Reception-Set-AEW1-NZ 电路原理图.pdf

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1、NZVRS PO Box 13873 Onehunga Auckland 1643 Zl/ZA. 30006 RECEIVERS, BROADCAST, NEW ZEALAND TYPE B, NO. 1. WORKING INSTRUCTIONS AND SERVICE RULLETIN I d RECEPTION SET, A.E.W.1, (N.Z.) RECEPTION SET, A.E.W.l (N.Z.) 1 TECHNICAL DETAILS CONTENTS Section. 1. General Description 2. Valve Complement . 3. Tec

2、hnical Summary -.- 4. Mechanical Specifications 5. Aerial-Ground Requirements 6. Installation 7. Circuit Description 8. Operating Instructions 9. Performance Data 10. Alignment Data Tables, 1. Table of Condenser Values 2. Table oi Resistor Values 3. Table of Inductances, Chokes, and Transformers 4.

3、Table ol Switches 5. Table of Valves Plates. 1. General View of AEWI St n 2. Installation Material 3. Operating Controls 4. Top View of Chassis 5. Underneath View oi Ch*iis Figures. 1. Diagram of Typical Installation 2. Schematic Diagram Page 4 4 4 5 5 5 7 10 12 13 18 21 22 23 24 2 6 11 14 17 25 REC

4、EPTION SET, A.E.W.l (N.Z.) 1. General Description. 1.1 The AEW1 Receiver is designed for entertainment and educational purposes. Basic features are, high sensitivity and ease of instal- lation and operation, making it suitable for use by semi-skilled or unskilled personnel. 1.2 2.Valve Complement. S

5、chematic Reference VIA V2A V1B V3A V4A Commercial Type 6U7G 6K8GT 6U7G 6Q7GT 6V6GT Purpose R.F. Amplifier Mixer I.F. Amplifier 2nd Detector, 1st Audio 2nd Audio (Output) V) 3. Technical Summary. 3.1 Electrical Characteristics. The AEW1 Receiver is a supehetrodyne with self con- tained vibrator opera

6、ted H.T. power supply. 3.2 Frequency Ranges. Band Frequency B.C. 550 to 1600 Kilocycle.- SW1 6 to 12 Megacycles SW2 12 to 17 Megacycles SW3 16 to 24 Megacycles I.F. Frequency 455 kilocycles. 3.3 Power Supply Requirements. The receiver is operated by 6 volt D.C. from an accumulator, the current consu

7、mption being 5 amps. 3.4 Output Impedances. 500 ohms for one Loudspeaker. 250 ohms for two Loudspeakers connected in parallel. 3.5 Power Output. 2.5 waits measured in a non inductive load. 3.6 Loudspeaker. The Loudspeaker is a 500 ohm impedance Permanent Magnet Dynamic type, and is fitted with a 50

8、ft. lead. 4. Mechanical Specifications. Dimensions Length Depth Height Weight (Ibs.) Receiver 14i 10 Loudspeaker 13 5. AerialGround Requirements. 5.1 An aerial consisting of 100 ft. of insulated v/ire and two insulators is supplied with each receiver, aerial should be erected as shown in figure 1. 5

9、.2 25 ft. of Insulated (rubber covered) v/ire and a ground spike are supplied with each receiver ior ur:o as a ground, connection. The receiver should be connected to the ground spike in accordance with figure 1. With battery operated equipment a good ground connection is necessary for best results.

10、 5.3 V/hile aerial equipment is supplied witheach receiver this does not preclude the pO3ibiiity of the receiver being used with any other type of aerial, preferably having a minimum length of 50 ft. overall. G. Installation. 6.1 Two AEW1 Receivers, Loudspeakers, and se aerial-ground accessories are

11、 shipped per case. 6.2 The Batteries, 6 volt Accumulators 85 A.H., are shipped in a charged condition, but without electrolyte. 6.3 The receivers are shipped with the valves installed. 6.4 Erect aerial-ground system as shown in figure 1, making sure that the connections to the receiver terminals and

12、 to the ground spike are tight. 6.5 Connect Loudspeaker or Loudspeakers to appropriate terminals on the receiver. 6 .6 Fill the Batteries until the plates are just covered with sulphuric acid diluted with distilled water until the specific gravity is 1.33. Full charging details are given on each bat

