SCR720 Operating Instructions
Contents
1. performance of this equipment is ob tained when the supply voltage is between 24 and 28 volts The aircraft crew chief should be notified if this voltage is not obtained during normal flights or if the supply voltage runs consistently low as stated in Para graph 4 Section II System operation described as follows presupposes that preflight adjustments of all screwdriver potenti ometer controls are such as to give optimum screen indi cations If the pattern is not sharp and the screen indications are not proper after the procedure of Para graph 9 this section has been completely carried out additional adjustments may be necessary Except under emergency conditions these should be attempted only by the radio maintenance crew since this requires special adjusting technique 9 PROCEDURE FOR aa EQUIPMENT IN OPERATION NOTE The procedure indicated in a to inclusive see below place the system in a known non operative condition from which it may be put into operation safely by the outlined in p to 88 inclusive a Check that the TRANSMITTER switch 4 is off by pushing the OFF button See Figure 1 b Check that the ROTATION switch 6 is in the OFF position Check that che POWER switch 2 is off by push ing the OFF button d Turn the TILT LIMITS dial 7 to fe second position from the left e Check that the RCVR GAIN control 10 is in the2. a 11 _ 14 Indicator BC 1151 A ann eret NT TM 11 15 Indicator BC 1132 A eii teca 11 16 Radio Frequency Unit BC 1091 A sse 17 Antenna Equipment 94 2 11 18 Inverter Unit PE 218 A PE218 B or PE 118 A 11 vii viii RESTRICTED 08 10 181 LIST OF ILLUSTRATIONS Figure Page 1 Panel of Control Box 1150 cse 6 2 Panel of Synchronizer 1148 et 6 3 Indicator BC 1151 A Operator s POIA AEE T A 7 4 Indicator BC 1152 A 2 44 8 5 Junction Box JB 98 A RM DE S 12 RESTRICTED RESTRICTED AN 08 10 181 HANDBOOK OF OPERATING INSTRUCTIONS RADIO SET SCR 720 A and RADIO SET SCR 720 B SPECIAL NOTICE Though the only difference between Radio Set SCR 720 A and Radio Set SCR 720 B is in the power supplied the instructions as given in this book apply equally well to radio sets An exception to this however is found that the fuses which are described as being located in the inverter unit of Radio Set SCR 720 A are located in the power equipment unit of Radio Set SCR 720 B Radio Set SCR 720 A used chiefly in American installations has an inverter uvit Inverter Unit 218 218 or Inverter Unit PE 1 xd which oper ates from the 27 5 d c volt supply of the airplane Power Equipment PE 158 a com
3. 20 FOCUS INTENSITY SCALE INTENSITY FOCUS CONTROL CONTROL ILLUMINATION CONTROL CONTROL CONTROL Figure 3 Indicator BC 1151 A Operator s RESTRICTED Socnon Paragraph 9 slowiy clockwise and slightly adjust the RCVR FREQ control 8 to obtain a sharp pattern on the indicator screen 25 af Figure 3 This assumes the aircraft is ina favorable position for echoes The RCVR GAIN control should not be too far clockwise otherwise receiver over loading will occur The RCVR FREQ adjustment should be fairly critical Minor readjustments indicated in v may be necessary for optimum results At this point it may be necessary to slightly adjust the GENTR control of the indicator screen 25 so the transmitted pulse coin cides with the 0 point of the scale x Turn the INTENS control 22 and the FOCUS control 23 of Figure 4 slowly clockwise to obtain a satisfactory pattern on the pilot s indicator screen 26 In addition check that the proper lamp 27 is lit Turn the SCALE ILLUM controls 18 of Figure 3 and 21 of Figure 4 to suitably illuminate the scale markings associated with indicator screens 25 and 26 respectively z Turn the AFC switch 1 13 of Figure 2 to ON aa Turn the RANGE STATUTE MILES switch 14 of Figure 2 to the second position from the extreme left The pattern on indicator screen 25 of Figure 3 will expand due to the smaller ra
