TM 11-6625-2398-15-2
CHAPTER 5
FUNCTIONING
When circuit breaker 1A1A1CB3 or 1A1A1CB4 is
5-1. General
actuated, the primary ac power is applied to contacts of
The operation of interface adapter unit 1A1A1, and of
relay 1A1A1K1. Relay 1A1A1K1 is operated when
hybrid attenuator 2A1, are described in this chapter. The
FREQUENCY SELECT switch 1A1A1S4 is set to either
operation of the remaining components of group I and
60 Hz or 400 Hz.
FREQUENCY SELECT switch
group 2 is self-evident.
1A1A1S4 and relay 1A1A1K1 provide the primary ac
operating power to the active circuits within the interface
5-2. Interface Adapter Unit 1A1A1
adapter unit. When primary operating power is applied
(fig. 6-1 )
to interface adapter unit 1A1A1, POWER ON indicator
The interface adapter unit can be divided into five
lamp 1A1A1DS3 is lighted.
functional sections. These functional sections are as
follows:
5-5. Antenna and Azimuth Data
a. Group case power.
(fig. 6-1)
b. Power.
a. General. The antenna and azimuth data circuits
c. Antenna and azimuth data.
consist of an antenna rotation circuit and an azimuth
d. Test points.
data circuit. The antenna rotation circuit consists of RPM
e. Enable signals.
CONTROL transformer 1A1A1T1 (autotransformer), a dc
The above functions are described in paragraphs 5-3
power supply, dc motor 1A1A1A13B2, gear train
through 5-7.
1A1A1A13, and coarse and fine reading dials 1A1A1A7
and 1A1A1A8. The azimuth data circuit consists of
5-3. Group Case Power
FREQ SELECT switch 1A1A1S5, SYNC/R SLVR SEL
(fig. 6-1)
switch 1A1A1S6, ANT ROTATION switch 1A1A1S3, 4
The group case power circuit consists of 60-Hz circuit
breaker 1A1A1CB1, 400-Hz circuit breaker 1A1A1CB2,
resolver 1A1A1A13B1.
indicator lamp 1A1A1DS1 and GROUP CASE POWER
b. Antenna
Rotation.
When
POWER
SELECT switch 1A1A1S1. Circuit breakers 1A1A1CB1
FREQUENCY SELECT switch 1A1A1S4 is set to either
and 1A1A1CB2 provide either 60-Hz or 400-Hz
60 Hz or 400 Hz, primary ac power is coupled to RPM
primary ac power for operating the interface adapter unit
CONTROL transformer 1A1A1T1 and through the
and ultimately the IFF set. GROUP CASE POWER
contacts of energized relay 1A1A1K2 to AZIMUTH DATA
SELECT switch 1A1A1S1 is used to select either 60-Hz
SYNC / R SLVR SEL switch 1A1A1S5.
RPM
or 400-Hz primary ac power for use during IFF set
CONTROL transformer 1A1A1T1 output voltage is
maintenance, and for operating interface adapter unit
coupled to the primary of power supply transformer
1A1A1. Indicator lamp 1A1A1DS1 lights to indicate that
1A1A1T3. The voltage input to transformer 1A1A1T3 is
either 60-Hz or 400-Hz primary ac power has been
adjustable from 0 vac to 85 vac. The output from power
selected by the setting of GROUP CASE POWER
transformer 1A1A1T3 varies from 0 to 40 vac as RPM
SELECT switch 1A1A1S1
CONTROL transformer 1A1A1T1 is varied.
This
variation causes the de output of the power supply to
5-4. Power
vary from 0 vdc to 30 vdc. The result of the varying de
(fig. 6-1)
voltage is to drive de motor 1A1A1A13B2 at speeds that
The power circuit consists of FREQUENCY SELECT
will simulate radar antenna rotation from 0 rpm to 25
switch 1A1A1S4, 60-Hz circuit breaker 1A1A1CB3, 400-
rpm. Dc motor 1A1A1A13B2 drives COARSE AZIMUTH
Hz circuit breaker 1A1A1CB4, relay 1A1A1K1, and
dial 1A1A1A8 and FINE AZIMUTH dial 1A1A1A7 via
POWER indicator lamp 1A1A1DS3. Interface adapter
gear train 1A1A1A13. FINE AZIMUTH dial 1A1A1A7
unit primary power is supplied from the group case
rotates from 0 rpm to 900 rpm, and COARSE
power circuit through interlock switches 1A1A1S14 or
AZIMUTH dial 1A1A1A7 rotates from 0 rpm to 25 rpm.
1A1A1S15 to the 60-Hz or 400-Hz circuit breakers.
These
Change 1 5-1
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