Volume 1 Section 2
15 December 1965
ITEM NAME: INDICATOR GROUP
E-W compensating voltages from Control
APA-81 so that the aircraft carrying it is shown at the
center of the display, as in a conventional PPI display.
Sweep Ranges: 80, 200 mi, 20, 50 and
IFF returns can be shown on either ground-positioned or
locally slewed displays. An electronic cursor provides
Power Source: 120v, 400 to 800 cps,
an alternate method of operation, by means of which the
range and hearing of either the predetermined ground
point or a target can be found.
Related Equipment: Used in conjunction with Radar
Set AN/APS-20A, AN/APS-20C. Equipment
Presentation: 7 in. CRT PPI, Ground
required, but not supplied: Interconnecting
Position Indication (GPI).
cables, Connector plugs and Adapters and
Signal Receiver: Radar and heading
marker IFF and beacon video signals
from Radar Set AN/APS-20A, N-S and
PRINCIPAL COMPONENTS AND PHYSICAL DATA
11-1/4 x 16-1/4 x 18
2-1/8 x 16-3/8 x 18-11/16
Power Supply PP-465/APA-81
7-5/16 x 11 x 17
2-1/8 x 11-1/8 x 18-7/16
Viewing Hood Assembly
REFERENCE DATA AND LITERATURE
AN16-20APA81-3 for Indicator Group AN/APA-81.