Quantcast Audio Stage Gain on Receive

 

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Figure 89. First if. amplifier subunit, tube socket voltage-resistance diagram.
Up
TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
Next
Sensitivity Checks


plifier, or the 3.0-3.9-mc if. subunits. Op-
100. Audio Stage Gain on Receive
erate Radio Set AN/VRC-24 or AN/TRC-
The voltage measurements listed in the
68 on normal receive. Check for proper
following chart will aid in locating a faulty
input voltages (para 100). Use Multimeter
stage or circuit component in the audio
ME-26/U to measure the voltages at the
amplifier and modulator subunit. Operate
test points listed. Voltages listed are for
Radio Set AN/VRC-24 or AN/TRC-68 on
frequencies in the range of 225.0 to 399.9
normal receive. Turn the SQUELCH con-
mc.
trol on the front panel to OFF. Use a vari-
able autotransformer and the ME-30/U to
obtain 115 (or 230) volts ac input to Radio
Voltage
(volts  dc)
Check
Test point
Set AN/TRC-68, or use a potentiometer
and Multimeter ME-26/U to obtain 26.4
-0.8 to -1.7
V201
and associated
cir-
volts dc input to Radio Set AN/VRC-24;
cuit
components.
+0. 38 to 0. 43 V202
and associated
cir-
then, connect the audio test box (para 128)
cuit
components.
and the ME-30/U to either front panel
+0.8 to 1.1
V203
and associated
cir-
AUDIO jack (fig. 38). Connect the volt-
cuit
components.
+1.1 to 2.1
V204
and associated
cir-
meter leads and a 600-ohm load across
cuit
components.
the SPEAKER and AF OUTPUT RETURN
t e r m i n a l s . (Connect oscilloscope AN/
N o t e . If reading is 1.1 volts
at J203 and J204, trouble is
USM-50 across these terminals to check
indicated in V204.
for spurious noise voltages.) Use Audio
-0.94 to -3.8 V205 and associated cir-
Oscillator TS-382/U and inject a 1,000-cps
cuit components, or
coaxial cable W4.
signal to the test points indicated in the
-2.0 to -2.6  V305 and associated cir-
following chart. Adjust the audio voltage
cuit components.
level of the audio oscillator to obtain a
-7.0 to -12.0 V401 and associated cir-
cuit components.
24.5-volt ac indication on the ME-30/U.
If the audio oscillator TS-382/U input re-
quired to obtain a 24.5 volt ac reading is
102. Transmitter Signal Tracing
greater than the input indicated in the fol-
lowing chart, ckeck the circuits and com-
Use the following chart to locate defec-
ponents indicated.
tive circuits or stages while the radio set
is operating on transmit. Before keying the
Audio  voltage
t r a n s m i t t e r , connect R a d i o F r e q u e n c y
Check
Test point
level
(volts
dc)
Wattmeter AN/URM-43A to the ANT. jack
0.93
Audio output cir-
J802 (fig. 76).
on the front panel. Before measuring volt-
cuits, including
ages at the test points indicated, check the
V804, T801, V805,
V806, V807, V808,
input voltage to the radio set (para 100).
and T802 (fig. 14).
Use Multimeter ME-26/U to measure volt-
Audio input circuits
0.042
BROADBAND jack
ages. Voltages listed in the chart are for
to V803 and asso-
J704-A (NOR BB
ciated circuit com-
the frequency range from 225.0 to 399.9
switch S801 in
ponents (fig. 20).
BB position) (TM
mc.
11-5820-222-10).
Audio input circuits
2.3
Voltage
to V804, includ-
Check
Test point
(volts dc)
ing S801 and K801.
V401 and third oscilla-
-6 to -12
tor circuit components.
101. Receiver Signal Tracing
V401 or buffer amplifier
3 to 3.8
circuit components.
Z403, Z402, and Z401
-0.3 to -0.98
The voltage measurements listed in the
-1.4 to -2.6  V305 or associated cir-
following chart will aid in locating a mal-
cuit components.
functioning stage or circuit component in
V304 or associated cir-
-1 to -1.5
the uhf injection subunit, the first if. am-
cuit components.


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