4. Figure 1 Synchronizer BC 1148 A Figure 2 Indicator 1151 Operator s Figure 3 and Indicator BC 1152 Pilot s Figure 4 RESTRICTED 3 RESTRICTED AN 08 10 181 Section Paragraphs 3 7 SECTION II INSTALLATION AND ADJUSTMENTS 3 GENERAL _ The distribution of the various units of Radio Set SCR 720 A will depend on the type of aircraft Those units with which the operator is most concerned are compactly arranged at his station to facilitate operational efficiency under normal conditions The location of the various other units of Radio Set SCR 720 A will be evi dent to operators who have had specific instructions with this set 4 POWER SUPPLY The electrical energy required for operation of Radio Set SCK 720 A is supplied by the aircraft 24 28 volt d c system An inverter is used to supply alternating current for operation of the equipment The d c voltage of the aircraft system will vaty between 24 and 28 volts de pending on the condition of the ship s batteries and the current output of the ship s regular charging generator If the d c voltage of the airplane system is low the air plane regulator system should be checked and reset by assigned aircraft maintenance personnel The a c output of the inverter unit is regulated to a constant value by circuits contained within Inverter Unit PE 218 A PE 218 or 118 5 INTER UNIT CONNECTIONS _ The necessary connections
5. extreme counterclockwise position See Figure 2 Turn the RANGE STATUTE MILES switch 14 to the extreme right hand position Turn the AFC switch 13 to the OFF A Turn the RADAR BEACON switch 12 to the RADAR position i Turn the RANGE LIGHT INTENS control 11 to its extreme counterclockwise position j Turn the RANGE MARKER INTENS control 15 to its extreme counterclockwise position _ Turn the SCALE ILLUM control 18 to its ex treme counterclockwise position See Figure 3 l Turn the INT ENS control 17 to its extreme counterclockwise position Turn the INTENS control gt to its extreme counterclockwise position Turn the SCALE ILLUM control 21 to its ex treme counterclockwise position See Figure 4 o Turn the INTENS control 22 to its extreme coun terclockwise position p Push the ON button 1 o of the POWER switch See Figure 1 q Check that the maximum crystal current as read on the meter 23 of Figure 1 is between 0 6 milliamperes and 1 5 milliamperes by rotating the RCVR FREQ control 8 of Figure 2 Be sure the entire control range of three complete turns has been covered by this adjustment Leave the control in the position for maximum current r Flip the ANTENNA ROTATION switch 6 of Figure 1 in the ON position The antenna should turn at a relatively low rate of speed s Momentarily turn the INTENS control an of Figure 3 as nearly full cl
6. location to be specified and the Bureau of Ships Such reports of failure shall include 1 Reporting activity 2 Nameplate data 3 Date placed in service 4 Part which failed 5 Nature and cause of failure _ 6 Replacement needed yes no 7 Remedy used or proposed to prevent recurrence FOR BRITISH PERSONNEL Form 1022 procedure shall be used when reporting failure of radio equipment RESTRICTED RESTRICTED AN 08 10 181 DESTRUCTION OF ABANDONED MATERIEL IN THE COMBAT ZONE in case it should become necessary 0 prevent che capture of this equipment and when ordered to so DESTROY IT S THAT PART OF IT CAN BE SALVAGED RECOGNIZED OR USED BY THE ENEMY BURN ALL PAPERS AND BOOKS MEANS 1 Explosives when provided 2 Hammers axes sledges or whatever heavy object is readily available 3 Burning by means of incendiaries such as gasoline oil paper or wood 4 Grenades and shots from available arms 5 Where possible and when time permits bury all debeis or dispose of it in streams or other bodies of water PROCEDURE 1 Obliterate alf identifying marks Destroy nameplates and circuit labels 2 Demolish all panels castings switch and instrument boards 3 Destroy all controls switches relays connections and meters 4 Rip out all wiring in electrical equipment Smash gas oil and water cooling systems in gas engine generators etc 5 Smash every
7. A Power are located on the back of the removable cover b Many of the units are provided with shock mount ings to protect the internal circuits Any defects or loosen ing of the mounting should be called to the attention of the radio maintenance crew 7 ADJUSTMENT Radio Set SCR 720 A will be tested and adjusted at regulat intervals by the specially trained radio main tenance crew using test equipment provided for the purpose adjustments that to be made by the operator will be described under Section III Operation and no others should be attempted except under emer gency conditions when the services of the radio main tenance crew are not available RESTRICTED N 3 RESTRICTED AN 08 10 181 Section 11 Paragraphs 8 9 SECTION 8 GENERAL d The operation of this equipment draws a large amount of current from the aircraft supply system There fore the equipment should operated unless the aircraft engines are turning up to normal speed Opera tion of this equipment when the aircraft engines not turning up to normal speed will discharge the bat teries in a very short time There should be no occasion for the operator to start this equipment on the ground However if this should be necessary proper instruc tions for accomplishing this without damage to the airplane system can be obtained from the radio main tenance crew b
