DEPARTMENT OF THE ARMY TECHNICAL MANUAL TM 11 …

1 DEPARTMENT OF THE army TECHNICAL MANUALTM 11-5820-256-20 DEPARTMENT OF THE AIR FORCE TECHNICAL ORDERTO 31R2-2 GRC26-132 ORGANIZATIONALMAINTENANCE MANUALRADIO SET AN/GRC-26 DThis copy is a reprint which includes current pages fromChanges 1 through OF THE army AND THE AIR FORCE5 JANUARY 1962 WARNINGDANGEROUS VOLTAGES EXIST IN THIS EQUIPMENTBe careful when working on the power supply circuits, the 115-volt ac line connections, or the240-volt plate circuits in Receiver, Radio R-390(*)/URR. Turn off power when working on thetransmitting antenna or the transmitting antenna terminals; high radio frequency voltages existat these 'T TAKE CHANCES!

2 EXTREMELY DANGEROUS VOLTAGESEXIST IN THE FOLLOWING UNITS:TRANSMITTER, RADIO T-368(*)/URT2,400-volt circuitsCONVERTER, FREQUENCY SHIFT CV-116(*)/URR620-volt circuitsWARNINGVENTILATIONThe shelter must be ventilated when occupied. Be sure to open the vents, window shutters, ordoor when the equipment is operated. Keep the shelter air intake fan closed duringtransportation. The truck exhaust stack is near the air intake vent and danger from carbonmonoxide poisoning exists. When the vehicle is moving, adequate air circulation exists throughthe shelter in force: C 1, C 2, C 3, C 4.

3 And C 5TM 11-5820-256-20C 5 CHANGEHEADQUARTERSDEPARTMENT OF THE , , 6 June 1975 organizational Maintenance ManualRADIO SET AN/GRC-2TM 11-5820-356-20, 5 January 1962, is changed as follows:General. Change the words second echelon wherever they appear in the TECHNICAL MANUAL to organizational .Page 1. Paragraph 1a. Delete paragraph designation a .Paragraph 1b and c are superseded as follows:NOTEFor applicable forms and records,see paragraph 2, TM Indexes of to latest issue of DA Pam 310-4 todetermine whether there are new editions, changes, oradditional publications pertaining to the to DA Pam 310-7 to determine whetherthere are modification work orders (MWO s) pertainingto the of Equipment Publications Improve-mentsThe reporting of errors omissions, and recommen-dations for improving this publication by the individualuser is encouraged.

4 Reports should be submitted on DAForm 2028 (Recommended Changes to Publicationsand Blank Forms) and forwarded direct to Commander,US army Electronics Command, ATTN: -AMSEL-MA-Q,Fort Monmouth, NJ 11. Paragraph 11d(1) change PU-294/G to read PU-474/M or PU-619/M. Paragraph 12a. Step 1, corrective measurementscolumn, change to read, Refer to tm 11 -6115-230-15or tm 11 -6115 275-15 Page 15. Paragraph 12d. Step 1, Correctivemeasures column, change to read, Refer to tm 11 -6115-230-15 or tm 11 -6115-275-15. Page 24. Add the following references in propernumerical 5-2805-259-14 Operator s organizational , DirectSupport, General SupportMaintenance MANUAL : Engine,Gasoline, 20HP; Military StandardModels (Model 4A084-2) FSN2805-985-3926 (Model 4A084-3)FSN 2805-872-5972TM 5-6115-275-15 Operator s organizational , DirectSupport, General Support, andDepot Maintenance MANUAL :Generator Set, Gasoline Engine10KW, AC, 120/208 V, 3 Phase,60HZ Skid Mounted (LessEngine).

