TM 11-6625-1668-12
CHAPTER 3
OPERATION
Section I. OPERATING CONTROLS AND INDICATORS
3-1. General
This section contains a description of the operating controls and indicators, their position and function. The
front panels of each major component are illustrated in figures 3-1, 3-2 and N The reference designations for
each control and indicator are provided on the rear of the frond panels.
3-2. Generator Front Panel Controls, Indicators, and Connectors
Control, Indicator, or Connector
Function
Sw Pos
Connection
POWER
(2-position toggle switch)
ON.................................
Connects 115-volt 60-hertz operating power to unit.
OFF...............................
Disconnects operating power.
POWER
(indicator lamp)
Lights when operating power is connected and POWER switch is ON.
SIGNAL
(indicator lamp)
Lights when output signal is marking.
Sw Pos
Connection
P-N
(2-position toggle switch)
P....................................
Connects output circuit for polar operation.
N....................................
Connects output circuit for neutral operation.
PERCENT DISTORTION
(Inner switch)
0-10-20-30-40 ...............
Selects the percentage of distortion introduced into the output signal in 10%
increments from zero to 40%.
(Outer switch)
0 through 9 ....................
Selects the percentage of distortion introduced into the output signal in 1%
increments from zero to 9%.
DISTORTION -SELECT
(6-position rotary switch)
NO DIST .......................
No distortion is introduced to the output signal.
BIAS M ..........................
Marking bias is introduced to the output signal.
BIAS S ..........................
Spacing bias is introduced to the output signal.
BIAS SW.......................
Switching bias distortion is introduced to the output signal at all code levels
in start-stop operation and 1:1 reversals.
END S/M .......................
Marking end distortion is introduced to the start-stop output signal only.
Sw Pos
Connection
END S/SS .....................
Spacing end distortion is introduced to the start-stop output signal only.
MESSAGE SELECT
(6-position rotary switch)
SELECTED CHARA-
Selects mark or space condition of intelligence bit elements 1 through 8 of
CTER BITS
selected character.
1:1 .................................
Sets generator output to 1:1 reversals.
MSG ..............................
Sets generator to transmit an 80- or 128-character fox message.
M ...................................
Sets output to steady mark.
S....................................
Sets output to steady apace.
EXT ...............................
Selects externally applied pseudo-random test message or data signal.
CODE LEVEL
(4 position rotary switch)
5, 6, 7, 8 ........................
Selects the number of intelligence bits in a character message.
3-1
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