8. RADIOMAN TO BE PREPARED TO GIVE ADEQUATE FIRST AID AND THEREBY PREVENT AVOIDABLE LOSS OF LIFE YOUR OWN LIFE MAY DEPEND ON THIS Do These Three Things First in Any Emergency Requiring First Aid 1 Send for a doctor or carry the victim to a doctor back apply artificial respiration immediately and continue WITHOUT STOPPING until normal breathing returns 1 iv Straddle victim across thighs Place the palms of your hands on the victim s back so that the little fingers of each hand just touch the victim s lowest ribs 2 Keep victim warm and quiet and flat on his 3 If breathing has stopped apply artificial respiration Stop all serious bleeding Ora TEN pronounces the victim dead SPEED ARTIFICIAL RESPIRATION IS ES SENTAL Prone Pressure of Artificial Respiration if Due to Electric Shock PROTECT TOURSEDE with DRY insulating ma terial BREAK THE CIRCUIT by opening the power switch or pulling the victim free of the live conductor DON T TOUCH THE VICTIM WITH YOUR BARE HANDS UNTIL THE CIRCUIT IS BROKEN SPREAD DRY BLANKET THE GROUND and roll victim to center of blanket with his arms extended over his head so that he lies FACE DOWN on blanket BEND ONE OF THE VICTIM S ARMS at the 6 cibos and rest victim s cheek on iie back of his hand REMOVE FALSE TEETH gum tobacco food etc from victim s mouth LOOSEN
9. between units are car ricd through flexible cables Some of the cable ends terminate in plug and socket connectors while others ate fastened permanently to a particular unit It is the opera tor s duty to check the condition of all cable connectors except those terminating in the nose of the aircraft before cach flight and tighten the locking rings if necessary It is particularly important to check the cable connections to Radio Frequency Unit BC 1091 A b Radio Set SCR 720 A is connected to the aircraft 24 28 volt d c system by a flexible cable from the regular air craft junction box to Inverter Unit PE 218 A PE 218 B or 118 Provisions are made through an auxiliary junction box for connecting a portable d c generator to this cable during operation on the ground see Para graph 8 6 COMPONENT UNITS GENERAL _ All the units with the exception of the antenna are inclosed in dust covers for protection of the equipment and to prevent the operator from coming in contact with the high voltage circuits dust covers except the one for the inverter unit and Junction Box JB 98 A Power will be removed only by the specially trained radio main tenance crew The for the inverter unit is removable after disengaging the snap fasteners Do not attempt this procedure unless the POWER OFF button has been depressed and the inverter is not running Replacement fuses for the inverter unit and Junction Box JB 98
10. contact with high voltage electrical equipment fire or friction require immediate attention 1 Apply of the following a Tannic acid jelly b Butesin picrate Paste made with baking soda and water 4 Very strong cool tea 2 Applications should be LIBERAL and the burned area covered with STERILE GAUZE gt 5 If clothing sticks to the burned area DO NOT AT TEMPT TO REMOVE IT Treat burn as above 4 Keep th victim WELL COVERED and LYING FLAT ON HIS BACK Soothe and reassure him Obtain the services of DOCTOR AS SOON AS POSSIBLE A Always obtain the services of a doctor as quickly as possible vi RESTRICTED _ RESTRICTED 08 10 181 TABLE OF CONTENTS RESTRICTED Section Page I DESCRIPTION 1 General TRENT TT TU pute 1 2 Component Units 1 INSTALLATION AND ADJUSTMENT 3 General suis ti ee nd 3 4 Power Supply TE ce as 3 5 Ifiter Unit Connections na IMS Mont 3 6 Component Units General Hase 3 7 Adjustment a ee ee oe 3 IH OPERATION 8 General nme ORE lis 9 Procedure for Placing Equipment In Operation ER 5 10 Procedure for Turning the Equipment 9 11 Precautions During Operation ui I 9 IV General HQ 11 13
