SCR-578A_B_serv_user_AN08-10-94_1943.pdf

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1、RESTRICTED AN 08-10-94 FOR OFFICIAL USE ONLY ,UE: IHe HANDBOOK OF MAINTENANCE INSTR UCTIONS for RADIO SET SCR-578-A or SCR-578-B This handbook replaces Preliminary Instructions for Radio Set SCR-578-A and Instruction Book for Operation and Maintenance of Radio Set SCR- 578-A (Technical Order No. 08-

2、10-94), dated 27 November 1942 NOTICE: This document contains information affecting the national defense of the United States within the meaning of the Espionage Act, 50 U.S.C., 31 and 32, as amended. Its transmission or the revelation of its contents in any manner to an unauthorized person is prohi

3、bited by law. (AR 380-5) (ARTS 7514 - rI2;- 3 . W-14B, spare Bag BG-I09-A (acces- 39% x 7 dia. smy) (in SCR-57B-A only) Bag BG-II0-A (in SCR- 12% x 10% x 9 57B-A only) Weight (in lbs.) 0.55 2.95 1.5 1 Bag BG-155-A (in SCR- 20y.! x 17 x 14% 7.0 57B-B only) I 2 Balloon M - 27B - A (in5Ysx4y.!dia. cont

4、ainer) Hand Crank GC-18-A *2 Generator M - 315 - A orl1% x 4y.! dia. Generator M-315-B (Hydrogen) *2 Generator M-315-C (Hydrogen) 11% x 4y.! dia. 2 Inflating Tube (Part of 19 x 1 y.! dia. hydrogen genera tor) Handbook of Instruc- B% x 10% tions 1 Kite M-277-A (in SCR- 36% x 3Ys dia. 57B-A only) or K

5、ite M-357-A Parachute M-276-A (in SCR-57B-A only) 1 Parachute M-390-A (in SCR-57B-B only) 18 x 4 1.2 each 0.45 2.75 each 4.75 each 0.5 0.5 1.45 1.5 1.0 2.Bl *1 Radio Transmitter BC- 13 x 10 x 9 15.B 77B-E *1 Signal Lamp M-30B-A 3Ys x 3 dia. 0.3 (in container) *1 Signal Lamp M-30B-B 2Ys x 3 dia. 0.2

6、(in container) Total Weight-34 lbs. (for SCR-57B-A with 2 cans of Generator M-315-A or M-315-B) RESTRICTED Section I Paragraphs 2-3 RESTRICTED AN 08-10-94 38 lbs. (for SCR-S78-B with 2 cans of Generator M-31S-A or M-31S-B) 38 lbs. (for SCR-S78-A with 2 cans of Generator M-315-C) 42 lbs. (for SCR-S78

7、-B with 2 cans of Generator M-31S-C) * A max imum of two hydrogen generators may be supplied with a given radio set. In some cases due to shortage of supplies only one generator is furnished. * Radio Set SCR-S78-A or SCR-S78-B may contain any one of the following: Radio Transmitter BC-778-A, BC-778-

8、B, BC-778-C, BC-778-D, BC-778-E, or BC-778-F. * Only one signal lamp is supplied with a. given radio set. 3. DESCRIPTION OF COMPONENTS. a. RADIO TRANSMITTER - The transmitter 1 self-contained in a cast shell and is air tight and water proof. (See fig. 2.) The shell is molded to the contour of the op

9、erators legs, between which it is held for operation. The operating controls, antenna TUNE, RADIO-LIGHT selector switch, and the manual KEY Figure 2-Radio Transmitter BC-778-E, Front View are grouped in the elongated oval depression on the front panel. Reel RL-48, holdit.g 300 feet of Antenna Wire W

10、-147 or W-148 (see fig. 14) is in a compart ment also mounted on the front panel. A strap is provided for securing the transmitter between the legs of the operator (see figs. 13 and 20). Various models of the radio transmitter differ only in details of elec trical or mechanical design. The differenc

