Figure 2-2. Dual NDB Transmitter System

TM 11-5825-271-34

b. The NDB transmitter is a crystal-controlled,

letter station identification code. The unit can also be

operated with continuous tone or without a tone for

fixed-tuned unit which operates within the frequency

maintenance. An external voice input can be used with

range of 190 kHz to 535 kHz, and provides a 50-watt

any three of the aforementioned modes.

(maximum) output. When in the beacon mode, the

c. If an abnormal operating condition results in loss

carrier frequency is amplitude modulated by an internally

of keying or causes the carrier and/or modulation level to

generated 1020 Hz or 400 Hz tone which is keyed on

fall below preset threshold levels, automatic shutdown of

and off by a preprogrammed two or three

2-2