AN-ARR-15A_serv_user_AN16-30ARR15-3_1947.pdf

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1、 Sacfion I Porogrophs 6-ll AN l630ARRl5-3 6. AUDIO OUTPUT CHARACIERISTICS. ditions are the limiting factors. The required per- The r.rdio output is consistent at 500 milliwatts maxirnum with avc and noise limiter action. With r-f inputs of 10 to 10,000 microvolts, 30 per cent modulated, the output w

2、ill contain 157o or less dis- tortion. The audio response does not vary more than plus or. minus three db relative to the response at 1000 cps for modulation frequencies of 300 to 3500 cps. The maximum attenuation is attained below 300 cps and above 3500 cps. The low pass filter provided for cw rece

3、ption is down 30 db or more at 1600 cps from 1200 cps reference frequency and within three db from 1200 cps to 300 cps. 7. WPES OF RECEPTION. Voice, cw or mcw signale may be received w.ith this equipment. A control on the front panel of the receiver perrnits the selection of the tlpe of re- ception.

4、 This control is designated CW-MCW-CAL and should be operated to the MCW-CAL position when it is desired to receive voice or mcw signels. When voice modulated or mcw reception is selected, the beat frequency oscillator circuit is disabled, the avc circuit is connected so as to be operative and a var

5、iable T pad is used to control the input. to the headphones. If cw reception is selected, the avc is partially disabled, the T pad is disconnected fiom the audio outtrlut circuit, and a potentiometer con- nected in the cathode circuit of the r-f amplifier and first and second i-f amplifier tube circ

6、uits, is used to control the gain. Both T pad and potentiometer are operated by the volume control. 8. SUCCESSFUT OPERATING IIMITS. a. TEMPERATIRE. This equipment is designed to operate at tem- peratures withiu range of -40C to 60C (-40F to +140F). At temperatures below -30C (-22T), a 20 minute warr

7、n-up period in still air should be allowed before making any adjustments or operating the channel selecting mechanism. b. ALTTruDE. This equipment will operate satisfactorily up to an altitude of 40,000 feet above sea level. c. DISTANCE. The distance limits of this receiving equipment will be determ

8、ined by the conditions existing at the time of operating (day or night). The interference, time of operating, frequency and many other con- t-2 formanee will be obtained under normal conditions encountered in aircraft radio operation. 9. POWER SOURCE REQUIREMENTS. This equipment has been designed to

9、 operate from a 26.5 volt d-c supply. A variation of the voltage of plus or minus 70% wil not materially affect the operation of the equipment. The current drain does not exceed three and one-tenth amperes during warm-up and reception or eight and one-half ampres during operation of the channel sele

10、cting mechani.sm. Dynamotor starting surge is not in- cluded in the above figures. Dynamotor starting surge is approximately 15 amperes. IO. TYPE OF CONTROI. The tuning controls located on the front panel operate all preselection and conversion oscillator circuits of the receiver. Appropriate dials,

11、 calibrated in frequency, ar associated with these controls to indicate the frequency to which the receiver is tuned. The controls may be operated either manually or electrically. This equipment employs the AIIIO- TUNE system of channel selgction. Ten frequency channels may be manually selected and

12、the controls lockeC. The controls may then be repositioned elec- trically to any one of the ten channels by operating the channel selectiag switch on the front panel of the equipment. Note The last operator that rotates his power ON- OFF switch to the ON position will have control of the eouinment.

13、II. ANTENNA. This equipment has been designed to operate with a fixed aircraft antenna ranging from 17 feet to 40 feet in length, which is also used for transmission. The transmitter used with this receiver should have a suitable change over relay, which will ground the receivet antenna connection d

14、uring transmission. A spring type binding post, located near the upper edge of the front panel, provides the antenna con- nection for the equipment. A spring type binding post, located near the lower edge of the front panel, provides the ground con- nection for the equipment. 1 I Revised 15 October

15、1947 AN r6-30ARR|5-3 Se:tion I Porogroph 12.o. Figure l-2. Receiyer Unit R-l05/ARR-15 I2 MECHANICAL AND ELECTRICAT CHARACTERISTICS. o. MECHANICAL DESCRIPTION. (1) RADrO RECETVER R_105/ARR_15. Dy_ NAMOTOR DY-34/ARR-15 and MOUNTING BASE MT-461,/ARR-15. The receiver and dynamotor power supply are conta

16、ined in a single cabinet. The receiver cabinet has been designed to mount on a detachable shock reducing base. The base is designed to be installed as an integral part of the aircraft. The two main sections of the mounting base are held apart by live rubber cushions. It is onlv necessarv to have acc