13、tery box lid. 6.7 Connect the receiver to a Battery (6 volts) making sure that the positive lead (red) is connected to the battery positive ( + ) (red) and that the other lead is connected to the battery negative () (black). 5 PLATE II. 7. Circuit Description. 7.1 The schematic diagram of AEW1 is sh

14、own in figure 2, on page 25. 7.2 The aerial terminal of the receiver is connected to the appropriate aerial coil primary winding, depending on the wave range selected, by switch S1A, and the appropriate seconday of the aerial coil is connected l.o the control grid of VIA by switch section S2A/2. Swi

15、tch section S2A/1 short circuits the unused secon- daries and. the secondary in use is tuned by condenser CIA. By means of contacts on section S2A/2 con- denser C2A in parallel with condenser C3A, is con- nected in series with the tuning condenser CIA when wave band SWI is being used. Condenser C2A

16、only is connected in series with CIA when wave band SW2 or SW3 is being used. The trimmer condensers for the B.C., SWI, SW2, SW3 coils are C4D, C4C, C4B, and C4A respectively. The tuned circuit radio frequency return is provided by condenser C5A. 7.3 VIA is a screen grid R.F. Amplifier. The anode of

17、 VIA is connected to the appropriate primary, depend- ing on the wave band being used, by switch section SIB. The appropriate secondary is selected by means of switch S2B/2, and is tuned by condenser GIB. The unused secondaries are short circuited by switch section S2B./1. When wave band SWI is bein

18、g used condenser C2B in parallel with condenser C3B is connected in series with the tuning condenser C1B. When SW2 or SW3 are being used condenser C2B only is connected in series with condenser C1B. The trimmer condensers for the wave bands B.C., SWI, SW2 and SW3 are C4H, C4G, C4F, and C4E respectiv

19、ely. The return end of the secondaries is bypassed to R.F. by condenser C5B. 7.4 Valve V2A is a hexode-triode, mixer-oscillator. The triode portion of this valve is used as a high fre- quency oscillator, a tuned anode oscillator circuit being employed. The triode anode is connected to the appropriat

20、e oscillator coil secondary by switch section S2C/2. When wave band SWI is being used, condenser C2C in parallel with condenser CSC, is connected in series with the tuning condenser C1C. When SW2 or SW3 are being used condenser C2C only is connected in series with C1C. 3i O .0- -C ; 2VO, I ,UJ K O /

21、( Wl .-30 * CX. is- z m LJ FIGURE I. The trimmer condensers for the wave bands B.C., SW1, SW2 and SW3 are condensers C4L, C4K, C4J and C4I respectively, and the padding condensers are: B.C. Band C13A in parallel with C12B SWI Band C11A in parallel with C12A SW2 Band C10A SW3 Band C9A C8B and R5A are

22、 the anode coupling condenser and anode feed resistor respectively. The triode grid is connected to the appropriate reac- tion winding by switch section SIC. Condenser C8A and resistor R3A are the grid condenser and leak respectively. The anode of the hexode portion of the valve is con- nected to th

23、e primary of LISA which is tuned by condenser C16A. Screen grid potential is obtained from main H.T. through dropping resistor R6A, and the screen grid is bypassed to R.F. by condenser C7A. Valve V2A obtains its bias from the voltage drop developed across resistor R4A which is bypassed to R.F. by co

24、ndenser C6B. 7.5 The secondary of the I.F. transformer LISA tuned by condenser C16B is connected to the control grid of the I.F. amplifier V1B. The anode of V1B is connected to the primary of I.F. transformer L13B the primary being tuned by C16C. Screen grid potential for VIB is obtained through dro

25、pping resistor R6A from H.T. positive and the screen grid is bypassed to R.F. by condenser C7A. The cathode bias is obtained by the voltage drop across resistor RIB and the cathode is bypassed to R.F. by condenser C6C. The signal from the secondary of L13B, tuned by con- denser C16D is fed to one di

26、ode anode of V3A. 7.6 Valve V3A is a duode-diode triode, one diode portion of which is 2nd detector (demodulator), and the triode portion, the first audio amplifier. The other diode portion is used to supply AVC voltage to the control grids of VIA, V2A and VIB. The R.F. signal is supplied to this la

27、tter diode through condenser C8D and the D.C. voltage developed across R8B is fed to the control grid of V1B and V2A by resistor R8A, and to valve VIA by resistor R8A in series with decoupling resistor R2A. The audio voltage appearing across the diode load resistor R7A is filtered for R.F. by resist

