SCR-536A_C_serv_user_TM11-235_1943.pdf

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1、 , RESTRICTED TM 11-235 WAR DEPARTMENT TECHNICAL MANUAL RADIO SETS SCR-536-A, SCR-536-B,I I . A SCR-536-C May 14, 1943 *TM 11-235 RESTRICTED lECHNICAL MANUAL No. 11-235 WAR DEPARTMENT, WASHINGTON, May 14, 1943. RADIO SETS SCR-536:A, SCR-536-B, AND SCR-536-C DESTRUCTION NOTICE Depending upon.the time

2、 and materials available, when the capture of this equipment by the enemy is certain, completely destroy it by one or more of the following means: 1. Explosives such as grenades or TNT. 2. Incendiaries such as wood, oil, and gasoline. 3. Axes, hammers, large rocks, or other hard, heavy objects such

3、as hand generators, dynamotors, etc. Removal of the chassis from the case will simplify the above means of destruction. When this is done be sure to smash crystals and holders, tubes, coils, microphone, earphone, and batteries. Destroy all instruction books, Technical Manuals, circuit diagrams, or o

4、ther literature for this radio set at the same time. SAFETY NOTICE The voltages used in this radio set are not high enough to be injurious. A slight shock, of negligible magnitude,. may result by touching the antenna and case at the same time, when the set is transmitting. Paragraphs SECTION I. Desc

5、ription _ _ 1-9 II. EmploymenL _ _ 10-23 III. Functioning of parts _ _ _ 24-38 IV. Maintenance _ . _ 39-78 V. Supplementary data _ 79-80 Page INDEx _ _ _ 82 *This manual supersedes TM 11-235, March, 1942. 1 I I I 1 SIGNAL CORPS SECTION J DESCRIPTION Paragraph lJse_ _ 1 Components, weights, and rlinl

6、fm;ions_ 2 Total weights _ -_ 3 Source of power and power requirernents _ _ 4 Iistance range _ - Frequency coverage _ . _ ._ 6 Modes of tram:mi!ision and rpception_ 7 Lntrols _ 8 )escription of cornponents_ 9 1. Use. Radio set SGR-536-(*) is designed for short-range two way voice conversation. Descr

7、iptively, it is a press-to-talk portable radio telephone, receiving and transmitting on the same frequency. No skill is required to operate it. . a. The set is self-contained; all equipment necessary for reception and transmission is contained in one aluminum case. b. The set may be held in either h

8、and when operating, although it is designed and balanced for left-hand operation. The microphone and earphone are attached to the case in such manner that the set resembles a hand telephone. An adjustable carrying strap is attached to the case. (See figs. 1 and 2.) Radio sets SCR-G36-A, SCR-536-B, a

9、nd SCR-536-C are alike, for all practical purposes. The different suffix letters indicate different procurements. For con venience, they are referred to throughout this manual as radio set SCR-536(*) except where some difference exists between types. Similarly thl component parts, radio recei.vers a

10、nd transmitterS BC-611-A, BC-611-B, and BC-611-C are referred to as radio receiver and transmitter B611-(). Test equipments IE-17-A, IE-17-B, and IE-17-C are referred to as IE-17-(). 2 RADIO SETS SCR 53 6-A, -B, AND -j 2-4 2. COlVl PONKNTS, WEIGHTS, AND DIM FrNSIONS. Quan tity Article Dimensions (in

11、ches) _ Unit -,- - -.- -.- -;-weight Heigllt Widtll Depth Length Diam-(pounds) eter -I-I-I-I- L L 2 1 1 1 1 Battery BA-37 (1.5 volts) _ _ Battery BA-38 (103.5 volts) _ Preliminary instructions _ _ Radio receiver and transmit- ter BC-611-(*) (with coils, crystals and tubes, but without batteries). Se

12、t of crystals (spare).2 Tube set GK-174 (spare): 61 11% 11 15% -_ _ _ _ L%6 0. 55 P72 FYs2 _ _ _ 1. 10 8% _ _ _ _ _ _ _ _ _ _ . 3% 5% _ _ _ _ _ _ _ _ _ _ _ _ 3. 85 Consisting of; . 1 tube VT-17L _ _ _ _ _ _ _ _ _ _ _ _ 1 tube VT-172 _ _ _ _ _ _ _ 1 tube VT-173 _ _ _ _ _ _ _ _ _ _ _ 2 tube VT-174 _ _

