Section I
Paragraphs 1-1 to 1-6
SECTION I
GENERAL DESCRIPTION
1-1. INTRODUCTION.
for ramp testing of aircraft navigation and localizer
receivers operating in the 108.0 to 135.9 megacycle
1-2. This handbook covers the description, operation
hand and glide slope receivers operating in the 329.3
procedures, theory of operation, maintenance, over-
to 335.0 megacycle band.
haul and adjustment of Signal Generator SG-13 /ARN.
See figure 1-1 for complete equipment. Signal Gener-
1-3. EQUIPMENT SUPPLIED.
ator SG-13/ARN is a portable test instrument designed
CASE 1
GOVERNMENT
NAME
TYPE DESIGNATION
QUANTITY
1
SG-13/ARN
Test Instrument Proper
AT-170/ARN
1
CX-1095U
1
Power Cord (10 ft)
CG-409A/U
1
R-F Cord (10 ft)
1
Adapter
UG-201/U
Adapter
UG-29/U
1
UG-529/U
1
2
3AG
Fuses (10 a, 25 v)
1
Bristol Wrench #10
Bristol Wrench #8
1
1
Bristol Wrench #6
1
Bristol Wrench #4
1
Phillips Screwdriver #2
1
Phillips Screwdriver #1
CASE 2
1
CY-868/11
Accessory Case
1
Power Cord (25 ft)
CX-1506/U
1
Power Cord (50 ft)
CX-1506/U
1
CG-409A/U
R-F Cord (25 ft)
1
CG-409A/U
R-F Cord (50 It)
1
Adapter
UG-29/U
4
Adapter
UG-201/U
1
Power Cord (1 ft)
CX-2489/U
1-4. EQUIPMENT REQUIRED BUT NOT SUPPLIED.
GOVERNMENT
QUANTITY
NAME
TYPE DESIGNATION
1-5. MECHANICAL DESCRIPTION. Signal Generator
A univerter mounts on the side of the r-f shield, and
SG-13/ARN consists of two cases, one of which con-
can be serviced easily by removing its cover.
tains the test instrument and all equipment necessary
for operation within 10 feet of the receiver and 10 feet
1-6. ELECTRICAL DESCRIPTION. Signal Generator
of the power source. The other case known as Ac-
SG -13 ARN may be tuned to any one of 280 channels
cessory Case CY-868 U contains 25 and 50 foot r-f
spaced at 100 kc intervals in the range 108.0 to 135.9
and power cables and additional adapters. The test
megacycles. A univerter provides output signals
instrument is mounted and operated in a cumbination
spaced at 100 kc intervals in the range 329.3 to 335.0
case having a waterproof snap-on cover. The test
megacycles for glide slope testing. A piston type at-
instrument is divided into two parts, the audio section
tenuator enables the r-f output to be varied from 4 to
and the r-f section, each having a separate chassis
200, 000 microvolts. The r-f signal is obtained by
but with a common front panel. The r-f section is
mixing and multiplying the outputs of two crystal
completely shielded, but the top, bottom, and rear
controlled oscillators. An audio selector switch is
used to select the type of modulating signal desired.
covers can be removed for access to the r-f chassis.
1
