Section II
Paragraphs 2-2 to 2-8
e. With METER switch in CAR position, and CARRI-
i. VOR. The VOR control enables the operator to
ER SET control fully counterclockwise, adjust METER
shift the 30 cps variable phase component of the VOR
ZERO control until the meter reads zero. This adjust-
signal in 45 steps around the azimuth. Eight omni-
ment is not critical. The meter may be off zero by
bearings from 0 through 315 are available for check-
several divisions with only a small error in r-f attenu-
ing omni-range receivers.
ator calibration.
j. 1 DEGREE. The 1 DEGREE switch is used to
f. Set NAV-GS switch to NAV position for 108.0 to
shift the omni-bearing indicated on the VOR switch
135.9 - mc operation or to GS position for 329.3 to
one degree in either direction. Sensitivity of omni-
range receivers to small changes in omni-bearing
335.0 - mc operation.
may be checked with this control.
g. Select frequency on MEGACYCLES selector
switch.
k. LOC-GS. The LOC-GS control is a potentiometer
used to vary the ratio of the 90 and 150 cps signals on
the TONE LOC and GLIDE SLOPE positions of the
h. To set up a specified signal strength, rotate
MICROVOLTS dial to desired output level and with the
AUDIO SELECTOR switch. On the
METER switch in the CAR position set meter to red
the AUDIO SELECTOR switch, it is used to vary the
percentage modulation of the 30 cps reversible phase
line with CARRIER SET control.
signal. Localizer and Glide Slope instrumentation
sensitivity is checked by the use of the LOC-GS control.
NOTE
FREQUENCY. The 30 cps oscillator is ad-
The meter must be reset to the red line with
the CARRIER SET control each time the
justed to exactly 30 cps with this control.
frequency is changed.
FREQUENCY. The 1000 cps oscillator
m.
Select desired modulating signal on AUDIO SE -
is adjusted to 1000 cps or any other frequency within
LECTOR control.
its limited range with this control.
2-5. CONNECTIONS.
n. AUDIO OUT. The AUDIO OUT connector provides
a demodulated output for test purposes.
2-6. Case I of Signal Generator SG-13/ARN contains
all the equipment necessary for operation of the instru-
o. OUTPUT, NAV-GS. The output for omni-range
ment at distances up to 10 feet from the power source
and localizer signals (108. O to 135.9 mc) is obtained
at the NAV output connector. Glide slope output (329.3
and the equipment under test. Accessory Case CY -
868/U contains 25 and 50 foot power and r-f cables
to 335.0 mc) is obtained at the GS output connector.
which permit operation at distances up to 85 feet from
Both terminals connect to R-F cord CG-409A/U.
the power source and the equipment under test. A
2-3. ADJUSTMENTS.
total distance of 170 feet between the power source and
equipment under test is therefore possible.
2-4. The procedure below outlines the adjustments
to be made prior to operation of the instrument.
ing of receivers exclusive of the antenna system is
a. Turn SET LINE TO 21V control to OFF position.
accomplished by making a direct connection from
of the receiver using R-F CORD CG-409 A/U together
with Adapter UG-201/U. Any combination of the
10, 25 or 50-foot lengths may be used by connecting
To avoid damaging the equipment, be certain
them in series using two Adapters UG-201/U connected
that the SET LINE TO 21V control is placed in
to one Adapter UG-29/U. See figures 2-5 and 2-6.
the OFF position before connecting the source
of power. Then, as the control is turned on ,
full dropping resistance is placed in series
with the input source and the equipment is
installation checks including the receiving antenna
protected from high input voltage.
system, antenna AT-170/ARN is attached to the proper
OUTPUT connector of Signal Generator SG-13/ARN
b. Connect either Power CORD CX -1095/U or
and then clamped securely to the edge of the case.
CX-1506/U to the 21VDC - 29VDC connector on
See figures 2-2 and 2-3. The antenna must be broad-
Signal Generator SG-13/ARN and to the 21-29 volt
side to the direction in which the signal is to be radi-
source of power.
ated. It must be connected to the NAV connector and
c. Turn METER switch to LINE position and adjust
extended to its full length for all signals in the 108.0
to 135.9 mc range. For glide slope operation, 329.3
SET LINE TO 21V switch until the meter reads 21
to 335.0 megacycles, it must be fully retracted and
0.5 volts.
connected to the GS connector of Signal Generator SG -
13/ARN . The MICROVOLTS dial should always be
d. Turn METER switch to B+ position and read B+
set to its maximum or 200 K setting when using AT-
voltage on the meter. Reading should be 230 volts.
170/ARN.
Allow 3 minutes warm-up.
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