11、es are sum marized as follows: (1) Radio Transmitter BC-778-A is the original transmitter supplied with Radio Set SCR-578-A. (2) Radio Transmitter BC-778-B is an electrically modified version of Radio Transmitter BC-778-A. It uses a transformer-coupled audio oscillator instead of the resistance-coup

12、led oscillator used in Radio Trans- mitter BC-778-A. A neutralizing winding has been added to the r-f oscillator plate coil, and the plate is shunt-fed. (3) Radio Transmitter BC-778-C is a modified version of Radio Transmitter BC-778-B and differs only in that no automatic keying of the signal lamp

13、is provided. In AUTO I-LIGHT and AUTO 2- LIGHT selector switch positions, the signal lamp is continuously illuminated. (4) Radio Transmitter BC-778-D is a mechanically improved model of Radio Transmitter BC-778-C. The improvements are a new type of lock-open antenna reel door, a new type of antenna-

14、reel brake, improved instruction name plates, and longer-life gears in the main-power and govrnor gear trains. (5) Radio Transmitter BC-778-E is the same as Radio Transmitter BC-778-D with the exception of a new type of antenna lead-in fastening. (6) Radio Transmitter BC-778-F is a modified version

15、of Radio Transmitter BC-778-C. The modifi- Figure 3-Kite M-277-A, Assembled and with Antenna Attached 2 RESTRICTED RESTRICTED AN 08-1 0-94 Section 1 Paragraph 3 cation consists of the replacement of the main-power and governor gear trains with longer-life gears. The name-plate type number is then ch

16、anged to BC- 778-F. Radio Transmitters BC-778-A aftd BC-77S-B may also be similarly modified. All such sets retain the original name plate, but are marked, THIS EQUIPMENT HAS BEEN MODIFIED TO CON FORM WITH A BC-77S-F. h. KITE M-357-A or M-277-A (see figs. 3 and 4) Either kite is used to send aloft t

17、he antenna. (1) Kite M-277-A is the original kite supplied with Radio Set SCR-57S-A. It is a collapsible box kite measuring 17 x 17 x 36 inches assembled. Com plete instructions for its assembly and use are given on the cylindrical container in which the kite is packed. This kite will fly in wind ve

18、locities of from 7 to 40 mph. The cloth on the kite has been treated, making it moisture-repellent, and a section filled with kapok gives buoyancy. Continued soaking, however, will eventually cause it to become saturated. (2) Kite M-357-A is identical with Kite M-277-A, except that the 36-inch longe

19、rons have been divided in the middle and equipped with sleeve fittings; this permits the complete kite to be stowed in a space ap proximately 2 x 4 x 19 inches. Complete instructions for the use of Kite M-357-A are given on the con tainer in which it is packed. Figure 4-Signal Lamp M-308-A with Hand

20、 Cronic GC-J8-A Figure 5-Signal Lamp M-308-8 c. SIGNAL LAMPS. (1) Signal Lamp M-30S-A is the original signal lamp supplied with Radio Set SCR-57S-A. (See fig. 4.) A strap fastens it around the operators head with the light on his forehead. This signal lamp is direc tional. (2) Signal Lamp M-30S-B is

21、 a modification of Signal Lamp M-30S-A. (See fig. 5.) The modification consists of a dome type of lens, making the lamp non directional. This lamp MUST be placed on top of the head with the strap under the operators chin. d. HYDROGEN GENERATORS. - A hydrogen generator (see fig. 6) is used to inflate

22、 the balloon. Upon coming in contact with water, hydrogen is gen erated by a chemical solid within the container. The hydrogen is supplied to the balloon by means of an inflating tube (see fig. 7). (1) Generator M-315-A is the original type and has been supplied with all sets to date (July 1943). It

23、s operating time is about 40 minutes, and it is quite RESTRICTED 3 I Section I Paragraph 3 RESTRICTED AN 08-10-94 sensitive as regards depth of immersion. It is filled with one pound of lithium hydride. (2) Generator M-31S-B is also filled with one pound of lithium hydride, but the generator itself

