AN-PRR-9_serv_TM11-5820-549-50-1_1971.pdf

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1、TM 11-5820-549-50-1 TECHNICAL MANUAL DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST RECEIVING SET, RADIO AN PRR-9 (XE-9) HEADQUARTERS, DEPARTMENT OF THE ARMY FEBRUARY 1971 TM 11-5820-549-50-1 TECHNICAL MANUALHEADQUARTERS, DEPARTMENT OF THE ARMY No. 11-5820-549-50-1WASHINGTON,

2、 DC, 12 February 1971 Depot Maintenance Manual Including Repair Parts and Special Tools List RECEIVING SET, RADIO AN/PRR-9(XE-9) Paragraph Page CHAPTER1.FUNCTIONING OF EQUIPMENT SectionI.Introduction Scope .1-11-1 Indexes of equipment publications .1-21-1 Reporting of equipment manual improvements .

3、1-31-1 II.Functioning of Receiving Set, Radio AN/PRR-9(XE-9) Block diagram, AN/PRR-9(XE-9) .1-41-1 Antennt and rf circuits .1-51-2 Local oscillator .1-61-2 First mixer .1-71-2 I.f. amplifier, 10.7 MHz.1-81-2 Second oscillator .1-91-3 Second mixer and 455 kHz filter .1-101-3 I.f. amplifier, 455 kHz .

4、1-111-3 Limiter and discriminator.1-121-3 Audio circuit.1-131-3 Tone squelch circuit .1-141-3 Power source .1-151-4 Summary of integrated circuit and electronic component connection points .1-161-4 CHAPTER2.DEPOT TROUBLESHOOTING Scope of depot troubleshooting .2-12-1 Organization of troubleshooting

5、.2-22-1 Test equipment required for troubleshooting .2-32-1 Troubleshooting test setup .2-42-1 Troubleshooting chart .2-52-2 Voltage and resistance measurements . 2-62-2 CHAPTER3.DEPOT REPAIRS AND ALINEMENT SectionI.Depot repairs General Parts Replacement Techniques.3-13-1 Removal of AN/PRR-9(XE-9)

6、jack housing assembly .3-23-1 II.Depot alignment Test equipment and special tools required for alinement .3-33-2 Use of Indicator, Channel Alinement ID-1189-(XE-2)/PR .3-43-2 10.7 MHz i.f. alinement .3-53-2 Discriminator alinement .3-63-3 Local oscillator alinement .3-73-3 Squelch sensitivity adjust

7、ment .3-83-3 CHAPTER4.DEPOT OVERHAUL STANDARDS SectionI.General Purpose of final testing .4-14-1 Technical publications .4-24-1 Test facilities required .4-34-1 Test harnesses .4-44-1 Organization of tests.4-54-1 II.Tests AN/PRR-9(XE-9) sensitivity test.4-64-2 AN/PRR-9(XE-9) squelch sensitivity test

8、 .4-74-2 i TM 11-5820-549-50-1 ParagraphPage SectionII.Tests-Continued AN/PRR-9(XE-9) limiting test.4-84-3 AN/PRR-9(XE-9) audio frequency response test .4-94-3 AN/PRR-9(XE-9) audio distortion test.4-104-4 AN/PRR-9(XE-9) dc power consumption test .4-114-4 AN/PRR-9(XE-9) local oscillator and 10.245 MH

9、z oscillator tests.4-124-4 AN/PRR-9(XE-9) i.f. selectivity test.4-134-4 AN/PRR-9(XE-9) discriminator characteristics test.4-144-5 APPENDIXA.REFERENCES.A-1 B.DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST.B-1 ii TM 11-5820-549-50-1 CHAPTER 1 FUNCTIONING OF

10、EQUIPMENT 1-1. Scope a.This manual contains instructions for depot maintenance of Receiving Set, Radio AN/ PRR-9(XE-9) and depot overhaul standards. No direct support (DS) or general support (GS) maintenance is authorized for this equipment. The instructions include functioning of the equipment, tro

