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|  TM
11-5820-919-40-1
into the Xmt RF.
are connected in series.
During receive opera-
Each cell has
tion, the same circuits reverse the oper-
a nominal voltage of 1.86v.
The rated
ation, extracting the Rcv Audio from the
capacity for the battery pack is 4.8
Later versions of the
rf input signal.
ampere-hours.
battery pack may use different battery
2-28.
cells, such as nickel-cadmium or lithium
HARMONIC
FILTER.
The harmonic
filter removes spurious received signals
fluoride.
and suppresses transmitter harmonics
using six bandpass filters.
2-35.
POWER
DISTRIBUTION
SYSTEM
The Filter
Select signals from the control panel
determine the choice of filter. In
DESCRIPTION.
The +28v Battery
2-36.
transmit node, Xmt RF is routed from the
power amplifier through the filter and
(power input) from the battery pack is
to the antenna tuner.
routed through the amplifier/coupler to
In receive mode,
the rf flow is reversed.
the power amplifier module and a fuse
and to the control panel module, located
POWER SUPPLY,
The power supply
in the receiver/exciter unit.
2-29.
converts the +28v to 6.5v and 12.5v.
In the control panel, the +28v
2-37.
2-30.
Battery is routed through a fuse and
AMPLIFIER/COUPLER.
through the VOLUME switch where it is
2-31.
POWER
AMPLIFIER.
redesignated as +28v On.
The +28v On is
The Xmt RF from
power
the
modulator/demodulator
is
amplified
routed to the following modules:
amplifier (amplifier/coupler unit),
by the power amplifier during transmit
modulator/demodulator, synthesizer,
operation to provide 20 watts of power.
filter, and power supply.
harmonic
The power amplifier is bypassed during
receive operation.
The power supply converts the
2-38.
+28v On to +6.5v and +12.5v.
The +12.5v
2-32.
ANTENNA TUNER.
In transmit oper-
is routed to the control panel,
ation, the filtered Xmt RF from the
synthesizer, and
modulator/demodulator.
harmonic filter is routed through the
The +6.5v is routed to the synthesizer,
antenna tuner to the selected antenna.
modulator/demodulator,
power
amplifier
The antenna tuner automatically matches
The synthesizer
the antenna impedance to the radio set.
and antenna tuner.
filters out any ripple in the +6.5v by
In receive operation, the rf flow is
The +6v is
converting the +6.5v to +6v.
The antenna tuner is bypassed
reversed.
routed to the modulator/demodulator.
if the antenna select switch (ANT SEL)
is in the 50-OHM position.
The power amplifier supplies +16v
2-39.
Regulated to the relays of the antenna
BATTERY
PACK.
2-33.
This
tuner during the tune mode.
voltage will vary from +14
2v depending
The battery pack
DESCRIPTION.
on the ambient temperature.
consists of 16
silver-zinc cells which
2-8
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