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Transmitter Tuning Unit TU-64-( ) is a modification of Transmitter Tuning Unit [[TU-7]], used to convert Radio Transmitter [[BC-375]] or Radio Transmitter [[BC-191]] into a barrage jammer for use against enemy communications and radio-controlled missiles.The center frequency of a 5 per cent barrage band can be adjusted to any point within the frequency range, permitting frequency operation of 3.85-6.31 mc.Use of this unit does not require any modification of Radio Transmitter BC-375. With the exception ofthe difference in frequency, it is the same as Trans-mitter Tuning Unit TU-60-().Power requirements are 1 ampere at 24 volts.No tube complement is used, and no test equip-ment has been assigned.POWER OUTPUT 100 WATTS FREQUENCY RANGE 3.85-6.31 MC.TYPE OF STGNAL AUDIO FREQUENCY WOBBULATED TRANSPORTATION AIRBORNE Transmitter