11、ubleshooting, repair, alinement, and testing. The manual also lists tools, materials, and test equipment necessary to accomplish the maintenance. b.Operation and organizational maintenance for the AN/PRR-9(XE-9) are covered in TM 11-5820-549- 12-1. 1-2. Indexes of Equipment Publications a.DA Pam 310

12、-4. Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertaining to the equipment. b.DA Pam 310-7. Refer to DA Pam 310-7 to determine whether these are modification work orders (MWOS) pertaining to the equipment. 1-3. Reporting

13、 of Equipment Manual Improvements The reporting of errors, omissions, and recommendations for improving this publication by the individual user is encouraged. Reports should be submitted on DA Form 2028 (Recommended Changes to DA Publications) and forward direct to Commanding General, U.S. Army Elec

14、tronics Command, ATTN: AMSEL-ME-NMPAD, Fort Monmouth, NJ 07703. Section II. FUNCTIONING OF RECEIVING SET, RADIO AN/PRR-9(XE-9) NOTE Reference designations in this section are abbreviated. See schematic diagram, fig. 4-10, for complete reference designations. 1-4. Block diagram, AN/PRR-9(XE-9) (fig.

15、1-1) Receiving Set, Radio AN/PRR-9(XE-9) is capable of receiving a voice-modulated or tone-modulated frequency-modulated (fm) signal within the frequency range of 47 to 57 megahertz (MHz). The specific frequency of operation is crystal-controlled, and a change in the frequency is accomplished by cha

16、nging the internal oscillator crystal. The set has the capability of either un-squelched or 150 Hz tone squelch operation. The signal path is shown in the block diagram (fig. 1-1) and is discussed in a. through f. below. For complete circuit details, refer to the overall schematic diagram (fig. 4-10

17、). a.The AN/PRR-9(XE-9) employs integrated circuits and electronic component assemblies for many of its functions. The rf integrated circuit module Z1 includes circuitry which, with associated external discrete components, performs the function of rf amplifier, first mixer and local oscillator. Z2,

18、the i.f. integrated circuit module, with associated external components, performs the functions of 10.7 MHz i.f. amplifier, second mixer, second oscillator, and 455 kHz, i.f. amplifier. The detector integrated circuit module Z5, with other associated components, provides the limiter, squelch and aud

19、io amplifier functions. Z3 contains diodes, resistors and capacitors of the discriminator circuitry. Z4 contains the 150 Hz notch filter portion of the squelch circuit. For signals or functions of the integrated circuit connection points, refer to the following descriptions and the summary in paragr

20、aph 1-16. b.A signal received in the antenna of the receiver is increased in amplitude by radio frequency (rf) amplifier. The amplifier signal is applied to the first mixer where it is mixed with the output of the local oscillator, which is crystal-controlled. The first oscillator frequency is 10.7

21、MHz below the frequency of the incoming signal, and as a result of mixing, a 10.7 MHz intermediate frequency (i.f.) is developed. 1-1 TM 11-5820-549-50-1 c.The output of the first mixer is then applied to a 10.7 MHz i.f. amplifier where the signal is amplified and applied to the input of the second

22、mixer. The output of the second oscillator, which is crystal-controlled by a 10.245 MHz crystal, is also applied to the second mixer. The mixing of the 10.7 MHz and 10.245 MHz signal results in an output signal of 455 kilohertz (kHz). d.The output of the second mixer is coupled through a 455 kHz i.f

23、. filter, which establishes the major bandpass characteristics of the receiver. The 455 kHz signal is then amplified by the 455 kHz i.f. amplifier and applied to the limiter. e.Proper limiting of the fm signal is accomplished by the limiter stage. Limiting action keeps the signal at a predetermined

24、amplitude. The output of the limiter is applied to a modified Foster-Seeley discriminator stage, and the audio information extracted from the fm signal. f.The audio signal from the discriminator is increased by the audio amplifier and applied either to the horn transducer or headset depending upon w

