AN-PRC-74B_C_serv_user_TM11-5820-590-12-1_1967.pdf

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1、TM 11-5820-590-12-1 TECHNICAL MANUAL OPERATORS AND ORGANIZATIONAL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS) RADIO SETS AN/PRC-74B (NSN 5820-00-935-0030) AND AN/PRC-74C (NSN 5820-00-177-1641); AND POWER SUPPLIES PP-4514/PRC-74 (NSN 5820-00-942-0821) AND PP-4514A/PRC-74 (NSN

2、5820-00-177-4581); AND BATTERY BOXES CY-6121/PRC-74 (NSN 5820-00-908-3127), AND CY-6314/PRC-74 AND CY-6314A/PRC-74 (NSN 5820-00-156-3934) This copy is a reprint which includes current pages from Changes 1 through 7. Title was changed to read as shown above by C 6. H E A D Q U A R T E R S , D E P A R

3、 T M E N T O F T H E A R M Y MARCH 1967 TM 11-5820-590-12-1 C 8 CHANGEHEADQUARTERS No. 8DEPARTMENT OF THE ARMY Washington, DC, 15 February 1988 Operators and Organizational Maintenance Manual (Including Repair Parts and Special Tools List) RADIO SETS AN/PRC-74B (NSN 5820-00-935-0030) AND AN/PRC-74C

4、(NSN 5820-00-177-1641) POWER SUPPLIES PP-4514/PRC-74 (NSN 5820-00-942-0821) AND PP-4514A/PRC-74 (NSN 5820-00-177-4581) BATTERY BOXES CY-6121/PRC-74 (NSN 5820-00-908-3127) CY-6314/PRC-74 (NSN 5820-00-935-0382) AND CY-6341A/PRC-74 (NSN 5820-00-156-3934) TM 11-5820-590-12-1, 3 March 1967, is changed as

5、 follows: 1.Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a vertical bar adjacent to the identification number. Remove pages Insert pages G and H . G and H i

6、and ii. i and ii 1-1 through 1-4. 1-1 through 1-4 3-4.1 and 3-4.2. 3-4.1 and 3-4.2 4-1 through 4-4. 4-1 through 4-4 6-1 and 6-2. 6-1 and 6-2 A-1. A-1/(A-2 blank) 2.File this change sheet in the front of the publication for reference purposes. Distribution authorized to the Department of defense and

7、DOD contractors only for official use or for administration or operational purposes. This determination was made on 3 November 1937. Other requests for this document will be referred to Commander, US Any Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-P, Fort Monmouth, NJ 07703-

8、5000. DESTRUCTION NOTICE-Destroy By any method that will prevent disclosure of contents or reconstruction of the document. By Order of the Secretary of the Army: OFFICIAL: CARL E. VUONO General, United States Army Chief of Staff R. L. DILWORTH Brigadier General, United States Army The Adjutant Gener

9、al DISTRIBUTION: To be distributed in accordance with DA Form 12-51 literature requirements for AN/PRC-74, A, B, C. TM 11-5820-590-12-1 C7 CHANGEHEADQUARTERS DEPARTMENT OF THE ARMY NO.7WASHINGTON DC, 1 October 1981 Operators and Organizational Maintenance Manual (Including Repair Parts and Special T

10、ools Lists) RADIO SETS AN/PRC 74B (NSN 5280-00-935-0030) AND AN/PRC -74C (NSN 5820-00-177-1641): AND POWER SUPPLIES PP-4514/PRC-74 (NSN 5820-00-942-0821) AND PP 4514A/PRC 74 (NSN 5820-00-177-4581); AND BATTERY BOXES CY 6121/PRC 74 (NSN 5820-00-908-3127), AND CY 6314/PRC 74 AND CY 6314A/PRC 74 (NSN 5

11、820-00-156-3934) TM 11-5820-590-12-1, 3 March 1967, is changed as follows: 1.New or changed material is indicated by a vertical bar in the margin of the page. 2.Remove and insert pages as indicated in the page list below: RemoveInsert i and ii . A through H iii and iv.i through iii 1-1 and 1-2 .1-1

12、3-3 and 3-4 .3-3 and 3-4 4-1 and 4-2 .4-1 and 4-2 None.3 2028-2 s w/Sample (back of Manual) 3.File this change sheet in the front of the manual for reference purposes. By Order of the Secretary of the Army: E. C. MEYER General, United States Army Official:Chief of Staff ROBERT M. JOYCE Brigadier Gen

