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Page Title:
Section III. B+ AND BIAS DISTRIBUTION |
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|  Section Ill. B+ AND BIAS DISTRIBUTION
the coil of squelch relay K801, con-
tacts 2-3 of K1, and contacts 6-16
of K802.
b. Transmit. On transmit, high-voltage
Receiver-Transmitter RT-323/VRC-24
relay K2 is energized, closing contacts 5
is supplied with +300 volts dc from Dyna-
and 6. Resistor R3 is shorted out and +300
motor DY-151/U through terminal F of
volts is supplied to the plates of tubes V804
jack J10. The +300-volt dc filter circuit
through V808. Contacts 3 and 4 of high-
is contained within the relay subunit. Re-
voltage relay close, and the modulated B+
ceiver-Transmitter RT-441/TRC-68 is
tapped off the primary of T802 (terminal
supplied with +300 volts dc by Power Sup-
2) is applied to the plate of transmitter
ply PP-1494/U through terminal N of rear
driver V105 and the screen grid of power
plug P1. The +300-volt dc filter circuit is
amplifier V106. Plate voltage is removed
contained within the power supply. These
from the broadband cathode follower V802A
are the only differences in the +300-volt
when contacts 6 and 16 of relay K802 open.
distribution circuits. The +300-volt dis-
tribution circuits on receive and on trans-
mit are described in a and b below.
a. Receive.
(1) Both +300-volt dc inputs are con-
Receiver-Transmitter RT-323/VRC-24
nected through +300-volt fuse F701
is supplied with +125 volts dc from Dyna-
to high-voltage relay K2. In Re-
motor DY-151/U through terminal K of
ceiver-Transmitter RT-441/TRC-
jack J10. The +125 volts is routed through
68, the +300-volt supply is applied
fuse F702 and the filter subunit and applie
t h r o u g h P1-N, FL13, J15-R,
to terminal P of J15 for distribution. Re
through plug P2, and returned to
ceiver-Transmitter RT-441/TRC-68 is
J15-U, J7-C, P701-C, to fuse F701.
supplied +125 volts from Power Supply PP-
Fuse F701 is a 30-ampere fuse in
1494/U through rear terminal P of plug
this set and is used only to com-
P1 and FL29. This voltage is already fil-
tered and is applied directly to terminal P
plete the circuit. The protective
fuse (F1806) is located in Power
of jack J15 when plug P2 is reversed.
Supply PP-1494/U (fig. 29). In Re-
a. Receive. On receive, the following
ceiver-Transmitter RT-323/VRC-
stages receive plate and/or screen volt-
24, the +300-volt input is applied
age from the +125-volt dc supply.
through J10-F, J7-C, P701-C to
(1) First and second rf amplifiers V102
fuse F701, a 1/2-ampere fuse.
and V103, and first receiver mixer
(2) On receive, relay K2 is deen-
V104.
(2) All stages of the uhf injection sys-
ergized, contacts 5 and 6 are open,
and the +300-volt input is dropped
tem subunit, V201 through V205.
to approximately +270 volts dc by
(3) First and second if. amplifiers
resistor R3. The +270 volts dc is
V301 and V302, second receiver
applied to the plates of broadband
mixer V303, and second oscillator
cathode follower V802A, second
V305.
receiver audio amplifier V804, and
(4) Third receiver mixer V401A and
receiver output amplifier tubes
third oscillator V401B.
V805, V806, V807, and V808. Mod-
(5) 500-kc amplifiers V501 through
ulated B+ is supplied to the plate
V504.
of power amplifier V106. Screen
(6) Audio preamplifier V803 and the
voltage to V106 is removed on re-
screen grids of receiver output
ceive. The 270 volts dc is also sup-
amplifier V805, V806, B807, and
plied to plate pin 6 of V801 through
V808.
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