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TM 11-5825-271-34
Section V. DETAILED FUNCTIONAL DESCRIPTION,
CHANGE-OVER UNIT
transmitter. This removes the ac line and battery supply
2-26. Change-Over Unit
from the standby NDB transmitter, connects the battery
(fig. FO-12)
supply to the main NDB transmitter, and connects the
a. The change-over unit is used only in dual
main NDB transmitter rf output to the ATU.
transmitter systems. In the case of a shutdown of the
c.  In the event of a failure of the main NDB
main  NDB  transmitter,  the  change-over  unit
transmitter, the 48V supply at TB2-1 is not present and
automatically switches on the standby NDB transmitter.
relays K1/K2 are deenergized. This connects the ac line
The rf outputs of the two NDB transmitters (main and
and battery supply to the standby NDB transmitter and
standby) are applied to the change-over unit and the
connects the standby NDB transmitter rf output to the
switched rf output of the change-over unit is applied to
ATU. Diodes CR3 and CR4 provide isolation between
the ATU.
the + 24 Vdc supplies from the two NDB transmitters The
b. Relay K1 switches the NDB transmitter outputs
ATU supply is always taken from the NDB transmitter
to the ATU, and K2 provides control function switching.
that is on.
During normal operation, both K1 and K2 are energized
by  the
48V
supply  from
the
main
NDB
2-12


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