11. i INTENSITY ILLUMINATION _ CONTROL CONTROL CONTROL en 4 Indicator BC 1152 A Pilot s q RESTRICTED RESTRICTED AN 08 10 181 dd Turn the AFC switch 13 of Figure 2 to OFF and readjust the RCVR FREQ control 8 for a sharp pattern on the indicator screen 25 of Figure 3 Return the AFC switch 13 of Figure 2 to ON NOTE With proper pre flight adjustments by the radio maintenance crew it should be possible to turn the AFC switch 13 of Figure 2 from ON OFF and vice versa with no discernible change in the image If the image with the AFC switch ON is unsatisfactory the system should be placed under control of manual tuning by setting the AFC switch 13 on OFF and the radio maintenance crew should be consulted as soon as practicable ee If beacon service is desired set the RADAR BEACON switch 12 of Figure 2 in the BEACON position NOTE It may be necessary to readjust the RCV R FREQ control 8 for optimum results The transmit ter current should read approximately 12 milli amperes in beacon service Care should be taken to adjust the RCVR FREQ control to tune the receiver on beacon transmitter pulses from the housing station and NOT on beacon echo pulses from the radar transmitter ff With proper pre flight adjustments by the radio maintenance crew adjustments of th following controls should be unnecessary ADJ AZIM SWEEP OPR B ADJ AZIM SWEEP OPR C ADJ EL
12. ALL TIGHT CLOTHING as belts or collars COVER VICTIM LOOSELY by wrapping the ends of the blanket around him STRADDLE VICTIM across thighs PLACE THE PALMS OF YOUR HANDS ON VIC TIM S BACK so that the little fingers of each hand just touch the victim s lowest ribs 2 Keep your arms stiff and straight and swing your body forward allowing _ your weight to bear down on victim DO NOT PUSH OR USE FORCE 3 Swing hack at once to relieve Pressure and then continue the rhythmic application of alternate pressure and release Blanket is not shown in above drawings for the sake of clarity RESTRICTED RESTRICTED AN 08 10 181 10 KEEP YOUR ARMS STIFF AND STRAIGHT and swing your body forward allowing your weight to bear down on the victim 11 DO NOT PUSH OR USE FORCE 12 SWING BACK AT ONCE RELIEVE PRES SURE 13 REPEAT Number 10 14 REPEAT Number 12 15 CONTINUE as above maintaining steady rhythm until victim regains consciousness is pronounced dead by a doctor 16 CONTINUE ARTIFICIAL RESPIRATION even after victim begins to and until he becomes conscious 17 IF BREATHING STOPS AGAIN continue artificial respiration at once 18 DO NOT GIVE UP HOPE of reviving the victim Four hours or more of continuous application of artificial respiration may be required before con sciousness returns 19 FORCE LIQUIDS down
13. EV SWEEP PILOT ADJ ELEV SWEEP Figure 2 ADJ RANGE SWEEP ZERO ADJ RANGE SWEEP AMPL H CNTR Type C indicator CNTR Figure 3 H CNTR Type B indicator Section lii Paragraphs 9 11 H CNTR V CNTR AZIM If these controls need adjustment SOMME the radio main Figure 4 _ tenance crew gg The TILT LIMITS switch 7 of Figure 1 may now be p sitioned for any choice of four antenna tilts 10 PROCEDURE FOR TURNING THE EQUIPMENT OFF Turn the RCVR GAIN control 10 of Hate 2 to the extreme counterclockwise position b Stop antenna rotation by placing the ANTENNA ROTATION switch 6 of Figure 1 in the OFF position Turn transmitter off by pushing the OFF button on the TRANSMITTER switch 4 of Figure 1 4 Stop the inverter and place the entire equipment out of operation by pushing the OFF button of the POWER switch 2 of Figure 1 11 PRECAUTIONS DURING OPERATION a Do not hold the TRANSMITTER button in the position more than 3 or 4 seconds if the transmitter will not stay on b Turn the equipment immediately if any abnormal operation is observed Do not remove the connectors from any unit unless all switches are in the OFF position 4 Keep the average intensity on both indicators as low as possible for satisfactory performance Intense station ary spots on the indicator screen will burn the material on the face of the cathode ray tube e If the aircraft power