13、eral, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form 12-51, Operator TM Literature requirements for AN/PRC-74. TM 11-5820-590-12-1 WARNING AVOID R. F. BURNS Do not touch the antenna when the radio set is being tuned or transmitting. WARNING DANGERO

14、US VOLTAGES EXIST IN THIS EQUIPMENT Be careful when working on universal power supply circuits or on ac line connections. WARNING DANGEROUS CHEMICALS ARE USED IN NICKEL-CADMIUM BATTERIES The electrolyte used in nickel-cadmium batteries contains potassium hydroxide (KOH), which is a caustic chemical

15、agent. Serious and deep burns of body tissue will result if the electrolyte comes in contact with the eyes or any part of the body. Use rubber gloves, rubber apron, and protective goggles when handling the electrolyte. If accidental contact with the electrolyte is made, use ONLY clean water and imme

16、diately (seconds count) flush contaminated areas. Continue flushing with large quantities of clean water for at least 15 minutes. Seek medical attention without delay. WARNING EXPLOSIVE GASES ARE GENERATED BY NlCKEL-CADMIUM BATTERIES Hydrogen and oxygen gases are generated in explosive proportions w

17、hile the nickel-cadmium battery is being charged. Charge the nickel-cadmium battery in a well-ventilated area to reduce concentrations of explosive gases. Turn off the battery charger before connecting or disconnecting the nickel-cadmium battery to prevent arcing. Do not use matches or an open flame

18、 in the charging area. Arcs, flumes, or sparks in the charging area will ignite the gases and cause an explosion. The battery box cover must be removed and the battery case vent plug (if used) must be open when charging. WARNING Remove all jewelry and wristwatches when working on batteries. Be extre

19、mely careful when using metal tools. WARNING Operator and maintenance personnel should be familiar with the requirements of TB SIG 291 before attempting installation or operation of equipment covered in this manual. Failure to follow requirements of TB SIG 291 could result in injury or DEATH. CAUTIO

20、N Do not use the whip antenna at 3.5 MHz or below. Use the components of Antenna Kit MK-911A/PRC-74. CAUTION Do not operate the radio set with one BA-4386/U. Use two BA-4386/Us in parallel at all times. Change 7 A TM 11-5820-590-12-1 CONDENSED OPERATING INSTRUCTIONS FOR RADIO SET AN/PRC-74B Receive

21、Mode a.Attach whip antenna mounting bracket to receiver-transmitter b.Install whip antenna and adjust to desired frequency range. c.Attach lead wire from whip antenna to front panel ANT terminal. d.Connect headset to either front panel AUDIO jack. e.The numbers (1) through (8) below are the same as

22、the numbers on the diagram. (1)Set front panel MC, 100 KC, 10 KC, and 1 KC selector knobs to the desired frequency. (2)Turn OFF-ON-TUNE switch to ON position. (3)Set RF GAIN control to maximum and adjust PEAK NOISE control for a definite, noticeable increase in noise heard in the headset. (4)Adjust

23、ANT LOAD and ANT TUNE controls for maximum noise heard in headset. (5)Press in CLARIFY/PUSH TO CALIBRATE knob and adjust so that a zero beat condition is observed in the headset (6)Release the CLARIFY/PUSH TO CALIBRATE knob and reset the pointer to midscale. (7)Set RF GAIN control for desired volume

24、 of received signal. (8)Adjust CLARIFY knob so that quality of received voice signals is natural. Transmit Mode f. Perform steps outlined above, do not perform steps (7) and (8) if no received signal is present. g. Connect either microphone or key (depending on mode of operation desired) to the rema

25、ining audio jack. h. The numbers (9) through (11) below are the same as the numbers on the diagram. (9)Turn OFF-ON-TUNE switch to the TUNE position and listen for tone in headset. (10)Adjust ANT TUNE knob to mid position. Adjust ANT LOAD knob until a maximum reading is obtained on ANT IND meter. Adj

26、ust ANT TUNE knob until a maximum reading is obtained on ANT IND meter. (11)Release OFF-ON-TUNE knob and allow to return to ON position. Note. Repeat-step h each time transmitting frequency is changed. i.Press microphone button and speak directly into the microphone. TM5820-590-12-1-C1-1 Change 7 B

