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T Y P E 1398-A PULSE G E N E R A T O R
SECTION
4
PRINCIPLES OF OPERATION
4.1 GENERAL.
(See
Figure
4-1.)
The Type 1398-A is composed of three basic s e c -
tions: (1) the input and prf oscillator circuit, (2) the
output pulse circuit, and
(3)
the power supply. T h e
first two sections are shown in block diagram form in
Figure 4-1.
Externally or internally generated positive pulses
from the input and prf oscillator circuit trigger the
output pulse circuit.
T h e output pulse circuit, in
turn, produces positive and negative pulses that ap-
pear a t the OUTPUT PULSE binding posts. A detailed
a n a l y s i s of e a c h circuit i s contained in the following
paragraphs.
4.2 INPUT AND PRF OSCILLATOR CIRCUIT
-
EXTERNAL OPERATION.
4.2.1 GENERAL.
L e t u s first consider the circuit a s a n aperiodic
input circuit, i.e., with the P R F switch s e t t o EXT
DRIVE, a s shown in Figure 4-2. In this mode, the cir-
cuit converts a n external signal, applied to the EXT
DRIVE binding p o s t s , t o
a
positive pulse, which ap-
pears a t the output, pin
6
of V102.
INPUT AND p R F - l
( -
OUTPUT PULSE CIRCUIT
FCILLATOR
CIRCUIT
1
-
3
-+DELAYED
SYNC
AMPLITUDE
V105
POWER
n
~ ~ s I T I v E
OUTPUT
STARTQlo3
----C
AMPLIFIER - $ & + C
-NEGATIVE
OUTPUT
V106
SYNC
POSITIVE SYNC
AMPLIFIER
V l O l B
Y
SYNC
Figure 4-1.
Block diagram
of
the T y p e 1398-A P u l s e Generator.
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