25、hich is used. The squelch circuit, when applied, is activated by the presence of 150 Hz tone signal recovered by the discriminator from the incoming signal and disables the audio amplifier to keep the receiver quiet in the absence of a signal. 1-5. Antenna and rf Circuits (fig. 4-10) a.The AN/PRR-9(

26、XE-9) receiver antenna E1 (Antenna AS-1998/PRR-9) is a whip-type antenna most receptive to any direction of horizontal radiation. A permeability tuned loading coil L1 is used to electrically compensate for the physical shortness of the antenna. The signal from the antenna is coupled through loading

27、coil L1 to a double-tuned circuit by means of a low- impedance tap of transformer T1. The input tuned circuit consists of variable capacitor C1 and the inductance of TI. The rf signal is coupled by capacitor C2 to the other half of the double-tuned circuit, consisting of variable capacitor C3 and th

28、e primary winding of transformer T2. The signal is inductive- coupled to T2 secondary and to Z11 the input of the rf amplifier. The output of the rf amplifier is coupled from Zi-4 to a tap on the primary of transformer T3. The primary of T3 and variable capacitor C7 form the third tuned circuit at t

29、he rf signal frequency. b.The primary to secondary turns ratio of T2 and the tap on the primary of T3 provide the proper impedance relationships to maintain stability of the rf amplifier under all voltage and temperature service conditions and, at the same time, provide adequate signal gain. c.Capac

30、itors C4 and C5 provide signal bypassing of the T2 secondary. d.Rf choke L2, in conjunction with the capacitors C6 and C9, form a B+ decoupling network providing isolation between the rf amplifier and the first mixer. 1-6. Local Oscillator The transistor for the local oscillator is contained in inte

31、grated circuit Z1. A third overtone (CR-81/U) crystal (Y1) operating in the series-resonant mode de -mines the frequency of oscillation 10.7 MHz below the incoming rf signal. The oscillator output tuned circuit consists of a piston trimmer, C15, and a fixed shielded inductor, L4. The capacitor divid

32、er, C13 and C14, provides the feedback between the transistor collector at Z1-8 and emitter at Z1-10 to sustain oscillation. The injection signal is derived from the oscillator output circuit and is applied to the first mixer circuit at Z1-6 by capacitor C10. Capacitor C12 is the signal bypass for t

33、he oscillator output circuit. Rf choke, L3, in conjunction with capacitors C9 and C12, form a B+ decoupling network providing isolation between the local oscillator and the first mixer. 1-7. First Mixer The transistor for the first mixer is contained in the integrated circuit Z1. The rf signal from

34、the rf amplifier is applied through Z1-6 to the input of the first mixer by means of the secondary winding of T3 and R1. The signal from the local oscillator is applied across the combined impedance of R1 and the secondary of TS. The output of the first mixer at Z1-12 is developed across the tuned c

35、ircuit consisting of T4 and C16, which is resonant at the first i.f. frequency 10.7 MHz. The 10.7 MHz i.f. signal is coupled from the first mixer at a reduced impedance level by means of the tap on T4 and through capacitor C17 to the input of the 10.7 MHz i.f. amplifier at Z2-3. Capacitors C8, C9 an

36、d C11 provide signal bypassing. Rf choke L5, C9 and C22 form a B+ line isolation network between the first mixer and the 10.7 MHz i.f. amplifier. 1-8. I.f. Amplifier, 10.7 MHz The transistor for the 10.7 MHz i.f. amplifier is contained in the i.f. integrated circuit Z2. The i.f. signal is coupled to

37、 the Z2-3 input of the 10.7 MHz i.f. amplifier by C17. The output signal at 1-2 TM 11-5820-549-50-1 Z2- 4 is developed across a capacitively coupled double-tuned circuit consisting of C18, T5, C19, C20 and T6. The signal is then transferred at a reduced impedance from the tap on T6 by means of C21 to the input of the second mixer at Z25. Capacitor C22 functions as the signal bypass for the amplifier. 1-9. Second Oscillator The transistor for the second oscillator is contained in the .i.f. integrated circuit Z2. The second oscillator operating at 10.245 MHz is a Pierce type with the crystal