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Audio Output Circuits
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Figure 15. Audio output circuits, schematic diagram


audio circuits through contacts 10
(2) Speaker audio is applied to the front
and 19 of relay K802. On transmit,
panel AUDIO jacks through a vol-
headset audio for sidetone at a re-
ume control that consists of fixed
duced level is tapped off terminal
resistor
R5,
variable
resistor
8 of T802 through contacts 11 and 19
R714 (the front section of the VOL-
o f relay K802. Resistor R615 at-
UME control), and rf filter FL705.
tenuates the audio applied to the
Speaker audio is applied to Radio
AN/GRC-3 through -8 communica-
Set Control C-1439/U through fil-
tions equipment to a fixed level of
ter FL3 and terminal F of plug P1.
approximately 50 milliwatts (mw).
Interunit audio output connections
T h e fixed-level audio is applied
are shown for both Radio Set AN/
through rf filter FL26 and plug P1.
VRC-24 and AN/TRC-68. Radio
(2) Resistor R601 attenuates the head-
S e t Control C-1439/U audio cir-
set audio applied to the front panel
cuits are described in para-
AUDIO jacks. Front panel headset
graph 88.
audio level is controlled by fixed
b. Headset Audio.
r e s i s t o r R4 and variable resistor
R710 (ganged to R714). Front panel
(1) On receive, headset audio is tapped
headset audio is applied to termi-
off terminal 7 of the secondary of
nals A of J702 and J703, in parallel,
output transformer T802 and ap-
through rf filter FL701.
plied to the headset and fixed-level
28


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