14. RESTRICTED 08 10 181 FOR OFFICIAL USE ONLY A P 2585A DIST 4 FILE BG HANDBOOK OF OPERATING INSTRUCTIONS FOR RADIO SET SCR 720 A and RADIO SET SCR 720 B 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 trans mission the revelation of its contents in any manner to an unauthorized person Is prohibited by law AR 360 5 ARTS 7514 amp 76 U S N REGS 19201 The information contained in restricted documents and the essential characteristics of restricted material will not be communicated to the public or to the press but may be given to any person known to be in the service of the United States and to persons of undoubted loyalty and discretion who are cooperating in Government work NOTICE For Official Use Only Not to be communicated to anyone outside His MY Servico Not to be published The information given in this is not to be communicated elther directly or indirectly to the press or to any person not holding an official position in His Majesty s Service 00000000000 m dm JUNE 15 1943 RESTRICTED AN 08 10 181 Published by joint authority of the Commanding General Army Air Forces and the Commanding General Army Service Forces THIS PUBLICATION MAY BE USED BY PERSONNEL RENDERING SERVICE TO THE UNITED STATES OR ITS ALLIES Paragraph 5 4 of Army Regu
15. RTER WILL NOT START Remove the hous ing cover on the inverter unit and replace the 10 ampere fuse RESTRICTED n RESTRICTED AN 08 10 181 CABLE cag SABLE A SS m s rch Eu m 2 m M Y Y fas TEST PLUG B Eu 3 29 30 31 32 33 34 35 36 27 CABLE ANTENNA AZIMUTH MOTOR RECTIFIER RA 90 A HSV RADIO MODULATOR BC 1142 A amp C RADIO FREQUENCY UNIT BE 1091 A 31 107 5A 15V TEST SET 32 1 08 5A 115 RECTIFIER RA 88 A 2 SYNCHRONIZER d BC 1148 A 33 109 10A 15 EXTERNAL EQUIPMENT 34 110 5A 24V CONTROL CIRCUIT S IN SYNCHRONIZER A GE BC 1148 A CONTROL BOX 1150 35 111 15A 24 RADIO MODULATOR BC 1142 A amp 27522 RACIO FREQUENCY UNIT 9 36 112 15 24V TEST SET 37 113 15A 38 14 5A 28 60A 29 1105 2 30 1106 15A 24V ANTENNA AZIM 8 ELE POTS 24V SPARE Figure 5 Junction Box JB 98 A RESTRICTED CABLE 7 e Io K ES CABLE 8 CABLE I2 CABLE CABLE
16. an un conscious person s throat He will drown 20 ALWAYS WAIT UNTIL CONSCIOUSNESS RE TURNS before administeting liquid stimulants 21 RECOMMENDED STIMULANTS ARE Hot black coffee Strong hot tea Aromatic spirits of one teaspoonful to a glass of water 22 GIVE ONLY ONE STIMULANT which should be sipped slowly 23 ALCOHOLIC DRINKS are not recommended un less absolutely nothing else is available 24 WHEN VICTIM HAS RETURNED TO SCIOUSNESS allow him to lie quietly where is for at least one hour taking care that he is well covered and free from wotty 25 IF POSSIBLE CARRY OR HAVE HIM CARRIED TO A DOCTOR WOUNDS Neglected wounds can have serious consequences Any break in the skin is a wound Paint small cuts scratches immediately with TINCTURE OF IODINE Deep cuts and wounds should be KEPT CLEAN but DO NOT use Tincture of Iodine on them Washing AROUND and AWAY FROM the wound with ordinary soap and water if no other antiseptic is available is recommended Other antiseptics for use on deep wounds are Violet gentian Potassium permanganate Tincture of Merthiolate or ordinary baking soda and water Cover the wound with a sterile gauze dressing and hold in place with adhesive tape or a strip of gauze In cases of serious bleeding when an artery has been cut firm pressure is necessary to stop the flow of blood Arterial bleeding is BRIGHT RED and comes fr
17. el of Synchronizer BC 1148 A 6 RESTRICTED RESTRICTED AN 08 10 3181 may not be working in which case the transmitter should not turned on Consult the radio maintenance crew NOTES the transmitter As troed on with no keep alive voltage the crystal will be destroyed If the transmitter is turned on with the INTENS control full clockwise the indicator screen will be damaged See Paragraph 11 d t Turn the RANGE STATUTE MILES switch 34 D of Figure 2 to the third position from the extreme left hand position The antenna should turn at a relatively high rate f speed 24V INDI C TOR SCREEN SCALE Section Hl Paragraph 9 u After the inyerter has been on for two minutes push the ON button 3 of the TRANSMITTER switch turn on the transmitter See Figure 1 The meter 23 should indicate roximately 17 milliamperes Should the meter indication be in excess of 20 milliamperes turn the transmitter OFF by pushing the OFF button 4 of the TRANSMITTER switch and consult the radio main tenance 4 the INTENS control 19 and the FOCUS control 20 of Figure 3 slowly clockwise to obtain a satisfactory sweep indication on the adjoining indicator screen mE w Turn the RCVR GAIN control 10 of Figure 2 28 INDICATOR SCREEN ILLUM FOCUS INTENS INTENS 16 m 18
