BC-669A_D_serv_1956.pdf

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1、u I . . IGNAL CORPS F1EPA1R STAlJl)itD AW.t.-.A.:): J /flve.wtt 1s- PROJECT 44220 rlEPAIRED EQUIPMENT STANffiRD FOR r . DIO HECElVER-TRAfJSMITTER l.C-669-A, B, C, D , R.:-:r . . . I . 1 - NOT TO Be !AiEN FIW1v1 THIS ROOM NO. REP-27 1SSU NO. 3 19 May 1953 SIGNAL CORPS ENGINEERING LABORATORIES FORT MO

2、NMOUTH, N.J. C of1l t Cp - SIGNAL CORPS fiEPAIR STANDARD SIGNAL CORPS REPAIRED EQUIPMENT STANDARD FOR NO. REP-27 ISSUE N0.3 AMENDMENT N0.1 13 November 1956 RADIO RECEIVER-TRANSMITTER BC-669-A-B-C AND D Page 8. IV.C.l., line 2. Change 400 KC to 4000 KC. IV.C.l., line 4. Change sentence as follows: Ou

3、tput current shall be 1.2 amps. min. FNC/mls , . . . . J. . . . Armyp Ft. Monmout h, NJ-MON857-56 1 SIGNAL CORPS REPAm STANDRD NO. REP-27 JSSUE NO. 3 Section L n. rr.A IL B. III. IILA. nr. B. IV. IV. A. IV. B. nr.c. v. TABLE OF CONIENIS Text Preface Statement Covering Applicability . . Applicable Re

4、ferences . . Repair Standards . . . . . . . . . Technical Publications Test and Additional Equipment. Test Equipment Additional Equipment Requirements . . . . General Test Conditions. Receiver Tests Transmitter Tests. . . . . . . . . Page II 1 1 1 1 2 2 2 3 3 4 8 Supersedure. 9 I SIGNAL CORPS REPAm

5、STANORD PREFACE Signal Corps Repair Standards (formerly Signal Corps Repaired Equipment Requirements) are prepared by the Main- tenance Engineering Branch, Procurement-Maintnance Engi- neering Division, Signal Corps Engineering Laboratories, and cover various items of signal equipments which are sub

6、- ject to repair, test and inspection. These repair stand- ards are documents hich set forth the specific repair re- quirements and test standards to be applied to the individ- ual equipments being repaired and tested. Signal Corps Repair Standards are preared for the specific use of the fifth echel

7、on Signal Repair Shops in repairing and determining the quality and acceptability of repaired signal equipments covered by these standards. The use of Signal Corps Repair Standards is recom mended as a guide and reference for any agency having occasion to reair, test or inspect an item of signal equ

8、ipment for wh1ch a repair standard has been prepared. Signal Corps Repair Standard No. REP-1001 is a gen- eral standard and is subsidiary to any individual stand- ard prepared. No individual standard is to be consideed complete in itself, but is to be used i n conjunction with Signal Corps Repair St

9、andard No REP-1001, General Stand- ards for Repaired Signal Equipment. Reports of any discrepancies or any constructive com- ments bearing upon this repair standard are invited. A series of Comments and/or Notes pages will be found in the back of this standard which are designed to facilitate re- po

10、rting any inaccuracies noted. All such reports or com - ments as well as requests for additional copies, should be addressed to: COf1iRI1ANDING GEr EHAL Signal Corps Engineering Laboratories, SIGEL-PMM-3 Fort M onmouth, New Jersey. II SIGNAL CORPS REPAIR STANDRD REPAIRED EQUIPMENT STANORD FOR RADIO

11、RECEIVER-TRANSMITTER OC-669-A, B, C, D I. STATEMENT COVERING APPLICABILI1Y NO. REP-27 :ISSUE NOe 3 This repair standard covers inspection requirements to be used in determining the quality and acceptability of re- paired Radio Receiver-Transmitter BC-669-A, B,C, U Its use is mandatory in the Mainten

12、ance Divisions of Signal Depots and the Signal Sections of General Depotse The use, insofar as limitations of tes and calibration equipment permit, is highly recommended for all Signal Repair organizations. . CAUTION 300 VOL1S II. APPLlCABLE REFERENCES A. Repair Standards. Applicable paragraphs of t