28、or R3B and condenser CSC and C17A, and is applied through isolating condenser CIS A to the volume control potentiometer R11A. The centre arm of the volume control is connected by isolating condenser C18B to the control grid of the triode portion of V3A. Grid bias for V3A is obtained by contact poten

29、tial voltage developed across the high resistance R10A. The anode of V3A is bypassed to R.F. by condenser C8E and is connected by coupling condenser C18C to the control grid of valve V4.A. The anode of V3A obtains its H.T. potential through load resistor R2B from the main H.T. positive. 7.7 Valve V4

30、A is a beam tetrode output valve. It obtains its bias by the voltage drop across R12A which is bypassed to audio frequency by condenser C20A R7B is the grid leak. The anode of V4A is connected to the primary of the output transformer T2. The secondary of this output transformer is tapped to provide

31、500 and 250 ohms output impedance. Screen potential for V4A is obtained directly from the H.T. positive. The anode is bypassed to R.F. by condenser C15D, while C6D and. R9A comprise the tone control system. 7.8 Power supply: 6 volts from the battery is applied through swith S4A and radio frequency c

32、hoke LI 4A to the centre tap of the primary of transformer Tl. Condensers C14A, C14C and condensers C15A and CISC in conjunction with R.F. choke LI4A comprise the R.F. filter. The primary circuit of transformer Tl is interrupted by contacts on the vibrator producing an A.C. voltage in the secondary

33、of transformer Tl. This secondary, however, is also interrupted by contacts on the vibra- tor, so that rectification takes place producing a D.C. potential between the centre tap of the secondary and chassis. The H.T. voltage is filtered for R.F. by choke LI5A, condenser C7B and condenser C14D and t

34、he L.F. filtering is accomplished by reactor LI6A and electrolytic condensers C19A and C19B. The H.T. output is also bypassed to R.F. by condenser C7B. 7.9 The vibrator which is of the 12 volt type, has been especially adjusted to operate on 6 volts and cannot be replaced with a 6 volt vibrator. 8.

35、Operating Instructions. 8.1 Turn BATTERY SWITCH to ON position. 10 ,p o PLATE 111. 11 8.2 Set WAVE BAND SWITCH to band desired. 8.3 Set VOLUME CONTROL about half on. 8.4 Turn TUNING CONTROL until the dial pointer indi- cates the desired frequency. 8.5 Search about this point until the wanted station

36、 IK heard. 8.6 Tune exactly to the centre of the station signal, otherwise reception will be noisy and/or distorted. 8.7 Adjust the VOLUME CONTROL, for suitable volume. 8.8 Adjust TONE CONTROL for most pleasing tone, remembering that speech is most intelligible of the control is in the high pitched

37、position. 9. Performance Data. 10 Alignment Data. 10.1 General. 9.1 9.2 9.3 Overall sensitivity: The following is a table of the sensitivity expressed in microvolts, modulated 30% at 400 cps. R.F. input, when using 400 ohm non-inductive resistor as a dummy aerial and to deliver 500 milliwatts (j wat

38、t) to a 500 ohm non-inductive resistor connected across the one speaker output terminals. It will be noted that in Section (10) the loudspeaker is used as the output load, its impedance at 400 cps being suffi- ciently close to 500 ohms for alignment purposes. Band 1600 to 550 kilocycles 6 to 12 mega

39、cycles 12 to 17 megacycles 16 to 24 megacycles Microvolts 58 1520 1520 1520 I.F. Sensitivity. The I.F. sensitivity of the receiver is such that 70 microvolts, modulated at 400 cps to a depth of 30%, applied between the control grid of valve V2A and chassis will deliver 50 milliwatts in a non-inducti

40、ve resistance of 500 ohms connected across the one speaker output terminals. It v/ill be noted that in Section (10) the loudspeaker is used as the output load, its impedance at 400 cps being sufficiently close to 500 ohms for alignment purposes. Power Output. The receiver delivers a power output of

41、not less than 2.5 watts to a non-inductive resistance of 500 ohms connected across the one speaker terminals, the measurement being made at a frequency of 400 cps. 12 i I i * * * r . -t r - r . -t i -iI 4 i 3 c i * a SOT t ft) I 16 1 - o ri r s. hi r ti rv r *; r- O X O C 17 Table I. TABLE OF CONDEN

