TM 11-5826-225-35
Figure 1-1.
D i r e c t i o n Finder Set
A N/ A R N- 8 3 ,
system block diagram.
positions depending on where range switch
functional block diagram in figure 52. This
S304 is positioned. Since switches S302 and
diagram shows the equipment signal paths and
S304 may each be set to three different posi-
methods of remote tuning, frequency range
tions, it requires nine positions of switch S1
selection, and operating mode (function) selec-
(three positions for each operating mode) to
tion from the control unit.
cover a l l frequency ranges and Operating
a. Operating Mode Control Signal Paths. The
modes.
receiver frequency ranges ( 190-400 kc, 400
850 kc, 8501750 kc) and operating modes ( adf,
Paths (fig, 5-2),
antenna, loop), are selected by motor B2 which
rotates frequency range and function switch
(1) Radio signals induced in Antenna AS-
1863 ARN83, are impressed on the
S1 through an Autopositioner circuit. Rotary
stator windings of resolver B3. The
switch S1, containing a number of sections,
direction finder set uses a resolver
combines both range and function selection into
operating as a goniometer rather than
one switch. Electrical circuits are completed
between motor B2 and switches S302 and S304.
using a rotating loop antenna. Rota-
ting the resolver rotor produces a ro-
For each of the three operating positions (adf,
tating figure-eight RF pattern the
antenna, or loop) of function switch S302,
same as rotating a loop antenna. The
switch S1 will rotate and stop on nine possible
1-2
Previous Page