18. electrical or mechanical part Whether moving or fixed 6 Break up all operating instruments such as keys phones microphones etc 7 Destroy all classes of carrying cases straps containers etc RESTRICTED RESTRICTED AN 08 10 T81 SAFETY NOTICE OPERATION OF THIS EQUIPMENT INVOLVES THE USE OF HIGH VOLTAGES WHICH ARE DANGEROUS TO LIFE ADEQUATE SAFETY MEASURES HAVE BEEN TAKEN TO INSURE SAFETY OPERATING PERSONNEL THE FOLLOWING RULES MUST BE OBSERVED IN ORDER TO TAKE FULL ADVANTAGE OF THESE PRECAUTIONARY MEASURES 1 DO NOT DISCONNECT ANY CABLES OR MAKE ANY ADJUSTMENT UNLESS ALL SWITCHES ARE OFF 2 FOLLOW THE PROPER STARTING SEQUENCE AT ALL TIMES 3 DO NOT RE MOVE ANY UNIT FROM ITS CASE FOR ANY REASON WHA VER WHEN POWE IS TURNE D ON ALL INTERNAL ADJUST MENTS REQUIRE USE OF SPECIAL TEST EQUIPMENT AND SUCH ADJUST ME NTS MUST BE PERFORMED BY A SPECIALLY TRAINED SERVICE MAN 4 RE AD AND UNDE RSTAND ALL OR THE INSTRUCTIONS BEFORE ATTEMPTING OPERATION OF THIS EQUIPMENT RESTRICTED i _ When from any cause whatever breathing has stopped RESTRICTED 08 10 181 FIRST AID PERSONNEL ENGAGED IN THE INSTALLATION OPERATION AND MAINTENANCE OF THIS EQUIPMENT OR SIMILAR EQUIPMENT ARE URGED TO BECOME FAMILIAR WITH THE FOLLOWING RULES BOTH IN THEORY AND IN THE PRACTICAL APPLICATION THEREOF IT IS THE DUTY OF EVERY
19. ics Navy Department Washington D C British units requiring additional copies should submit demands on Form 294A in duplicate to the Air Publications and Forms Store New College Leadhall Lane Harrogate Yorkshire England RESTRICTED RESTRICTED AN 08 10 181 UNSATISFACTORY REPORT FOR U S ARMY AIR FORCE PERSONNEL In the event of malfunctioning unsatisfactory design or unsatisfactory installation of any of the component units of this equipment or if the material contained i in this book is considered inadequate or erroneous an Unsatisfactory Report AAF Form No 54 or a report in similar form shall be submitted in accordance with pro visions of Army Air Force Regulation No 15 54 listing 1 Station and organization 2 Nameplate data type number or Eom prete nomenclature T naffieplate is not attached to the equipment Date and nature of failure Airplane model and serial number Remedy used or proposed to prevent recurrence Handbook errors or inadequacies if applicable CN FOR U 5 NAVY PERSONNEL Report of failure of any part of this equipment during its guaranteed life shall made on Form N Aer 4112 Report of Unsatisfactory or Defective Material or a report in similar form and forwarded in accordance with the latest insttuctions of the Bureau of Aeronautics In addition to other distribution required one copy shall be furnished to the inspector of Naval Material
20. king replacements The radio maintenance crew should be notified of all blown and replaced fuses 14 INDICATOR BC 1151 A a NO INDICATION ON SCREEN RCVR GAIN control 10 of Figure 2 may be set too low INTENS control 19 of Figure 3 may be set too low Fuse 1108 32 in Junction Box JB 98 A of Figure 5 may be open b SWEEP LINE DOES NOT MOVE ACROSS IN DICATOR SCREEN WHEN ANTENNA TION SWITCH 6 OF FIGURE 1 IS IN THE ON POSITION Replace fuse 1101 28 in Junction Box JB 98 A of Figure 5 If the aritenna rotates but the sweep remains stationary the azimuth potentiometer circuit is probably at fault Replace fuse 1113 37 in Junction Box JB 98 A of Figure 5 If this does not clear up the difficulty the radio maintenance crew should be consulted INDICATOR PICTURE DOES _ CORRELATE WITH TILT LIMITS SWITCH SET TING Microswitches on the antenna may have failed There may be improper antenna connections Consult the radio maintenance crew d INDICATIONS FADE ABRUPTLY DURING NORMAL OPERATION Check transmitter current Check crystal current INDICATIONS FADE GRADUALLY If oper ating manually that is without AFC retune receiver with _ RCVR FREQ control 8 of Figure 2 and re check occa sionally during operations Check crystal current If operating with AFC change to operation without AFC and retune for maximum indication Con