13、 _ _ _ _ _ _ _ _ _ _ Box BX-49 Containing;3 12 sets of crystals (trans- mitting and receiving) 12 sets of antenna coils. 12 sets of r-f tank coils. (1 set of coils and crystal for each of 12 operat ing frequencies) . 01 01 01 . 01 I DimenSiOns, wbere unappreciable, are omitted. , (omloncnt of SCR-53

14、6-A only. -Component of SCR-53:RY BA-38- , .,. - . -.-., I PRESS.,. TO-TALK SWITCH .PlUG MI(:ION Il!G A . - _ BATTERY CONTACT SOARD ., ?- - - BATTERY BA37 7L55J) FIG eRE 1. Radio set :;CR-;:(j-(*) showing battery compartment. 5. Distance range. The set is designed to operate over distances from IOU

15、feet to 1 mile. The dependauility of operation at the greater distance will depend on the terrain and the freedom from signal absolbil1g objects such as steel buildings, trees, hills, and tele phone and power lines between the two sets. This is particularly true for sets operating at the higher freq

16、uencies in the band. The maximum range may be considerably greater when operating over water or in the air. 6. Frequency coverage. Radio set SCR-536-(*) is crystal con trolled on both reception and transmi:;sion, and will operate over the frequency range of 3500 to 6000 kilocycles. However, each uni

17、t is adjusted to operate at only one frequency in this band. The set can be made to operate at any frequency in the band by proper choice of crystals and coils. For correct performance, each set must be adjusted to the crystals used. The coils and crystal changes and their adjustments cannot be made

18、 by the operator, but are preset by the manufacturer or by maintenance men at authorized repair points. (See sec. IV.) 4 , RADIO SETS SGB 536-A, -B, AND -C 7-9 7. Modes of transmission and reception. Radio set SCR- 5:W-(*) transmits and receives amplitude modulated voice signals only. S. Controls. a

19、. Send-receive. A press-to-talk switch, conven iently located under the finger tips when the radio set is held in nOl11ml operating position, is the only control required for operation of this equipment. (See fig. 1.) b. On-off. By fully extending the telescopic antenna rod, the set is automatically

20、 turned on, Vhen the telescopic antenna rod is fully retracted the set is automatically turned off. (The bottom section of the antenna operates the on-off power switch.) c. Volume. No volume cont.rol is used with this set. The volume in the earphone is set to a normal level by the design of the equi

21、pment. . d. TIl.ning. The operator is not required to make tuning ad justments of any kind. (See par. 6.) 9. Description of components. a. The housing which incloses radio receiver and transmitter B0-611-(*) is an aluminum casting. Its interior is divided into three compartments, one for the radio e

22、hassis, one for the A battery BA-37, and one for th_ B battery RA-38. Two projections from the housing contain the earphone and microphone units, These projections are so spaced and of such length that when the unit is held with the earphone against the Pour or the operator, the microphone or mouthp

23、iece is in the proper position for talking. b. The press-to-talk switch, mounted on the side of the case, operates the change-over switch on the radio chassis. This converts the set from a receiver to a transmitter. This switch is so locatd that it may be operated easily with the fingertips when the

24、 set is held in the left hand. c. The bottom cover hinges to the housing and is provided with a , slot into which a latching bolt fits. It is through this end of the housing that the chassis and batteries are inserted or removed. A contact terminal board inside the bottom cover provides the con nect

25、ions between tIll: batteries and the radio chassis. d. A small card holder below the press-to-talk switch contains a plastic card on which the operating frequency and date of bat tery replacement are marked. This card is protected from weal by a tra.nsparent cover. To remove the card from its contai

26、ner the bottom cover must be opened. (See fig. 1.) e. The top cover of the set contains an opening for the antenna rod. This cover is held in place by a mounting screw which holds 5 I I , 9-11 SIGNAL CORPS the chassis securely in the housing. Spring battery contacts and a spacer for the A battery BA

27、.-37, fastened to the top OVCl, make electrical connections to the batteries. f. A.n antenna cap, attached to the top cover on the outside by a chain, protects the telescopic rod antenna against weather conditions when the set is not in use. NOTE. Early issues of radio set SCR-536-A were furnished w

28、ith a crystal microphone and crYRtal earplJOne. All later issues of SCR-536-A and radio sets SCR-536-R and SCR-536-C are furnished with an inductor microphone and an inductor earphone. These components are electrically and mechanically inter changeable with the crystal Ilnits they repIacf . SECTION

