TM 11-6625-3041-12/TO 33A1-8-908-1
Section III
TECHNICAL PRINCIPLES OF OPERATION
1-15. OVERVIEW
Transmitter/ The SG-1139 consists of two functional sections, a transmitter
Receiver
and a receiver. The transmitter generates a test pattern that
is applied to the input of the path under test. The receiver
accepts the test pattern from the output of the path and de-
tects and counts any errors that may have occurred.
The transmitter and receiver each consist of two replaceable
circuit card assemblies (Transmit 1 and 2, Receive 1 and 2).
A power supply is also included and consists of two replaceable
circuit card assemblies (Multi VDC which provides +5, -5, +12,
and -12 dc voltages and AC Input which provides ac rectifica-
tion and fault summation).