21. lation 380 5 relative the handling of restricted printed matter is quoted below Dissemination of restricted matter The information contained in restricted documents and the essential characteristics of restricted material may be given to any person known to be tbe service of tbe United States and to fersons of undoubted loyalty and discretion who are sooptrating i dem in Government work but will not be communicated to the public or to the press except by authorized military public relations agencies This permits the Issue of restricted publications to civilian contract and other accredited schools engaged in training personnel for Government wotk to civilian concerns contracting for overhaul and repair of aircraft of aircraft accessories and to similar commercial organizations LIST OF REVISED PAGES ISSUED NOTE A heavy black vertical line to the left of the text on revised pages indicates the extent of the revision This line is omitted where more than 50 percent of the page is revised ADDITIONAL COPIES of this publication may be secured on Requisition AAF Form 102 as prescribed Keguixtions 15 102 Submit requisitions to Commandiag General Air Service Command Patterson Field Fairfield Ohio Also see T O No 00 25 3 for details on distribution of Technical Orders Requests from Naval activities shall be submitted to Chief of che Bureau ef Aeronaut
22. nge setting while that on 26 INDICATOR SCREEN 21 RESTRICTED AN 08 10 181 indicator screen 26 of Figure 4 will disappear due to a change in the functioning of the oscilloscope It prob ably will be necessary to readjust the V CENTR control on the indicator screen after this operation so that the transmitted pulse will coincide with the 0 point of the scale In addition check that the proper lamp 27 is lit bb Select suitable target in the upper portion of the indicator screen 25 of Figure 3 Set the RANGE dial 9 of Figure 2 to correspond approximately to the lower extremity of the target Turn the RANGE LIGHT INTENS control 11 of Figure 2 slowly clock wise to suitably illuminate the range scale and turn the RANGE MARKER INTENS control 15 clockwise until a moderately bright range line appears on the indi cator screen 25 of Figure 3 Adjust the RANGE dial 9 of Figure 2 if necessary to make the range line on the indicator screen 25 tangent to the lower extremity Of the target selected cc Check that the target selected on the indicator screen 26 of Figure 3 appears in the proper position on the indicator screen 26 of Figure 4 Obtain a suitable pat tern the indicator screen 24 of Figure 3 by slowly turning the INTENS control 17 clockwise and adjust ing the FOCUS control 16 for a sharp pattern 27 RANGE LAMPS 22 _ SCALE _ Focus
23. ockwise as necessary to determine _ whether a small spot of light travels across the screen 24 in the direction from left to right It may be neces _ to adjust the CENTR control of Figure 3 to bring this spot of light to the visible portion of the screen Return the control immediately to its full counterclock wise position If no spot appears the high voltage recti fiet which supplies the indicators and the keep alive RESTRICTED 5 Section Ill d RESTRICTED AN 08 10 181 23 mo 2 _ TRANSMITTER CURRENT 3 4 POWER POWER OFF CRYSTAL CURRENT TRANSMITTER ON TRANSMITTER OFF SWITCH SWITCH MILLIAMMETER SWITCH SWITCH WARNING gt POWER SWITCH MUST BE ON FOR ONE MINUTE BEFORE OPERATION OF TRANSMITTER SWITCH TRANSMITTER CURRENT PRESS TO RE Ab CRYSTAL CURRENT itj TRANSMITTER CURRENT ANTENNA ROTATION P y CRYSTAL CURRENT gt MET SWITCH SELECTOR SWITCH SWITCH Figure 1 Panel of Control Box BC 1150 A a RECEIVER 2 ILLUMINATION TUNING _ RANGE CONTROL ON CONTROL DIAL _ RANGE SCALE Foz ora RANGE LIGHT ADL RANGE SWERP INTENS Zeno AMPL RADAR Y RANGE MARKER OUTPUT OFF ADAR BEACON EIVER OFF T SWITCH gt STATUTE MARKER CONTROL P MILES INTENSITY SWITCH CONTRO Figure 2 Pan
24. om the wound in SPURTS with each beat of the heart Bleeding from a vein is DARK RED and flows steadily Pressure is not often needed for venous bleeding Pressure is applied ABOVE the wound or between the WOUND AND THE HEART to stop ARTERIAL BLEEDING Pressure is applied BELOW the wound AWAY FROM THE HEART to stop VENOUS BLEEDING Pressure is best applied and maintained by means of a TOURNIQUET A TOURNIQUET is a strip of cloth bandage or other material tied ABOVE the wound Tie a simple double knot in the cloth and place a strong stick or other rigid member in the loop thus made then tighten the knot by pulling the ends of the cloth Tourniquet in position ABOVE wound RESTRICTED 00 s RESTRICTED 08 10 181 With the rigid member thus held fena Base twist it until the bleeding stops DO NOT maintain such pressure longer than 5 min utes at a time u IF BLEEDING CONTINUES after loosening tourni quet allow the blood to flow for about 30 to 60 seconds and then re apply pressure Continue until bleeding stops AFTER BLEEDING HAS STOPPED the wound should be carefully covered with a sterile dressing DO NOT TOUCH WOUND OR DRESSING WITH DIRTY HANDS Keep the victim LYING FLAT ON HIS BACK AND WELL COVERED DO NOT LET HIM SEE HIS WOUND Divert his thoughts from himself Obtain the services of a DOCTOR AS SOON AS POSSIBLE BURNS Burns whether caused by