42、SER VALUES. Si-hem, Ref. Type CIA ) C1B ) Variable C1C ) C2A Silvered Mica C2B C2C C3A C3B CSC C4A Semi Fixed C4B C4C C4D C4E C4F C4G C4H C4I C4J fMtT Value .00044 mfd. 100 mmfd 100 mmfd 100 mmfd 200 mmfd. 200 mmfd. 200 mmfd. 3-30 mmfd. 3-30 mmfd. 3-30 mmfd. 3-30 mmfd. 3-30 mmfd. 3-30 mmfd. Voltage

43、Tolerance Function. Ganged Tuning Conderer SW3 SW3 and SW3 2% Band-Spread Condenser Aerial Stage, SW1 R F Trimmer 9W9 R.F. Trimmer, SW2 RF Trimmer Wl D p Tnmmrr R C* Detector Trimmer, SW3 Detector Trimmer, B.C. Oscillator Trimmer, SW3 O-.rillntnr Trimmer RW1 and SW2 SW2 n SW1 C4L C5A C5B C6A C6B C6C

44、 C6D C7A C7B C8A C8B CSC C8D C8E C9A C10A C11A C12A ) C12B ) C13A C14A C14B C14C C14D C15A C15B C15C C15D ii u Tubular Paper i u ,i a a a a a n n , u a a Mica H H u It Semi Fixed , , Mica Tubular Paper ,i a , o Q S n in T3 CO H M i g o 3- CO CO 0 N) 33 O Q CO 3 (t c? S *. a in o CO g i O n j * Q O M

45、 9. OT (D n 3 a. CO 5T Q. o co CO .ta N) 33 O S CO 5 (D a CD * a CO g o CO o 1 O 5T o o Q S Secor dai y CO CD t CD O 9 CO CO CO 33 o Q CO 5 (D o3 CD rfx Q co (D o CO CT O 5 o 33 Tl O o -1 ro to o 0 3 a Q 2- f o CO CO O , , 33 O D CO TJ O (D w O 3 tQ CO 3- O r-* Q o * c w ffi o a BT R O o i- CO to 3

46、o 3 3- o r-t- O ri .T C c h-l 2. ro + o 0 o - CO CD O O a Q w CO , , 30 0 Q - CO T) O (I) w O M 5 1C! CO 3- o -l O rt G C en (!) CD M 5 o o co CD 8 P a. Q i- CD C.3 CO O 33 O Q co 5 (Q CD t) O CD * Q O C/l o . Q O * 33 C Q 5 3 J; 5 a. 5 cQ GO CD O Q - C/l 5 6 Q CO 5 (D T3 cT o 0 CD* Q O O o e; 3. R

47、co CD CD o o CO 33 O Q * - co 3 IQ CD C? CD u Q (D Q O y c,l elector n (D 3 Q cr. o o (D P n o H. (0 I 1= 3 n 5 S H W K o ? n g- i C/) H O S w 22 23 Table V. TABLE OF VALVES. VIA V2A V1B V3A V4A 6U7G 6K8GT 6U7G 6Q7GT 6V6GT Screen Grid R.F. Amplifier Hexode-Triode Mixer Oscillator Screen Grid I.F. Am

48、plifier Duo-Diode Triode 2nd Detector 1st Audio Amplifier Beam Tetrode Power Output - NOTE I SIA SIB SIC are the front switch sections in each coil box. S2A/I S2B/I S2C/I are the fronj contacts of the rear switch section in each coil box. S2A/2 S2B/2 S2C/2 are the re,r contacts of the rear switch se

49、ction in each coil box. NOTE 2 Waveband switch shown in the I6QO-55O KC. band position. Shown as viewed from rear of chassis and therefore - o-o- turns anticlockwise 3O for 6-12 MC. and so on. 6 VOLTS NOTE 3 In some receivers R9A is 5meg,C6Cis -OOOSmfd. and is connected to the grid of V4Airistead of to anodeas shown. J_ RECEPTION SET A.E.W I. (NZJ-SCHEMATIC DIAGRAM FIGURE II. i All inside dotted line is in vibrator unit. X box. switch section in each coil box. switch section in each coil box. 5ltlon. _ _ S4A d is nown. IEMATIC DIAGRAM FIGURE 2 FIGUR