27、C 2, TM 11-5820-590-12-1 CONDENSED OPERATING INSTRUCTIONS FOR RADIO SET AN/PRC-74C Receive Mode a.Attach whip antenna mounting bracket to receiver-transmitter. b.Install whip antenna and adjust to desired frequency range. c.Attach lead wire from whip antenna to front panel ANT terminal. d.Connect he

28、adset to either front panel AUDIO jack. e.The numbers (1) through (8) below are the same as the numbers on the diagram. (1)Set front panel MHz, 100 KHz, 10 KHz, and 1 KHz selector knobs to the desired frequency. (2)Turn OFF-ON-TUNE switch to ON position. (3)Set RF GAIN control to maximum and adjust

29、PEAK NOISE control for a definite, noticeable increase in noise heard in the headset. (4)Set ANT TUNE to mid range and ANT LOAD for maximum noise heard in headset. (5)Press in CLARIFY/PUSH TO CALIBRATE knob and adjust so that a zero beat condition is observed in the headset. (6)Release the CLARIFY/P

30、USH TO CALIBRATE knob and reset the pointer to midscale. (7)Set RF GAIN control for desired volume of received signal. (8)Adjust CLARIFY knob so that quality of received voice signals in natural. Transmit Mode f. Perform steps outlined above, do not perform steps (7) and (8) if no received signal is

31、 present. g. Connect either microphone or key (depending on mode of operation desired) to the remaining audio jack. h. The numbers (9) through (11) below are the same as the numbers on the diagram. (9)Turn OFF-ON-TUNE switch to the TUNE position and listen for tone in headset. (10)Adjust ANT TUNE kn

32、ob to mid position. Adjust ANT LOAD knob until a maximum reading is obtained on ANT IND meter. Adjust ANT TUNE knob until a maximum reading is obtained on ANT IND meter. (11)Release OFF-ON-TUNE knob and allow to return to ON position. Note.Repeat-step h each time transmitting frequency is changed. i

33、.Press microphone button and speak directly into the microphone. TM5820-590-12-1-C1-1 C TM 11-5820-590-12-1 SAFETY STEPS TO FOLLOW IF SOMEONE IS THE VICTIM OF ELECTRICAL SHOCK DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL IF POSSIBLE, TURN OFF THE ELECTRICAL POWER IF YOU CANNOT TURN OFF THE ELECTRICAL P

34、OWER, PULL, PUSH, OR LIFT THE PERSON TO SAFETY USING A WOODEN POLE OR A ROPE OR SOME OTHER INSULATING MATERIAL SEND FOR HELP AS SOON AS POSSIBLE AFTER THE INJURED PERSON IS FREE OF CONTACT WITH THE SOURCE OF ELECTRICAL SHOCK, MOVE THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY START ARTIFICIAL RES

35、USCITATION Change 7 D 3 2 1 5 4 5 4 TM 11-5820-590-12-1 FIXED OPERATION WITH LONG RANGE ANTENNAS WARNING TELESCOPING TYPICAL TOWER EXTENDD RANGEDOUBLET ANTEMMA ANTENNA MASTANTENNA NEVER ERECT THESE LONG RANGE ANTENNAS DIRECTLY UNDER POWERLINES. IF YOU MUST ERECT THESE LONG RANGE ANTENNAS NEAR POWERL

36、INES, POWERLINE POLES OR TOWERS, OR BUILDINGS WITH OVERHEAD POWERLINE CONNECTIONS. NEVER PUT THE ANTENNA CLOSER THAN TWO TIMES THE ANTENNA HEIGHT FROM THE BASE OF THE POWERLINE, POLE, TOWER, OR BUILDINGS. NEVER ATTEMPT TO ERECT ANY LONG RANGE ANTENNA WITHOUT A FULL TEAM. BEFORE ERECTING ANY LONG RAN

37、GE ANTENNA, INSPECT ALL THE PARTS MAKING UP THE ANTENNA KIT. DO NOT ERECT THE ANTENNA IF ANY PARTS ARE MISSING OR DAMAGED. DO AS MUCH OF THE ASSEMBLY WORK AS POSSIBLE ON THE GROUND. WHEN ERECTING THE ANTENNA, ALLOW ONLY TEAM PERSONNEL IN THE ERECTION AREA. MAKE SURE THAT THE AREA FOR THE ANCHORS IS