25. ponent of Radio Set SCR 720 B consists of an auto transformer relays and fuses This connects to the 80 volt 800 cycle a c system of airplanes containing this system and steps up the voltage to the required 115 volts for Radio Set SCR 720 B Radio Set SCR 720 B is used chiefly by the British In some British installations only the operator s indicator Indicator 1151 is used On this type of installation it is necessary to disregard the instructions on adjusting the pilot s indicator Indicator 1152 SECTION DESCRIPTION Section Paragraphs 1 2 1 GENERAL a It is assumed that the operator is thoroughly famil iar with the tactical use of this equipment The following instructions are to familiarize the operator with the man ual operation of the equipment in order that he may make the fullest use of its tactical applications b The life expectancy and proper performance of Radio Set SCR 720 A will be determined primarily by its treatment in the hands of the operator Therefore the instructions contained herein should be followed rigor ously to insure optimum performance under tactical application Any deviations from normal performance of Radio Set SCR 720 A should be called to the attention of the _ specially trained radio maintenance crew immediately 2 COMPONENT UNITS _ The operator normally will be concerned only with controls on the following units Control Box BC 1150 A
26. sult the radio maintenance crew as soon as practicable f INDICATIONS OBSCURED BY HIGH BACK GROUND INTENSITY Decrease intensity by adjust ing INTENS control 19 of Figure 3 Readjust RCVR GAIN control 10 of Figure 2 for maximum contrast 15 INDICATOR BC 1152 A GENERAL This indicator operates like indicator 25 of Figure 3 on some settings of the RADAR BEACON switch 12 and of the RANGE STATUTE MILES switch 14 of Figure 2 on other settings the in dicator operates like indicator 24 of Figure 3 b TROUBLES Sce Paragraph 14 this section 16 RADIO FREQUENCY UNIT 1091 a TRANSMITTER DOES NOT OPERATE NO TRANSMITTER CURRENT INDICATED ON M ETER 23 OF FIGURE 1 Replace fuses 1106 and 1111 30 and 35 respectively in Junction Box JB 98 A Power of Figure 5 b TRANSMITTER GOES ON MOMENTARILY AND THEN SHUTS DOWN Turn off transmitter wait one minute and then turn on transmitter again If transmitter docs not stay on do not attempt further Operation of the equipment but consult radio maintenance crew TRANSMITTER CURRENT LOW Check the airplane power supply Note generator voltage 17 EQUIPMENT RC 94 C a ANTENNA DOES NOT OPERATE Replace fuse 1101 28 in Box JB 98 A Power of Figure 5 b ANTENNA DOES NOT TILT AS DESIRED See Paragraph 14 c this section 18 INVERTER UNIT PE 218 A PE 218 B OR PE 118 A INVE
27. supply system should fail dut ing operation turn off the equipment immediately using the procedure of Paragraph 10 this section After the trouble has been remedied the equipment may again be put into operation by the procedure of Paragraph 9 In this event it will generally be unnecessary to carry out all steps in the procedure f Do not attempt adjustments of any of the controls specified in Paragraph 9 ff These adjustments require special testing technique and should be carried out only by the radio maintenance crew RESTRICTED 9 Section IV RESTRICTED AN 08 10 181 Paragraphs 12 18 SECTION IV SERVICING 12 GENERAL Many causes of faulty operation may be traced directly to loose connections A routine inspection of all cable connectors should be made Special emphasis is made with regard to the high voltage plugs These connectors must be tightly screwed together and kept clean particu larly the adjoining rubber faces of the plugs and jacks Should such a connector fail it will be charred by the arc and cannot be used again TURN OFF ALL SWITCHES BEFORE CHANGING CONNECTORS 13 FUSES The various units are fused in Junction Box JB 98 A of Figure 5 Spare fuses are provided in the removable cover of this unit The spare supply should be kept com plete at all times and replacements must be of the cotrect size and ampere rating for proper protection The equip ment must be off when ma
Download Pdf Manuals
Related Search