13、he following repair s tanda:rds form a part of this s tandarh Title L General Standards for Repaired Signal Equipment 2. Class C Receiver and Low Power Transmitter Vacuum Tubes 3. Meters Number REP-lOOL REP-242 REP-85 B. Technical Publications. The following technical publication.f6rms a part of thi

14、s standard to the extent referenced herein: Title Radio Set SCR-543-B I Number TM ll-625B Section I SIGNAL CORPS REPAm STANDRD IIT. TEST AND ADDITIONAL EQUIPMENT NO. REP-27 JSSUE NO. 3 The following equipment or suitable equipments of known accurac shall be employed in determining compliance with th

15、e requirements of this Signal Corps Repair Standard and will be capable of conforming to their respective Re- pair Standards: A. Test Equipment Equipment Stock Number Number REP Used 1. Oscilloscope 5-8A/ U 3F3665-B 2. Spectrum Analyzer 1722-5.4 15-723/ U 1 1 3. Signal Generator 3F3820.2 I !Sj588/U

16、4. Transformer, Var-3F8100-3 iable CN-16A/ U 5. Mul.timeter . , TS297jU .! 3F6325-297 1 1 .6. Frequency Meter 2Cl411 . 1 SCR-211 7. Audio Oscillator 3F4325-27 1 IS-382 ( ) / U B. Additional Equipment Equipment Stock Number Number REP Used 1. Headset HS-22( ) 2B822E I 2. Ammeter 3FI0003.18 1 (0-3 AmP

17、 RF) 2 ) SIGNAL CORPS REPAm STANDRD NOo REP-27 JSSUE NO. 3 Equipment Stock Number Number REP Used 3. Power Supply 3H-4997-100D 1 PE-110- ( ) 4. Resistor, fixed, 3Z600l-90 2 10 ohm :!:5% 40 w, non-inductive 5. Resistor, 4000 3Z6400-38 I ohms :1;5%, 5 w, non-inductive 6. Capacitor, 520 309520-2 I nunf

18、, 500 v 7. Capacitor, 50 309055-4 I mmf, 500 v 8o Resistor, 100 3Z6010-198 1 ohms :1:5%. 1/ 2 w non-inductive 9. Key J-45 3Z3445 I IV. REQUIREMEN1S A. General Test Conditions. The following test con- ditions are, in general, applicable to all required tests: 1. All tests shall be performed in a scre

19、ened room. 2. Input voltage to Power Supply Unit PE-110-() shall be 115 v, 60 cycles. 3. Tests shall be made after an equipment warm- up period of approximately 15 minutes. 4. Receiver antenna coupling shall consist of a 10 ohm resistor in series with a 50 mmfd capacitor. 5o Transmitter dummy load s

20、hall consist of a 0-3 amp RF ammeter in series with a 10 ohm resistor and a 50 mmf capacitor. 3 SIGNAL CORPS REPAlll STANJ)RD NO. REP-27 1SSUE NO. 3 6. Tests shall apply to all models except certain tests which only apply to the D model and are so designated. 7. All input signals shall be 30% modula

21、ted at 400 cycles. B. Receiver output shall be measured with a vac- uum tube voltmeter across the 6 ohm,resistor R51 unless otherwise specified. 9. Load resistors for measurement of output across the PHONES terminals for the A, B and C models shall be 100 ohms and for the D model, 4,000 ohms. 10. St

22、andard receiver output shall be 50 mw (550 millivolts across the 6 ohm R51 resistor). B. Receiver Tests 1. Receiver Sensitivity (VOICE, MANUAL and cw MANUAL). Establish a signal-plus-noise-to-noise voltag ratio of 2 to 1. This shall be done in the followig manner: to 1800 kc. ao Tune the signal gene

23、rator and receiver b. Adjust the output of the signal generator and the receiver volume control to produce a 550 millivolt receiver output across the 6. ohm resistor R51. Ibis shall be done in such a way that wth the modulation off the receiver output shall not exceed 275 millivolts. c. This signal-

24、plus-noise-to-noise ratio shall be obtained for each frequency listed in Table I and the modulated signal input shall not exceed the values shown: 4 I SIGNAL CORPS REPAIR S TANl):lRD REPAIRED EQUIPMENT STANm.RD FOR RADIO RECEIVER-IRP.NSMTITER OC-669-A, B, C, D I. STATEMENT COVERING APPLICABILITY NO.

