CHAPTER 3
OPERATION
Note. This chapter locates, illustrates, and furnishes the operator sufficient information pertaining to the various
controls and Instruments provided for the proper operation of the equipment.
Section I. CONTROLS AND INSTRUMENTS
16. General
Control
Function
Haphazard operation or improper setting of the
controls can cause damage to electronic equipment.
MODULATION selector
Five-position switch. Posi-
tions are-
For this reason, it is important to know the function of
EXT, provides for use of
every control and meter on the equipment. The actual
external modulation.
operating instructions are contained in paragraphs 18
OFF, provides for unmodu-
through 22.
lated output signal.
1000~, internal modulation
at 1,000 cps.
17. Controls and Their Uses
1600~, internal modulation
The following chart lists the controls and
at 1,600 cps.
instruments of the signal generator (fig. 5) and indicates
20KC, internal modulation
at 20,000 cps.
what they do.
DEV MULT switch ---------- Three-position switch, X1-X5
X10. Selects three different
Control
Function
ranges of deviation. Multi-
plies reading on KILOCY-
POWER switch -------------- Controls the ac power input.
CLES DEVIATION meter.
Three positions, ON-OFF-
DEVIATION control --------- Varies degree of frequency
STANDBY. In STANDBY
deviation (fine adjustment).
position, only the filament
KILOCYCLES DEVI-
Indicates degree of frequency
circuit is energized.
ATION meter.
deviation. Dial face read-
FREQ. RANGE-MC
Selects the output signal fre-
ing is always subject to
selector.
quency range in three steps:
multiplying factor of DEV
50-100 mc, 100-200 mc, and
MULT switch. Use the
200-400 mc.
scale corresponding to the
TUNING control-------------- Vernier control for selecting
colored indicator lamp.
the output test signal fre-
OUTPUT meter -------------- Zero center galvanometer that
quency
indicates the calibrated out-
FREQ. IN MEGA-
Indicates signal generator out-
put reference level. This
CYCLES dial.
put frequency directly in
level is obtained by rotating
megacycles. Scale range in
the OUTPUT control until
use is indicated by the color
the OUTPUT meter is in
of the energized indicator
zero center (SET TO LINE)
lamp.
position. The movable in-
200-400MC TRIMMER
When using the signal genera-
dex of the OUTPUT control
control.
tor 200-400 me range, this
then is rotated to present a
trimmer peaks the final
dial reading of 100,000 mi-
doubler stage for maximum
crovolts. The OUTPUT
output.
control then indicates di-
OUTPUT control------------- Varies output signal strength
rectly in microvolts or dbm
from .1 to 100,000 micro-
across 50 ohms.
volts. The dial reading in-
Indicator lamps:
Indicate the output frequency
dicates microvolts and dbm
50-100, green
dial and deviation meter ranges
directly when the signal gen-
100-200, amber
being used by indicating the
erator is terminated in a
200-400, blue
position of the FREQ.
50-ohm load.
RANGE - MC. selector.
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