38、FIRM. IF THE GROUND IS MARSHY OR SANDY, GET SPECIFIC INSTRUCTIONS FROM YOUR CREW CHIEF OR SUPERVISOR ON HOW TO REINFORCE THE ANCHORS. WHEN SELECTING LOCATIONS FOR ANCHORS, AVOID TRAVELED AREAS AND ROADS. IF YOU CAN NOT AVOID THESE AREAS, GET SPECIFIC INSTRUCTIONS FROM YOUR CREW CHIEF OR SUPERVISOR A

39、S TO WHAT CLEARANCE YOUR GUY WIRES AND ROPES MUST HAVE OVER TRAVELED AREAS AND ROAD. CLEARLY MARK ALL GUY WIRES AND ROPES WITH THE WARNING FLAGS SUPPLIED BY YOUR UNIT. IN AN EMERGENCY, USE STRIPS OF WHITE CLOTH AS WARNING STREAMERS. IF YOU SUSPECT THAT POWERLINES HAVE MADE ACCIDENTAL CONTACT WITH YO

40、UR ANTENNA, STOP OPERATING, ROPE OFF THE ANTENNA AREA, AND NOTIFY YOUR SUPERIORS. IF THE WEATHER IN YOUR AREA CAN CAUSE ICE TO FORM ON YOUR LONG RANGE ANTENNA AND ITS GUY WIRES AND ROPES, ADD EXTRA GUYS TO SUPPORT THE SYSTEM. ROPE OFF THE AREA AND POST IT WITH WARNING SIGNS LIKE BEWARE OF FALLING IC

41、E” . DO NOT TRY TO ERECT ANY ANTENNA DURING AN ELECTRICAL STORM. KEEP A SHARP EYE ON YOUR ANCHORS AND GUYS. CHECK THEM DAILY AND IMMEDIATELY BEFORE AND AFTER BAD WEATHER. Change 7 E TM 11-5820-590-12-1 WARNING SERIOUS INJURY OR EVEN DEATH CAN HAPPEN IF THE FOLLOWING ARE NOT CAREFULLY OBSERVED WHEN I

42、NSTALLING AND USING THE ANTENNAS USED WITH YOUR RADIO SETS DO NOT STOP YOUR VEHICLE UNDER POWERLINES. IF POSSIBLE, TRY TO MAINTAIN MOBILE COMMUNICATIONS WITH YOUR ANTENNA(S) TIED DOWN. MAKE SURE AN ANTENNA TIP CAP IS SECURELY TAPED ON THE END OF EACH WHIP ANTENNA. DO NOT LEAN ACROSS OR TOUCH A WHIP

43、ANTENNA WHILE THE TRANSMITTER IS ON. DURING CROSS-COUNTRY OPERATION, DO NOT ALLOW ANYONE TO STICK AN ARM, LEG OR WEAPON OVER THE SIDES OF THE VEHICLE. IF YOUR ANTENNA ACCIDENTALLY TOUCHES A POWERLINE AND A LEG, ARM, OR WEAPON CONTACTS THE DAMP BUSH OR THE GROUND, A SERIOUS OR FATAL ACCIDENT CAN HAPP

44、EN. IF YOU ARE NOT SURE THAT AN ANTENNA ON YOUR VEHICLE WILL CLEAR A POWERLINE, STOP BEFORE YOU GET CLOSE TO THE POWERLINE AND EITHER CAREFULLY TIE DOWN THE ANTENNA OR REMOVE ANTENNA SECTIONS TO MAKE SURE THAT YOU CAN SAFELY DRIVE UNDER THE POWERLINE. Change 7 F TM 11-5820-590-12-1 WARNING Remove th

45、e magnesium battery from Battery Box CY-6314( )/PRC-74 when the RT-794/PRC is not being used. This is required to insure that hydrogen gas (a by-product of Magnesium Battery, BA-4386/U Discharge Action) does not accumulate. Personnel may be injured and equipment damaged if the gas explodes. WARNING

46、You can tell the difference between Magnesium Battery, BA-4386, and Lithium Battery, BA-5598, by looking at their size. The Lithium Battery is half the size (smaller than) of the Magnesium Battery WARNING P P-4514/PRC-74 GROUND THE INSTRUMENT To minimize shock hazard, the instrument chassis and cabi

47、net must be connected to an electrical ground. The instrument is equipped with a three conductor ac power cable. The power cable must either be plugged into an approved three contact electrical outlet or used with a three contact to two contact adapter with the ground wire (green) firmly connected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of the power cable must meet International Electrotechnical Commission (IEC) safety standards. WARNING DO not atte