24、is improved. As a result, the operating time is only one half as long, and the depth of immersion is not so critical. Figure 6-Generator M-315-B or M-315-C (Hydrogen) with Inflating Tube (3) Generator M-31S-C is filled with three pounds of calcium hydride. There is no appreciable difference between

25、it and Generator M-31S-B as far as use and performance are concerned. e. BALLOON M-27B-A.-This balloon is for rais ing the antenna when lack of wind does not permit use of the kite. Inflated, its diameter will be approxi mately 4 feet (see fig. 7). Figure 7 -Balloon M-278-A, Inflated with Antenna At

26、tached f BAGS BG-109-A, BG-llO-A, and BG-lS5-A. The first two together contain Radio Set SCR-S7B-A. They are strapped securely together (see fig. 1). (1) Bag BG-I09-A (see fig. B) contains the follow ing accessories: Quantity Article 1 Kite M-3S7-A or M-277-A 2 Balloon M-27B-A 2 Generator M-31S-A, M

27、-315-B or M-31S-C with inflating tube 1 Signal Lamp M-30B-A or M-30B-B 1 Extra roll of Antenna Wire W -148 or W -147 1 Instruction Book 4 RESTRICTED RESTRICTED AN 08-10-94 (2) Bag BG-llO-A (see fig. 9) contains the radio transmitter with Hand Crank GC-18-A (see fig. 13) affixed. Permanently attached

28、 to this bag is Parachute M-276-A with static cord and snap fastener. Included in the bag is a second copy of this handbook of in structions. (3) Bag BG-155-A contains all of Radio Set SCR- 578-B. Attached to this bag is Parachute M-390-A with static cord and snap fastener (see fig. 12). Section I P

29、aragraph 3 Figure 9-Bag BG-ll0-A with Parachute M-276-A, Packed with Static Line in Place Figure 8-Bag BG-I09-A (Accessory), Packed RESTRICTED Figure 1O-Bags BG-I09-A and BG-ll0-A and Parachute M-276-A, Unpacked 5 Section I RESTRICTED AN 08-10-94 6 Figure 11-8ag 8G-J55-A with Parachute M-390-A, Pack

30、ed with Static Line in Place RESTRICTED Figure J2-8ag 8G-J55-A with Parachute M-390-A, Unpacked RESTRICTED AN 08-10-94 Section Paragraphs 1-3 SECTION II INSTALLATION AND ADJUSTMENT 1. INSTALLATION IN AN AIRPLANE. Locate the radio set in an aircraft to facilitate fast removal in the event of an emerg

31、ency landing. The two bags containing all the equipment for the radio set must be securely strapped together. 2. REMOVAL FROM THE AIRLANE. tl. If the airplane is ditched (crash-landed on water), throw the radio set out of the airplane at the same time that the life raft is removed. Do not worry abou

32、t its getting wet. It will float and remain near until picked up. Make sure, however, that it is recovered before paddling away. h. Only when the airplane is abandoned by para chute shall the radio transmitter be dropPed from the air. Drop it at the same time the life rafts are dropped and complete

33、the abandonment as quickly as possible so that the crew and equipment will land as closely together as possible. c. If the radio set is to be dropped from an airplane (not in distress) to aid survivors who have been sighted, slow the airplane to its slowest flying speed and drop the equipment from a

34、n altitude of from 300 to 500 feet. If the speed is too great, damage or loss of the equipment may result and if the altitude at the time of release is too great, the radio set may drift too far while descending. d. Using the parachute provided, drop the equip ment on land or water. There is a great

35、 risk of dam age to the equipment when dropped upon land. Therefore, wherever it is possible, drop the equipment upon a body of water. e. In dropping the equipment by parachute, ob serve the following steps: (1) Fasten the loose end of the static line to the metal structure of the airplane. WARNING

36、Do not attach the static line to any part of your body when throwing out the radio equipment. (2) Be sure that the static line, which is 12 feet long, is in the clear and does not foul. (3) Throw out the radio equipment. The para chute will be opened by the static line. (4) Complete operating instru