25、 REP-27 JSSUE NO. 3 This repair standard covers inspection requirements to be used in determining the quality and acceptability of re- paired Radio Receiver-Transmitter BC-669-A, B,C, U Its use is mandatory in the Maintenance Divisions of Signal Depots and the Signal Sections of General Depots. The

26、use, insofar as limitations of test and calibration equipment permit, is highly recommended for all Signal Repair organizations. CAUTION 300 VOLIS II. APPLICABLE REFERENCES A. Repair Standards. Applicable paragraphs of the following repair standards form a part of this standarm Title L General Stand

27、ard; for Repaired Signal Equipment 2. Class C Receiver and Low Power Transmitter Vacuum Tubes 3. Meters Number REP-1001 REP-242 REP-85 B$ Technical Publications$ The following technical public,tion f6rms a part of this standard to the extent referenced herein: Title Radio Set SCR-543-B I Number Thl

28、ll-625B Section I SIGNAL CORPS REPAffi STANDRD m. TEST AND ADDITIONAL EQUIPMENT NO. REP-27 lSSUE NO. 3 The following equipment or suitable equipments of known accurac shall be employed in determining compliance with th requirements of this Signal Corps Repair Standard and will be capable of conformi

29、ng to their respective Re- pair Standards: A. Test Equipment Equipment Stock Number Number REP Used 1. Oscilloscope E-BA/U 3F3665-B 2. Spectrum Analyzer 1722-5.4 15-723/ U 3. SignalGenerator 3F3820.2 m;saa;u 4. Transformer, Var-3F8100-3 iable CN-16A/ U 5. Mul.timeter TSf297 /U , : . ; 3F6325-297 1 1

30、 1 1 1 .6. Frequency Meter 2Cl411 . .1 SCR-211 7. Audio Oscillator 3F4325-27 1 15-382 ( )/ U B. Additional Equipment Equipment Stock Number Number REP Used 1. Headset HS-22( ) 2B822E 1 2. Ammeter 3Fl0003.18 1 (0-3 Amp RF) 2 ; I I I SIGNAL CORPS REPADl STANDRD NOo REP-27 lSSUE NO. 3 Equipment Stock N

31、umber Number REP Used 3o Power Supply 3H-4997-100D 1 PE-110- ( ) 4. Resistor, fixed, 3Z6001-90 2 10 ohm :1:5% 40 w, non-inductive 5. Resistor, 4000 3Z6400-38 1 ohms :1:5%t 5 w, non-inductive 6. Capacitor, 520 300520-2 1 mmf, 500 v 7. Capacitor, 50 309055-4 1 mmf, 500 v 8o Resistor, 100 . 326010-198

32、1 ohms :1:5%, 1/2 w non-inductive 9o Key J-45 323445 1 IV. REQUIREMEN1S A. General Test Conditions. The following test con- ditions are, in general, applicable to all required tests: 1. All tests shall be performed in a screened room. 2. Input voltage to Power Supply Unit PE-110-() shall be 115 v, 6

33、0 cycles. 3. Tests shall be made after an equipment warm- up period of approximately 15 minutes. 4. Receiver antenna coupling shall consist of a 10 ohm resistor in series with a 50 mmfd capacitor. 5. Transmitter dummy load shall consist of a 0-3 amp RF ammeter in series with a 10 ohm resistor and a

34、50 mmf capacitoro 3 SIGNAL CORPS REPAm STANDRD NO. REP-27 JSSUE NO. 3 6. Tests shall apply to all models except certain tests which only apply to the D model and are so designated. 7. All input signals shall be 30% modulated at 400 cycles. 8. Receiver output shall be measured with a vac- uum tube vo

35、ltmeter across the 6 ohm, resistor R51 unless otherwise specified. 9. Load resistors for measurement of output across the PHONES terminals for the A, B and C models shall be 100 ohms and for the Dmodel, 4,000 ohms. 10. Standard receiver output shall be 50 mw (550 millivolts across the 6 ohm R51 resi

