TM 11-6625-847-45
Section IV. FUNCTIONAL OPERATION OF MECHANICAL ASSEMBLIES
reaching an open circuit, switch A1S1 will deenergize
1-25. General
relay A1Kl, removing the + 27-volt dc from motor A1B1.
The mc shaft coupler will then be at a position that is
representative of the frequency selected.
assemblies located on tray A1A1, tray A1A3, and tray
A1A5 of the SM-442A/ GRC.
1-27. Synthesizer Test Tray A1A3
1-26. Common Module Tray A1A1
a. Motor drive assembly A2 provides the
mechanical means of positioning the mc synthesizer
a. The operation of the mechanical module
module (on the RT-662/GRC) shaft coupler.
The
couplers on tray A1A1 are controlled by the RF AMPL
frequency coding information input to motor drive
100 KC SELECTOR knobs on the top panel of the tray.
assembly A2, for position the mc coupler, is received as
The rotation of the knobs is transferred to the
a ground on one of the 28 input lines as selected by the
appropriate coupler by sprocket gears on the shafts of
MC FREQ 10 MC and 1 MC frequency selector switches
the selector knob and coupler, connected by a loop
on the test set. The motor drive assembly is an open-
drive chain. An adjustable idler sprocket gear between
circuit seeking assembly that consists of switch A2S1,
two sprocket gears is used to adjust the slack from the
relay A2K1, motor A2B1, and associated gearing and
drive chain.
mechanical couplers.
Note. Where partial reference designators are
b. The gear drive assembly provides the
used, prefix with synthesizer test tray A1A3 reference
mechanical means of position the RF AMPL mc coupler
designator A1A3, unless otherwise specified
on the RF amplifier module of the RT-662/GRC when
connected to tray A1A1. The frequency coding
information input to drive assembly A1 for positioning
following discussion. Switch A2S1 is a 28 position
the mc coupler is received as a ground on one of the 28
rotary switch positioned by the shaft of motor A2B1. A
input lines as selected by the MC FREQ 10 MC and 1
ground on one of the contact terminals of switch A2S1
MC frequency selector switches on the test set. The
will energize relay A2K1 if the shaft of motor A2B1 is not
gear drive assembly is an open circuit seeking assembly
at a position that is representative of the frequency
that consists of switch A1S1, relay A1K1, motor A1B1,
selected on the test set. Relay A2K1, when energized,
and associated gearing and mechanical couplers.
supplies +27-volt dc to energize motor A2B1. Motor
A2B1 will then rotate and reposition the mc shaft coupler
Note. Where only partial reference designation are
and switch A2S1 until an open circuit is reached. Upon
used, prefix with comma module tray A1A1 reference
reaching a open circuit, switch A2S1 will deenergize
designator A1A1, unless otherwise specified.
relay A2K1, removing the +27-volt dc from motor A2B1.
The mc shaft coupler will then be at a position that is
representative of the frequency selected.
discussion. Switch A1S1 is a 28-position rotary switch
positioned by the shaft of motor A1B1. A ground on one
1-28. Driver, Discriminator, and Antenna Coupler
of the contact terminals of switch A1S1 will energize
Tray A1A5
relay A1K1 if the shaft of motor A1B1 is not at a position
that is representative of the frequency selected on the
test set. Relay A1K1, when energized, supplies +27-volt
The operation of turret assembly A1A1 is controlled by
dc to energize motor A1B1. motor A1B1 will then rotate
the DRIVER BAND SEL switch on the top panel of tray
and reposition the mc shaft coupler and connecting
A1A5. The BAND
switch A1S1 until an open circuit is reached. Upon
1-25
Previous Page