37、ctions are contained in one of the bags which contain the equipment. Complete instructions for the use of the transmitter are also located on the transmitter. 3. ASSEMBLY OF THE EQUIPMENT. CAUTION Do not raise antenna or leave it up during lightning. To do this may result in severe injury to personn

38、el. tl. Remove the radio transmitter from its bag. h. Antenna Reel RL-48 is accessible from the trans mitter front panel by removing the cotter key and opening the antenna-reel compartment door. If you have either Radio Transmitter BC-778-D or Radio Transmitter BC-778-E, keep the door open by slidin

39、g the cotter key into the holes provided at the door hinge in these two models (see fig. 14). Take enough slack wire from the reel to attach to the kite or the balloon. Adjust brake tension on the reel and main tain a slight tension by rotating the BRAKE knob clockwise. NOTICE See that the antenna w

40、ire does not kink while unreeling as a strong tug by the kite might cause the wire to break. c. Unscrew the cap marked GROUND and remove the ground-wire reel. On water, play out the wire into the water, using the cap as a weight to keep it sub merged. Proper operation of the transmitter on land depe

41、nds upon an adequate ground and will be ob tained only on very wet soil, and then only when the ground wire and cap have been buried as deeply as possible into the earth. If a body of water is avail able, operate the equipment, if possible, some distance offshore. RESTRICTED 7 Section II CRANK WELL

42、8 RESTRICTED AN 08-1 0-94 CRANK IN OPERATING POSITION SPEED INDICATOR LIGHT TUNE TO BRIGHTEST / INDICATOR CRANK RETAINING PIN CRANK SHAFT CAP Figure 13-RoJio Transmitter BC-778-E, Rear Oblique View RESTRICTED - JACK FOR SIGNAL LAMP M-308-B TUNE TO 300 FT. ANTENNA ANTENNA CONTROL ANTENNA LEAD-IN REST

43、RICTED AN 08-10-94 Section II RADIO - LIGHT SWITCH ANTENNA BRAKE ANTENNA REEL RL -48 Figure 14-Radio Transmitter SC-778-E, Front Oblique View RESTRICTED 9 Section II Paragraph 3 RESTRICTED AN 08-10-94 NOTE It is absolutely essential to maintain an ade quate ground when transmitting. PROBABLE RANGE O

44、F RADIO SET Location Distance in Miles At sea . . . . . . . . . . . . . . . . . . . . . . 250 to 500 In boat (center of inland lake) . . 50 to 150 At edge of lake 0( large stream (ground lead in water) * . . . . . . , 30 to 50 On land (ground lead buried in moist earth)* . . . . . . . . . . . . . .

45、. 5 to 10 * The TUNE TO BRIGHTEST indicator may not function under these condi tions. Use all the antenna wire and tune to the mark on the dial. d. Set the transmitter in the bottom of the boat or life raft (if on water) ready to be secured to the oper ator later by means of straps provided at the s

46、ides of the unit. e. Kite M-357-A or Kite M-227-A is individually packed in a long cylindrical package in accessory Bag BG-109-A of the radio set. Remove the kite and lay it crosswise on the lap. Holding the kite securely with Figure J5-Kite M-277-A or NI-357-A, First Expansion Operation one hand, r

47、each the other hand in through its center. Push outward on the hinged spider to make the four upright longerons spread. When these have been suffi- Figure J6-Kite M-277-A or M-357-A, Second Expansion Operation ciently extended, they will lock into position. Repeat procedure for opening opposite end

48、of kite. Stop pushing on the spiders just as soon as you feel them jump. The process may be thou3ht of as similar to that of opening an umbrella (see figs. 15 and 16). f. If you have Kite M-357-A (part of Radio Set SCR-578-B) which is divided in two, assemble by fitting the ends of the four longerons on one half into their respective sockets on the other half (see fig. 17) before proceeding with the instructions above. Be sure that the halves are pressed tightly together so that the locking mechanism holds them firmly in position