5 Page 25. Delete the last itemPage 30. Section II, Part or Component column,second item, change Generator PU-294/G to read Generator PU-474/M or PU-619/M. 1}By Order of the Secretary of the army :FRED C. WEYANDG eneral, United States ArmyOfficial:Chief of StaffVERNE L BOWERSM ajor General, United States ArmyThe Adjutant GeneralDistribution:To be distributed in accordance with accordance with DA form 12-51, (qty rqr block no. 98) organizational maintenancerequirements for AN/GRC-262 Changes in force: C 1, C 2, C 3, and C 4TM 11-5820-256-20C 4 CHANGEHEADQUARTERSDEPARTMENT OF THE ARMYNO.

6 4 WASHINGTON, DC, 9 April 1975 organizational Maintenance ManualRADIO SET AN/GRC-26 DTM 11-5820-25620, 5 January 1962, is changed as follows:Inside front cover. Radiation warning is added after existing }WARNINGRADIATION HAZARDRADIOACTIVE MATERIALCONTROLLED DISPOSAL REQUIREDACCOUNTABILITY NOT REQUIREDSTD RW-2 Audio level level Tube Tube Tube Hazard Information: The following radiation hazard information must be read and understood by allpersonnel before operating or repairing Radio Set AN/GRC-26D. Hazardous radioactive materials are present inthe above listed components of the MD-239A/GR, R-390/URR, C-632/GRC-10, R-125/GRC-10, and T-235 components are potentially hazardous when broken.

7 See qualified medical personnel and the localRadiological Protection Officer (RPO) immediately, if you are expose to or cut by broken components. First aidinstructions are contained in TB 43-0116, TB 43-0122, and AR place radioactive components in your extreme care NOT to break radioactive components while handling them. NEVER remove radioactivecomponents from cartons until you are ready to use any of these components are broken, notify the local RPO immediately. The RPO will survey the immediatearea for radiological contamination and will supervise the removal of broken components.

8 The above listedradioactive components will not be repaired or of broken, unserviceable, or unwanted radioactive components will be accomplished in accordance withthe instructions in AR Order of the Secretary of the army :FRED C. WEYHANDG eneral, United States ArmyChief of StaffOfficial:VERNE L. BOWERSM ajor General, United States ArmyThe Adjutant GeneralDistribution:To be distributed in accordance with DA Form 12-51, (qty block No. 98). organizational maintenance requirements in force: C 1, C 2, C 3TM 11-5820-256-20C 3 CHANGEHEADQUARTERSDEPARTMENT OF THE ARMYNo. 3 Washington, , 4 June 1969 organizational Maintenance ManualRADIO SET AN/GRC-26 DTM 11-5820-256-20, 5 January 1962 Is changed as follows:Note.

9 The parenthetical reference to previous change(example: "page 1 of C 1") indicates that pertinentmaterial was published In that 2, paragraph 1. Delete subparagraph b (page 1of C 2) and reporting of errors, omissions and recom-mendations for improving this MANUAL by the individualuser is encouraged. Reports should be submitted on DAForm 2028 (Recommended Changes to DAPublications) and forwarded direct to CommandingGeneral, army Electronics Command, ATTN:AMSEL-ME-NMP-AD, Fort Monmouth, N. J. subparagraph c (page 1 of C 1) and to the latest issue of DA Pam 310-4 todetermine whether there are new editions, changes, oradditional publications pertaining to the to DA Pam 310-7 to determine whether there aremodification work orders (MWO's) pertaining to 2, line 5.

10 After "components" add: and theaddition of cryptographic 3, paragraph 5e, line 1. Delete "W-128" andsubstitute: 4, figure 1. On the left side of the illustration,delete callout "WIRE W-128" and substitute: WIRE 11, paragraph 11d(1), line 2. After "PU-294/G"add: or Generator Set, Gasoline Engine, TrailerMounted PU-474 12c, chart, step 1, Corrective measurescolumn. Delete "Refer to tm 11 -940A" and substitute:Refer to tm 11 -6115-204-10 or TM 13, step 9, Corrective measures column, line "W-128" and substitute: 32 and 33.