29、Il EMPLOYMENT Paragraph Initial procedure _ . 10 Installation _ ._ 11 Preparation for use _ .: _ :._ 12 Starting the seL_ 13 Receiving_ 14 Transmitting_ 15 Turning off set_ 16 Opera tioD over long periods_ _ _ 17 NettiDg_ 18 Change of frequeucy_ 19 Power outpnt_ 20 Replacing batteries _ ._ 21 Operat

30、ion in the raiu_ 22 Poor reception and transmission_ 23 10. Initial procedure. Unpack the equipment carefully to pre vent. damage or loss of components. Check against list of com ponents in paragraph 2. Also note the channel on which the radio receiver and transmitter are alined. 11. Installation. a

31、. General. The set is furnished by the manu facturer with everything contained in the housing except the bat teries. To put the set into operation, the batteries must be inserted in their proper place. . b. Installation of batteries BA-37 al1d BA-38. Open the radio set bottom cover by turning the la

32、tching bolt knurled nut in a counterclockwise direction, until the nut begins to turn with diffi culty. Then press the cover against the case and push the bolt away from the housing. Release the cover and it will open. (See fig. 1.) (1) Battery BA-37 (filament or A battery) is cylindrical in shape a

33、nd fits into the round compartment of the radio set housing. Insert the battery into the housing with its positive end out. The 6 t;. -_ _ _ RADIO SETS SCR 536-A, -B, AND -C 11-13 Jlositive terminal is marked with a large positive ( + ) sign. It can he idtlltifieJ also by a small raised metal buttol

34、l. The raised buttull permits positive identification when installing battery in darkness. (2) Battery BA-38 (B battery) is oblong in shape and fits into the oblong compartment of the radio set housing. It also must be placed into the battery compartment with the positive (+) end out. The positive t

35、erminal is marked with a large plus ( + ) sign and also can he identified by the small raised metal button. NlJo:,-Uefore closing t.he raflio set bottom cover. mark tile date of battery installation on the dabl card located in tbe pocket just below the press-to-talk witch, Ihe card is remoVld by sli

36、ding it out of the bottom of the pocket, The transparent protective cover will come out with the card, Erase the old date that is marked on the card. and put on the new one, When replacing the card. lcnwmlifr to put the transpalent protective cover OVir the canl. (3) After the batteries are installe

37、d close the bottom covCr of the raJio set by pressing the cover against the housing with one hand, while the other hand moves the latching bolt into the cover slot and tightens the knurled nut by turning it clockwise. The cover then :-;hould be pressed against a solid object and the knurled nut tigh

38、tened by hand until it turns with great difficulty. This will assure positive contact between batteries and battery contacts. 12. Preparation for use. Before radio receiver and transmit tel BCr-fill-(*) can be placed in operation, the following must be done: fl. Unscrew the antenna cap which covers

39、the telescopic a,ntenna. (See fig. 1.) To prevent losing it, this cap is attached to the hous ing by a small chain. Screw the cap on the threaded metal stud on top of the housing. This will prevent the cap from rattling against the housing when operating the set. See that the chain is not . wrapped

40、around the antenna rod and that there is no chance of it touching the rod. h. Pull the antenna out gently until all four sections of the rod are fully extended. The alltcnna then will be about 39 inches long. c. The unit is now held in the left hand, in the same mal Iller as a telephone handset, and

41、 is leady for use as a radiotelephone set. (See fig. 2.) 13. Starting the set. In succeeding paragraphs radio set SCR- 536-(*) will be referred to as the set. The set is turned on when the antenna is fully extended. This is accomplished by a small lever attached to the antemut rud which operates the

42、 power switch on the radio chassis. A rushing nuise in the earphone will indicate that the receiver is on. Also a click will be heard when the switch tumbler snaps over. 1 f I I I 13-1 5 SIGNAL CORPS Caution. A stop at the lower end of the antenna rod prevents it from being pulled out of the ca8e, b

43、ut the bottom Hcction of the antenna mU8t be fully exte?lded since it operates the power switch on the (n.aBsis BY WHIOH THE SET IS TURNED ON . FIGURE 2. Radio set SCR-5lti-(.) in operating position. 14. Receiving. The set is normally in the receive position so that the operator can hear signals from another set if it is transmitting on the same frequency. The set should be held in the hand as shown in figure 2. The antenna will then extend above the head in an approximately vertical position. This is i