17、ess to the front of the equipment in order to fasten the unit to or remove tire unit from the mounting base. The equipment may be fastened to or loosened from the mounting base by tightening or loosening two wing nuts on the front of the equipment. A multiterminal receptacle is mounted on the rear o

18、f the receiver chassis. When the equip- ment is fastened to the mounting base the plug on the mounting base makes all of the electrical con- nections to the equipment except the antenna con- nections. In addition to the shock reducing base on the receiver, a spring and rubber cushioned base is attac

19、hed to the dynamotor to prevent the vibra- tion that is caused by operation of the dynamoror, affecting the operation of the receiver. The instal- Iation section of this handbook gives the procedure to be followed for the mounting of the baie and re- ceiver. No external equipment except an antenna,

20、a set of headphones aad a 26.5 volt d-c power source are necessary to complete the installation for panel control. If it is desired to control the receiver from a position some distance from the installation, addi- tional controls are necessary. These controls are duplicates of the controls that are

21、 mounted on the r.eceiver panel. Any number of remote control positions may be used with this equipment by con- Revised l5 October 1947 Figure l-3. Mounting BaseMf -461/ARR-I 5 necting the controls at the remote position in paral- lel with those mounted on the receiver panel. Remote control of the r

22、eceiver is entirely electrical and no mechanical linkages are necessary for the installation. This receiver is equipped with the AUTO- TUNE method of frequency selection. The AUTO- TUNE system is an electrically controlled means of mechanically repositioning adjustable elements such as tap switches,

23、 variable capacitors and variable inductors to predetermined settings. Any combi- nation of these items may be tuned to any one of several frequency chanels by use of this system. In this particular equipment ten frequency channels are available. Any one of these ten frequency channels may be select

24、ed by operating a switch on the receiver panel. The AUTOTUNE system will operate to select the frequency channel in a period that will not exceed seven seconds at room tempera- ture and with a normal suppiy voltage (26.5 v). Lower temperature or lower source voltage or a combination of both will res

25、ult in an increase in the time necessary to shift frequency channels. The accuracy of repositioning is of a very high order and is not seriously afiected by wear, humidity or temperature changes. No tools are necessary for the adjustment of the AUTOTUNE mechanism. Refer to page 2-10 Section II, Para

26、graph 2. c. Ad- justments, for the procedure to be followed when changing a frequency channel. Every effort has been made in the design of this equipment to reduce to a minimum the tirne that is required for the repair or replacement of components within the receiver. All components are accessible e

27、ither from the sides or bottom u.hen the receiver is removed from the cabinet. The l-3 Sectisn I Porogrophs 12.a.-12.b.AN l6-30ARRr5-3 components in assemblies that could not be mounted on accessible portions of the receiver chassis have been built into sub units that plug into receptacles mounted o

28、n the main receiver chassis. The four units that may be removed from the main assembly are the cfi unit, relay unit line fllter unit and the dynamotor unit. With the receiver cabinet removed, the fasteners on the dynamotor are accessible from b. ELECTRICAL DESCRIINON. The receiver employs a superhet

29、erodyne cir- cuit and will receive cw and amplitude modulated voice and mcw signals. All of the tube heaters and a dynamotor operate from the 26.5 volts d-c power source. The dynamotor furnishes high voltage lor the receiving tubes. (1) RF AND IF AMPLTFTER CIRCUITS. The superheterodyne circuit emplo

30、ys one stage of r-f amplification and two stages of i-f ampli- fication. The i-f transformers are variable and will tune to frequencies in the range 450 to 550 kc. The variable characteristic of these transformers is used only during the calibrating of the receiver. When the receiver has been calibr

31、ated and it is desired to receive a transrnitted signal, the if transformers arg adjusted so that the intermediate frequency, as used for reception, is 500 kc. For cali- bration and excitation purposes three oscillators have been incorporated in this receiver. The fre- quency of one oscillator circu

32、it is determined by a 100 kc quartz crystal. Harmonics of this 100 kc signal are used when calibrating the receiver. Dur- ing actual reception this oscillator is disabled by t-4 the top of the receiver. All connections except the connection to the antenna are made to a multiter- minal connector plug

33、 receptacle mounted on the rear of the mounting rack. Ground connections are rnade through the connector plug. The connector plug on the receiver is inserted into the plug re- ceptacle when tlle receiver is secured in place on the mounting rack. removing the plate and screen voltages from the oscill

34、ator tube. The frequency converting stage of this re- ceiver is separately excited. One of the variable frequency oscillators is used to excite the rnixer tube. This oscillator operates in the frequency range 2000 to 3000 kc and a frequency multiplier circuit is used to obtain the higher frequency e

35、x- citation voltages. The remaining oscillator tube is essentially a beat frequency oscillator, but is also used during the caiibration of the receiver. The output of this oscillator is in the frequency range 450 to 550 kc. When voice modulated or mcw signals are being received, the beat frequency o

36、s- cillator circuit. is disabled by removing the plate and screen voltage from the oscillator tube. Both of the variable frequency oscillators are preclsion built, mechanically and electrically, and their output is very stable under extreme conditions of humidity and temperature change. (2) DETECTOR

37、, AVC, NOISE LIMITER AND AUDIO AMPLIFIER CIRCUITS. In the R-105/ARR-15 Receiver. the detector circuit employs a fixed crystal detector unit. Two EXC I TER IST IF AIJPL IF IER 2XD IF AMPLIFIER O ETECTOR x0tsE LIMITER AUOIO DR I YER OU TPUT AUOIO AI,PLIFIER Figure l-4. Receiver Block Diagram Revised I

38、 Februory 1949 AN I6.3OARRI5.3 Section I Porogrophs 12.b.-13 tubes, a dual diode and a dual triode, are necessary for the noise limiter. The dual triode is a balancer tube while the dual diode functions as the noise limiter tube. In the R-105A/ARR-15 Receiver, the detector circuit employs one-haU of

39、 a dual triode (diode connected). A dual diode and a section from each of two difterent dual triodes are used for the noise limiter. The two triodes are balancer tubes while the dual diode functions as the noise limiter tube. A dual triode is used to supply avc voltage, one section of the dual triod

40、e is used in a trigger circuit while the other section is used to supply the avc voltage. Two stages of audio amplification pro- vide ample output for the operation of headphones. (3) POWER SUPPLY CrRCUrlfS. The tube filaments are connected in series parallel across the power source. The relay coils

41、 are energized by the power source. A plug-in dyna- motor unit furnishes the high voltage to the tubes. The motor section of the d5mamotor operates from the 26.5 volt d-c power source. (4) REMOTE CONTROL CTRCUITS. This equipment has facilities for connection of a remote control unit for remote power

42、 control and remote selection of receiving channels. The remote circuits should be similar to the circuits within the receiver. Any number of remote control units may be used since only one remote controi can have control of te equipment at one time, pro- vided the remote power switch is identical t

43、o the power switch in the receiver. The power switch (ON-OFF) in the receiver is a special switch which can be turned off manually or by an electrical im- pulse. The electrical impulse is furnished by the remote control desiring control over the equipment. I3. PURPOSE OF TROPTCATIZATION TREATMENT. T

44、his radio set has been tropicalized as outlined in Specification JAN-T-152. The purpose of the tropicalization treahnent given the equipment is to protect the equipment when subjected to moisture and fungrrs conditions nor- mally encountered. This treatment is intended to accomplish the following: o

45、. To render the surfaces moisture-resistant. b. To envelop terrninals and connections with a low moisture absorbing filrn and thereby minimize surface electrical leakage and arc-over. c. To retard tre absorption of moisture. d. To aid in retarding corosion. e. To prevent the grorth of fungi. Revised

46、 l February 1949 l-5 Section ll AN l6-30ARRI5-3 Radio Receiver R-105/ARR-15 !. Headset H-1IAR or Equal f 2-O Figure 2-1 . Rodio Sef AN/ARR-I s-lnstallation Seciion tt Porogroph l.o. AN t6-30ARRt5-3 sEcTloN ll INSTALLATION AND ADJUSTMENT I. INSTALTATION. o. PRELIMINARY. (1) UNPACKiNG. (See fisure J-l

47、)-All the equipment for lhe Radio Set AN/ARR-15 which is supplied by the contractor is in one crate. This equipment consists of a receiver unit, a receiver mounting base, and a power connector to be at- tached to the mounting base. lf the crate is marked with arrows to indieate the upright position,

48、 re- move the crate cover only. Remove the packing material and lift the units out carefully. Search ail the packing material for small packages. Inspect each unit for loose screws and bolts. Be certain that all controls such as switches, dials, etc., work properly. AIl claims for damage should be f

49、iled promptly with the transportation company. If a claim for damage is to be filed, the original packing case and packing material must be preserved. Check the equipment received against the table EQUIP- MENT SUPPLIED (Section 1, paragraph 2, page 1-1). (2) CTTECKTNG VACUUM TUBES AND PLUG-IN UNITS.-Loosen the receiver unit from the cabinet by disengaging the Dzus fastener that protrudes through the rear of the cabinet. Remove the receiver unit from the cabiaet by pulling it forward. With the unit removed from the cabinet check all of the vacuurn tubes to be certa