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                                              TM 11-6625-3146-14

              TECHNICAL MANUAL


           (NSN 6625-01-154-4844)

     This copy is a reprint which includes
     current pages from Change 1,


                DECEMBER 1985
                                                                                                       TM 11-6625-3146-14

CHANGE                                                                                                 HEADQUARTERS
                                                                                            DEPARTMENT OF THE APRMY
No. 1                                                                                        Washington DC, 15 June 1987

                                 OPERATORIS, ORGANIZATIONAL, DIRECT SUPPORT
                                  AND GENERAL SUPPORT MAINTENANCE MANUAL

                                           MODULATION METER, ME-505A/U
                                        (MARCONI INSTRUMENTS MODEL 2305)
                                              (NSN 6625-01-154-4844)

TM 11-6625-3146-14, 26 December 1985, is changed as follows:

1. Insert print date of 26 December 1985, on the front cover of the manual.
2. 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                                     Insert
                                 i through iv                               i through iv
                                 1-3 and 1-4                                1-3 and 1-4
                                 1-11 through 1-16                          1-11 through 1-16
                                 2-1 and 2-2                                2-1 and 2-2
                                 3-1 and 3-2                                3-1 and 3-2
                                 3-5 and 3-6                                3-5 and 3-6
                                 3-9 and 3-10                               3-9 and 3-10
                                 3-17 and 3-18                              3-17 and 3-18
                                 3-27 and 3-28                              3-27 and 3-28
                                 4-1 and 4-2                                4-1 and 4-2
                                 4-7 and 4-8                                4-7 and 4-8
                                 4-11 and 4-12                              4-11 and 4-12
                                 4-31 through 4-44                          4-31 through 4-44
                                 4-47 through 4-52                          4-47 through 4-52
                                 5-3 through 5-6                            5-3 through 5-6
                                 None                                       5-6.1/(5-6.2 blank)
                                 5-17 and 5-18                              5-17/(5-18 blank)
                                 5-43 and 5-44                              5-43 and 5-44
                                 B-5 through B-8                            B-5 through B-8
                                 None                                       Figure FO-25

3. File this change sheet in front of the publication for reference purposes.

                                 Distribution authorized to the Department of Defense mnd
                                 DOD contractors only for official use or for administration or
                                 operational purposes. This determination was mode on 17
                                 February 1987. Other requests for this document will be
                                 referred to Commander, US Army Communications-
                                 Electronics Command and Fort Monmouth, ATTN: AMSEIL-
                                 ME-P, Fort Monmouth, NJ 07703-5000.
                                 DESTRUCTION NOTICE-Destroy by any method that will
                                 prevent disclosure of contents or reconstruction of the
By Order of the Secretary of the Army:

                                                                             JOHN A. WICKHAM, JR.
                                                                            General, United States Army
                                                                               Official: Chief of Staff
               R.L. DILWORTH
     Brigadier General, United States Army
             The Adjutant General

   To be distributed in accordance with DA Form 12-36 literature requirements for ME-505/U.
    TM 11-6625-3146-14

                                                                             TM 11-6625-3146-14


HIGH VOLTAGE is used in the operation of this equipment. DEATH ON CONTACT
may result if personnel fail to observe safety precautions. Know the areas in this
equipment containing high voltage. Be careful not to come in contact with the high
voltage connections during operation of this equipment.
Do not be misled by the term "Low Voltage." Potentials as low as 25 volts may
cause death under adverse conditions.


FLAMMABLE SOLVENTS are used in the maintenance of this equipment. Adequate
ventilation should be provided while using isopropyl alcohol. Prolonged breathing
of the vapor should be avoided. The solvent is not to be used near heat, sparks,
or open flames; it is highly flammable. Since isopropyl alcohol dissolves
natural oils, prolonged contact with skin should be avoided. When necessary, use
gloves which are solvent-resistant. If the solvent is taken internally, consult a
physician immediately.

COMPRESSED AIR is used in the maintenance of this equipment. When used for
cleaning, the compressed' air source must limit nozzle pressure to no more than
29 pounds per square inch (PSIG). Goggles must be worn when cleaning with
compressed air.


Adequate        ventilation      should      be  provided        while      using
TRICHLOROTRIFLUOROETHANE. Prolonged breathing of vapor should be
avoided. The solvent should not be used near heat or open flame; the products of
decomposition are toxic and irritating. Since TRICHLOROTRIFLUOROETHANE
dissolves natural oils, prolonged contact with skin should be avoided. When
necessary, use gloves which the solvent cannot penetrate. If the solvent is taken
internally, consult a physician immediately.


TOXIC HAZARD: Many of the electronic components used in this equipment
employ resins and other chemicals which give off toxic fumes on incineration.
Appropriate precautions should therefore be taken in the disposal of these items.

                                                                                                     TM 11-6625-3146-14

                                                        CLASS 1

The symbol for static sensitive devices in military inventory is as depicted in the caution block above. The symbol used in
this authenticated manual is


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