the same audio voltage used as horizontal sweep on the scope, adjust the ratio detector transformer slugs A7-A8 for the characteristic 4S” curve (See Fig. 1), with maximum vertical height on the scope. After this adjustment the top slug of the ratio d

13、etector should not be moved during the rest of the alignment. 3. Connect I.F. generator to mixer grid through .01 mica dummy. Using 23 Kc deviation 10.7 Me adjust 10.7 Me I. F. transformer slugs A9, A10, All and A12 for maximum output. Maximum output may be indicated by maximum vertical height on th

14、e scope or maximum voltage on a standard output meter across the voice coil of the receiver. After the two I.F. trans formers have heen aligned the bottom slug A8 of the ratio detector should also be peaked. The characteristic “S” curve of the complete I.F. channel should be cheeked by applying a 10

15、.7 Me signal with 150 Kc deviation to the mixer grid and observing the “S” curve on the scoke. It should not be very much different from that observed in step 2. 4. Connect R.F. (FM) generator (88 to 108 Me) to the antenna terminals through the standard 300 ohm dummy (150 ohm in each side of generat

16、or leads). Use R.Fajenerator with 23 Ke deviation. With the variahle condenser completely open arid S.G. tuned to 108.5 Me adjust oscillator trimmer A13 small ceramic trimmer) for maximum reading on output meter. Then tune receiver to low end of band (variable com pletely closed) and S.G. to 87.5 Me

17、. If the receiver does not tune to this frequency the FM oscillator coil L4 will either have to be squeezed together or length ened to cover the band, (squeezing lowers and lengthen ing raises the frequency). Any change in the coil will have to be compensated by the trimmer at the high end ot the ba

18、nd. 5. With the same S.G. connections as per paragraph 4 tune S.G. and set to 105 Me. Tune R.F. trimmer A14 for maximum output at the same time rock variable back and forth through the frequency. (Rocking -s necessary because slight oscillator pulling causes er roneous maximum readings). Tune S C. a

19、nd set the 90 Me. Adjust R.F. coil L3 length for maximum output by squeezing or lengthen ing. Any change in the coil will have to be compen sated at 105 Me by the R.F. trimmer A14. 6. After steps 4 and 5 are finished check calibration and band coverage Steps 4 and 5 may have to be repeated it set is off calibration. Band coverage should be 87 5 Me to 108.5 Me. Sensitivity should be approximately 200 uv at 105 Me, 98 Me and 90 Me. y 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN