R-390A_Final_engineering_report_1953.pdf

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1、SECURITY INFORMATION - RESTRICTED RESTRICTED Introduction This project was initiated to fill a gap in the documentation that was electronically available for the R-390A receiver. In March, 1999, Bill Hawkins scanned the document into an ASCII character-based file and re- produced the content. I scan

2、ned in and added the readable sketches from among the 74 figures in the document. Many of the figures were unusable because the originals were photographs with very poor registration. The document was then formatted using Windows “Courier” font (bold) in MS Word and transferred to an Adobe Acrobat P

3、ortable Document Format (“.pdf”). Bill, as others have, has left in all of the original errors as a tribute to an unknown typist at the Collins Radio Company . Known errors include: Page 1, 4th paragraph -“these equipments” is as written. This style is used throughout the document. Page 7, 5th parag

4、raph - “layed out” is as written Page 8, 1st paragraph - “layed out” is as written Page 14, 3rd paragraph - hazzard is as written Page 15, first line - apprximately is as written Page 18, 3rd paragraph - “minumum” is as written Page 21, 2nd paragraph - “accommodate” is as written Page 30, 1st Paragr

5、aph - “pehnolic” is as written Page 35, 4th paragraph - “curcuit” is as written Page 36, 1st paragraph - “Corp” is as written Page 37, 4th paragraph - “lenthly” is as written Page 42, 8th paragraph - “aggrevated” is as written Page 47 3rd paragraph - “montstrocity” is as written Page 52, last paragr

6、aph - “abondoned” is as written Page 61, 9th paragraph - “consistant” is as written Page 69, 3rd paragraph - “mocrophonics” is as written Page 74, 3rd paragraph - “mocrovolts” and “coupled into the ground” are as written Page 80, 1st paragraph - “extention” is as written If there are other errors th

7、at need to be pointed out, or if I have introduced new errors, I would like to know about then so that I can document them or correct them. The original security classifications and warnings have been retained, even though the document was declassified in the mid-1960s. 1999-April-18 Al Tirevold WAH

8、QQ 1999-May-01 - Minor text corrections made SECURITY INFORMATION - RESTRICTED RESTRICTED CER No. 297 FINAL ENGINEERING REPORT ON RADIO RECEIVERS R-389( )/URR AND R-390( )/URR SEPTEMBER 15, 1953 Object: Development of Low and Medium Frequency Radio Receiver Signal Corps Cpntract No. W36-039-sc-44552

9、 Signal Corps Specification - SCL-1134-B Department of the Army Project No. 3-24-01-051 Signal Corps Project No. 15-805G-2 Placed by U.S. Army, Signal Corps Engineering Laboratories, Fort Monmouth, New Jersey This document contains information affecting the national defense of the United States with

10、in the meaning of the Espionage Laws, Title 18, U.S.C., Sections 793 And 794. The transmission or the revelation of its contents in any manner to an unauthorized person is prohibited by law. PREPARED BY: APPROVED BY: /s/ L. W. Couillard /s/ unreadable _ _ Project Engineer Director of Engineering and

11、 Research Division A PUBLICATION OF THE RESEARCH AND DEVELOPMENT LABORATORIES COLLINS RADIO COMPANY Cedar Rapids, Iowa SECURITY INFORMATION - RESTRICTED RESTRICTED TABLE OF CONTENTS Sections Title Page 1.0 Purpose . . . . . . . . . . . 1 2.0 Abstract . . . . . . . . . . 1 3.0 Publications . . . . .

12、. . . 4 4.0 Factual Data . . . . . . . . 4 5.0 Conclusions . . . . . . . . . 78 6.0 Recommendations . . . . . . . 79 7.0 Identification of Personnel . 80 SECURITY INFORMATION - RESTRICTED RESTRICTED LIST OF ILLUSTRATIONS Figure Title Page 1 Typical Frequency Systems 2 Radio Receiver R-389/URR Final

13、Mixing Diagram 3 Radio Receiver R-390/URR Block Diagram of R-F Unit 4 Radio Receiver R-389/URR Front View 5 Radio Receiver R-390/VRR Front View 6 Radio Receiver R-389/URR Rear View 7 Radio Receiver R-389/URR Top View - Shield Removed 8 Radio Receiver R-389/URR Bottom View 9 Radio Receiver R-389/URR

14、Front View - Panel Removed 10 Radio Receiver R-389/URR Front View - Unit Removed 11 Radio Receiver R-389/URR Bottom View - Unit Removed 12 Radio Receiver R-389/URR R-F Unit - Rear View 13 Radio Receiver R-389/URR R-F Unit - Bottom View 14 Radio Receiver R-389/URR Gear Train 15 Radio Receiver R-389/U

15、RR R-F Coil 16 Radio Receiver R-390/URR Rear View 17 Radio Receiver R-390/URR Top View 18 Radio Receiver R-390/URR Top View - Shield Removed 19 Radio Receiver R-390/URR Bottom View 20 Radio Receiver R-390/URR Front Panel Removed 21 Radio Receiver R-390/URR Panel and Units Removed 22 Radio Receiver R

16、-390/URR Bottom View - Units Removed 23 A-C Power Supply - Top View 24 A-C Power Supply - Bottom View 25 28 Volt D-C Power Unit 26 Audio Unit - Top View 27 Audio Unit - Bottom View 28 I-F Unit - Top View 29 I-F Unit - Bottom View 30 B.F.O. Unit 31 I-F Coil 32 Crystal Filter 33 Antenna Relay Unit 34

17、Antenna Relay - Cover Removed 35 Radio Receiver R-390/URR R-F Unit - Oblique View 36 Radio Receiver R-390/URR R-F Unit - Rear View 36A Radio Receiver R-390/URR R-F Unit - Bottom View ii SECURITY INFORMATION - RESTRICTED RESTRICTED LIST OF ILLUSTRATIONS (Cont.) Figure Title Page 37 Radio Receiver R-3

18、90/URR R-F Chassis 38 Radio Receiver R-390/URR R-F Gear Train 39 Radio Receiver R-390/URR Antenna Coil 40 Radio Receiver R-390/URR R-F Coil 41 Crystal Oscillator - Top View 42 Crystal Oscillator - Oven Removed 43 Calibrator Unit - Top View 44 Calibrator Unit - Bottom View 45 Radio Receiver R-389/URR

19、 VFO 46 Radio Receiver R-389/URR VFO - Cover Removed 47 Radio Receiver R-390/URR VFO 48 Radio Receiver R-390/URR VFO - Cover Removed 49 Table Cabinet 50 Table Cabinet - Collapsed 51 A-C power Diagram 52 Dynamotor Filter Circuit 53 115 Volt D-C Inverter 54 115 Volt D-C Rotary Supply 55 Line Audio Cir

20、cuits 56 Audio Response Curves 57 I-F Unit Block Diagram 58 I-F Transformers 59 Crystal Filter Circuit 60 Interstage I-F Transformer 61 Radio Receiver R-389/URR Trial Mixing Diagrams 62 Radio Receiver R-389/URR Trial Mixing Diagrams 63 Radio Receiver R-390/URR Antenna Input Circuit 64 Second Crystal

21、 Oscillator 65 Crystal Oscillator Coil 66 AGC Circuit 67 Carrier Meter Circuit 68 Radio Receiver R-390/URR VFO Temperature Curve 69 Noise Limiter Circuit 70 Radio Receiver R-390/URR VFO Transformer 71 Radio Receiver R-389/URR Mechanical System 72 Radio Receiver R-390/URR Mechanical System 73 Radio R

22、eceiver R-389/URR Schematic 74 Radio Receiver R-390/URR Schematic iii SECURITY INFORMATION - RESTRICTED RESTRICTED 1.0 PURPOSE This report covers all of the work done on the Signal Corps Develop- ment Contract W36-O39-sc-44552 which resulted in the development of the Radio Receivers R-389( )/URR and

23、 R-390( )/URR as specified in SCL-1134-B. The Signal Corps has plans for the development of a series of radio receivers which would provide reception over the frequency range of 15 kilocycles to 3000 megacycles. The receivers covered by the specification SCL-1134-B are two of this series and cover t

24、he frequency ranges 15 kc to 1500 kc and 500 kc to 32 mc. The purpose of this project was to develop and build three models of each of these receivers along with their required accessories. These receivers would fulfill many needs of the Armed Forces but in general there were two basic requirements.

25、 First, to provide the increased stability and calibration which is becoming almost a necessity in modern communication systems; and second, to combine into one general purpose re- ceiver as many as possible of the facilities and special circuitry that are now being used by the various branches of t

26、he Army and which now require many different receivers to provide. Along with these receivers were de- veloped accessories such as special power supplies and cabinets. There were also instruction books prepared and a complete set of manufacturing drawings. Throughout this program a great deal of eff

27、ort was made to use the very best and latest types of components and materials. Also very close contact was maintained with the Signal Corps Engineering Laboratories to fit these re- ceivers into their very latest plans for communication systems. The purpose and responsibilities of this development

28、project were doubly emphasized when, after the first two engineering models were sub- mitted, a contract for production quantities of both R-389 and R-390 re- ceivers was received by Collins Radio Company. In addition, a second company, Motorola, was set up as a directed subcontractor for a large qu

29、antity of R-390 receivers. These production contracts resulted in serious responsibilities being placed on the development work, since both labor and factory space commitments were made by both companies. During the latter part of the development program, a great deal of time and effort was diverted

30、 from development to production, thus aiding production but delaying the final phase of the development program. Therefore, during the latter phases of this contract, the objective was not only to develop these equipments as specified, but also to aid and ensure the delivery of production quantities

31、. 2.0 ABSTRACT This section contains a brief resume of the report to follow empha- sizing the difficulties encountered and the progress made. The report covers the work done in fulfillment of the development contract for the R-389 and R-390 receivers. Although it is divided into 1 SECURITY INFORMATI

32、ON - RESTRICTED RESTRICTED seven sections, the main body information is contained in the section on Factual Data. The Factual Data section is divided into three main tasks covering the Planning, Models, and Final Report. The Planning Section covers the work done before any actual model building coul

33、d be started. This was actually a very important stage and took considerable time, mostly spent on the RF sections, The main problems here were spurious responses due to the complicated mixing scheme required for stability. The final performance of the equipment did not meet the desired 80 db level,

34、 but was still better than previous equipment and satisfactory to the Signal Corps. The Model Building Section contains a detailed description of all the development work done on this contract and is divided into and covers various topics much the same as the equipment is divided into sub-units. The

35、se topics are as follows: 1. Mechanical Design This covers the basic structural layout and mechanical drive systems. The drive systems for both receivers were the most difficult of the mechanical design problems. A great deal of time was spent in working out gear trains and mechanical drives which w

36、ere not only easy to maintain but also as rugged as possible. The systems finally used are much more complicated than similar receiving equipment but were the best means possible to accomplish the tuning required. 2. Power Circuits This covers the design factors and performance of all three dif- fer

37、ent power units and their associated circuits. The electronic regu- lator design was the biggest problem due to the requirement for a plus or minus 15% input voltage, but was finally satisfactorily overcome. The external 110 volt DC supply also required a lot of time since so many different systems

38、were tried. The rotary machine finally shipped on the contract seemed to be the best compromise for this unit. 3. Audio Circuits This covers the design of the audio circuits and their per- formance. The main problems were the filter and metering circuits which were overcome without too much difficul

39、ty. 4. IF Circuits This covers the design of the IF circuits giving detailed design of various transformers. This section is rather long since the IF per- formance was considered as one of the major features of this equipment. The main problem in the IF was to get the desired bandwidths and to hold

40、good performance under temperature and humidity. The IF bandwidths turned out quite satisfactorily, but the temperature and humidity problem was not completely resolved. 2 SECURITY INFORMATION - RESTRICTED RESTRICTED 5. RF Sections This covers the development of the R-389, R-390 RF sections in- clud

41、ing the R-390 crystal unit. The RF units were undoubtedly the most difficult to design of the entire equipment since they include both mechanical and electrical problems. The electrical difficulties included sensitivity, spurious responses and mixer design. All of these problems have been worked out

42、 satisfactorily. 6. Variable Oscillator Designs This covers the BFO and VFO design for both the R-389 and R-390. The main problem in all of these oscillators is stability which came out rather good although further improvement is being considered. 7. Crystal Calibrator This covers the design of the

43、100 kc crystal calibrator unit in which the main problem was the multi-vibrator performance. This is now considered satisfactory except for the possibility of circuit aging which will be investigated during production. 8. Special Circuits This covers the work done on special circuits such as the AGC

44、 system, noise limiter and others. No major problems were involved in these special circuits. To complete this work it has taken approximately 30,000 engineering man hours implemented with laboratory technicians and drafting help. This work has been spread over a three-year period with the delivery

45、schedule as follows: Project Started June, 1949 R-390 No. 1 January, 1951 R-389 No. 1 March, 1951 R-390 No. 2 September, 1951 R-389 No. 2 February, l952 R-390 No. 3 February, 1952 R-389 No. 3 May, 1952 Miscellaneous Accessories February, 1953 Final Report August, 1953 3 SECURITY INFORMATION - RESTRI

46、CTED RESTRICTED The accessories and later items required by this contract which in- clude drawings and final report, have been delayed considerably, due to the efforts being made to meet production schedules for some of these same equipments. In general, this report has stressed only the new and imp

47、ortant points of this work and has left many of the lesser details to the monthly reports and instruction books. For a more complete record of this program, the other publications should be consulted. 3.0 PUBLICATIONS The following is a list of publications which are directly concerned with this project and may be used to supplement this report: