Section II
Paragraphs 2-1 to 2-2
SECTION II
OPERATION PROCEDURES
carrier output to the red line on the meter with the
2-1. OPERATING CONTROLS.
CARRIER SET control.
2-2. USES. The purpose of each operating control
e. MICROVOLTS. The microvolt dial is used to
on the front panel of Signal Generator SG-13/ARN is
adjust the r-f attenuator to the desired output. Its
as follows. See figure 2-1 for location of each control.
calibration is not correct until the CARRIER SET
control is adjusted for a red line indication on the
a. SET LINE T0 21V. This switch is the power on-
meter. It is calibrated from 4 to 200,000 microvolt.
off switch as well as a nine position step rheostat for
The unmarked lines on the dial represent even numbers.
adjusting the d-c input voltage. It is adjusted for a
For instance, the four unmarked lines between 1K
meter reading of 21 volts when the METER switch is
and 10K represent 2K, 4K, 6K and 8K microvolt
in the LINE position.
respectively. The significance of these settings is
discussed in Section III, paragraph 3-19.
b. CARRIER SET. This control is used to adjust
the r-f carrier output to the red line on the meter,
f. MEGACYCLES. This is a frequency selector
with the meter in CAR position The adjustment is
consisting of two concentric knobs, the outer knob for
made for each frequency chosen by the MEGACYCLES
selecting megacycle steps and the inner knob for tenth-
control.
megacycle steps, The frequency selected appears in
a vertical window the numbers of which represent, top
c. METER ZERO. The METER ZERO adjustment
to bottom, hundreds, tens, units, and tenths of mega-
is located behind the front access door. This control
cycles.
is adjusted for zero reading on the meter with the
CARRIER SET control turned off (maximum counter-
g. NAV-GS. The NAV-GS switch is used for select-
clockwise position), and the METER switch in the
ing 108.0 to 135. 9-mc signals or 329.3 to 335.0-mc
CAR position.
signals. It switches B+ leads and operates the coaxial
relay which connects r-f output to the univerter for
d. METER. This is a three position switch for
329.3 to 335.0-mc operation. It also changes the top
switching the meter for various functions. In the B+
number in the vertical window from 1 to 3 in changing
position the unregulated B+ voltage is indicated on the
from 100 to 300-mc operation,
meter. In the LINE position the input voltage to the
dynamotor and filament circuits is indicated on the
h. AUDIO SELECTOR.
The AUDIO SELECTOR
control is used to select the type of audio signal to
meter. The CAR position in addition to its use in ad-
modulate the r-f carrier.
justing METER ZERO, is used when adjusting the r-f
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