36、stor). B. Receiver Tests 1. Receiver Sensitivity (VOICE, MANUAL and cw, MANUAL). Establish a signal-plus-noise-to-noise voltage ratio of 2 to 1. This shall be done in the following manner: a. Tune the signal generator and receiver to 1800 kc. b. Adjust the output of the signal generator and the rece

37、iver volume control to produce a 550 millivolt receiver output across the 6 ohm resistor R51. This shall be done in such a way that with the modulation off, the receiver output shall not exceed 275 millivolts. c. This signal-plus-noise-to-noise ratio shall be obtained for each frequency listed in Ta

38、ble I and the modulated signal input shall not exceed the values shown: 4 SIGNAL COOPS REP Am S TANDRD Oper Band TABLE I Freq (kc. NO. REP-27 ISSUE NO. 3 Input Unicrovolts) Voice CV/ Operation Operation Voice Voice 1 2 1800 2200 2700 2900 3600 4400 5 5 5 6 6 6 2. Image Frequency Rejection Ratio 4 4

39、4 4 4 4 a. Set the receiver band switch at MAN 1. Tune the receiver for a 550 mv output at 1800 kc with an input signal of 5 microvolts. Tune the signal generator to the image frequency of 2570 kc and increase the signal strength until receiver output is the same as that obtained with 5 microvolts i

40、nput. The image rejection ratio Receiver Input at 3470 kc -Receiver Input at l800 kc b. Repeat paragraph a above for frequencies of 2700 kc and 4400. with respective signal inputs of 5 and 6 micDovolts and the receiver band switch at MAN 2. c. The image rejection ratios shall be not less than the va

41、lues indicated in Table IL TABLE II :nnage Dnage Band Freq Freq Rejection (kc) (kc) Ratio 1 1800 2570 3500 2 2700 3470 1000 2 4400 5170 400 5 S lGfJf,L CCRPS. 1 llT. S . l.i HdD r c. -.p-27 s:;uE rrc. 3 - 3o Intermediate Freq ency ie jec I, ion 1a tio. lJi th tle sigilal- us-noise-to-noise tat.io ad

42、justed as specified in B- 1 .f.)or 1000 kc, chnnge r,he input f:rom the signal gener- ntor to 2b5 c and increase he signal until asso millivolt httut s obtained from the receiver . The !rejection ratio shall be 1 ot less than 30, 00. 4. n1aximum Undistorted ower Outpt t . et the signal generator for

43、 an output of 100 :c and tune the re- celver to this frequenc Increase output of signal gener- ator and R ElVR V0LUM control tmtil r.1aximum receiver out- put vith less than 5% distortion i s obtained. Tte receiver output across the H51 resistor , for all models, mus t be not less than 2. vci volts

44、and at the PHON output not l ess them 0.84 volts for all models except the For the D model , output at dw PHuNiS termlnals shall be not less than 16. 5 vol t so 5. IF electivity ao Set the receiver t o 1800 kc. Connect the signal generator output thr u a 520 mmf capacitor to the grid of conver ter t

45、ube V2. b. Appl y a signal of 100 microvolts at 385 kc ond adjust the receiver volume control t o obtain 550 m1llivolts output. c. Increase output of signal gene0. icrovolts and adjust signal generator frequency until rece ver output is 550 millivolts. d. Change the f requency of the signal gener- a

46、tor in the opposite direction until receiver output is ti50 mv at 1000 microvolts in ut. e. The difference in the signal generator. frequencies n b and c as measured with Frequency ter J-67( ) / U is tte oandwidth at 1000 microvolts i nput and shall not exceed 10 kco f . epeat J, c, this pnragraph,

47、vith n signal input strenQth of Oo 1 volt. The Hmdwidth at t.1is value o signal in?ut shall not exceed 45 c. , SIGNAL CORPS REPAm STANDRD NO. REP-27 :ISSUE NO. 3 6. BFO zero Beat Adjustment (D.Model Only) a. Set OPERATING CHANNEL switch at 1, RECEIV- ER BAND switch at XTAL 1, CW ffiC switch at ON, SPEAKER switch at ON and tune the receiver to 1740 kc. b. Connect output of signal generator to the grid of the converter tube V2thru a 520 mmfd capacitor. c. Adjust signal generator for an output of 100 microvolts at 385 kc. d. Vary OSC PI1CH control until a zero beat is obtained. Z