Lesson 2/Learning Event 6
b. Characteristics. This test set is entirely solid state, and is so
constructed that a wired circuit board is inserted to obtain the code
characteristics desired; that is, one board is used for the Baudot code
and a separate board is used for the ASCII code.
The codes are not
selectable merely by front panel switches. The circuit boards are easily
(1) Signal types. Pulses may be transmitted either neutral or polar by
changing the strapping on the rear of the unit. Dry contact keying only
is provided; all loop battery must be supplied externally.
(2) Push buttons. Push buttons select the code character combination.
Only the first five are used for Baudot code, while all eight are used for
the ASCII data code.
Establishes the mode of operation.
each time a trigger pulse is received
from the clock in the data analyzer.
generates the selected format at the
selected modulation rate.
is not used.
character of the selected format, at
a trigger pulse is received from the
The transmitter generates a continuous
There is no provision in
this test set to transmit a steady
In a neutral circuit, it is
only necessary to open the loop for