TM 11-6625-820-45
of GLIDE SLOPE connector J4. The complet-
226-35 for Radio Receiving Sets AN/ARN-82
ed path of meter M1 is through switch S1 to
and AN/ARN-82A. A schematic diagram of
pin V of J4.
the OBS indicator is shown in figure 1-3.
b. A resolver h a s t h e s a m e e l e c t r i c a l
c. Flag current from either the radio receiv-
There-
c h a r a c t e r i s t i c s as a transformer.
e r or the glide-slope receiver is read on
fore, a transformer can be used to simulate
FLAG meter M2. When switch S1 is in the
a resolver. When switch S2 is in the BRG
VOR/LOC (very high-frequency omni-direc-
position and RECEIVER MODEL switch S5
tional radio range/localizer) position, meter
M2 is connected through switch S1 to pin b
is in the B position, precision bearing trans-
formers T2 and T3 and their switching cir-
of P2 by the contacts of relay K2. The com-
cuits are used to produce the desired stator
pleted path from the meter is through the oth-
T h e 400-Hz reference signal
voltages.
er set of contacts of relay K2, through switch
from the radio receiver is applied through
S1 to pins c and a of P2. With the switch S1 in
switches S2, S5, and S3 to the primaries of
t h e GLIDE SLOPE position, meter M2 is
T h e s e primary
t r a n s f o r m e r s T2 and T3.
connected to pin v of J4 by switch S1 through
windings simulate the rotor of a resolver.
the contacts of relay K2. The completed path
of meter M2 is through the other contacts of
T h e combination of the precisely tapped
relay K2, through switch S1 to pin J on J4.
secondary windings of transformers T2 and
FLAG meter M2 can also be used to measure
T3 and the switching arrangement (S3) pro-
the output current of the RMI servoamplifier
duces the various voltage ratios that corre-
in the radio receiver. When the SERVO AMP
spond to the stator output of a standard re-
TEST switch S4 is pressed, 27.5 volts dc from
Each clockwise position of switch
solver.
tie point 18 of TB1 is routed to the RMI (radio
S3 simulates a clockwise rotation of a re-
magnetic indicator) servoamplifier of the radio
solver rotor i n precise 30 increments.
receiver and relay K2. When relay K2 is ener-
With switch S2 in the BRG position, the out-
gized, FLAG meter M2 is placed across RMI
put voltage path from transformers T2 and
servoamplifier load resistor R5. Resistor R4 is
T3 is through switches S5 and S2 to the radio
a current-limiting resistor and diode CR1 recti-
receiver on pins D, E, F, and G of connector
fies the RMI servoamplifier output current
P2.
that is applied to meter M2. Diode CR2 is
used to short out any voltage caused by the
1-5. Current Measuring Circuits
collapsing field of relay K2 when switch S4
is opened.
The outputs of four circuits in the radio re-
1-6. Compass Simulator Circuits
ceiver are measured in the test set. These meas-
uring circuits are described below.
The COMPASS SIMULATOR indicator con-
a. To-from current from the radio receiver is
tains a synchro transmitter of the same type
read on meter M3. TOFROM meter M3 indi-
used with the compass in an aircraft installat-
A s the dial is turned, the synchro
cates the direction and amplitude of the cur-
ion.
g e n e r a t e s a varying voltage from the 26
rent. Resistor R8 is a shunt resistor to extend
volts, 400 Hz that is applied to the COMPASS
the range of the meter.
SIMULATOR indicator. The output voltage
b. Deviation current from either the radio
f r o m the synchro transmitter is routed to
receiver or the glide-slope receiver is read on
the radio receiver and the RMI card to simu-
meter M1. With the switch S1 in the VOR/LOC
late a magnetic heading. The pointer simu-
position, pins P, B, and M of connector P2 con-
lates the pointer of the compass in the air-
nect through switch S1 to the DEVIATION
craft.
m e t e r . The return path from meter M1 is
1-7. RMI Circuits
through stitch S1 back to connector P2. When
The RMI card gives an indication of simulati
switch S1 is in the GLIDE SLOPE position,
ed magnetic heading. The simulated magnetic
meter M1 connects through switch S1 to pin T
C h a n g e 2 1-5
