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|  TM
11-5820-919-40-1
are connected in series.
Each cell has
into the Xmt RF.
During receive opera-
a nominal voltage of 1.86v.
The rated
tion, the same circuits reverse the oper-
at ion, extracting the Rcv Audio from the
capacity for the battery pack is 4.8
Later versions of the
ampere-hours.
rf input signal.
battery pack may use different battery
The harmonic
cells, such as nickel-cadmium or lithium
HARMONIC
FILTER.
fluoride.
filter removes spurious received signals
and suppresses transmitter harmonics
POWER
DISTRIBUTION
SYSTEM
The Filter
using six bandpass filters.
Select signals from the control panel
determine the choice of filter. In
DESCRIPTION.
The +28v Battery
transmit mode, Xmt RF is routed from the
power
amplifier through the filter and
(power input) from the battery pack is
In receive mode,
routed through the amplifier/coupler to
to the antenna tuner.
the power amplifier module and a fuse
the rf flow is reversed,
and to the control panel module, located
POWER SUPPLY.
in the receiver/exciter unit.
The power supply
converts the +28v to 6.5v and 12.5v.
In the control panel, the +28v
2-37.
Battery is routed through a fuse and
AMPLIFIER/COUPLER.
through the VOLUME switch where it is
The +28v On is
redesignated as +28v On.
The Xmt RF from
POWER AMPLIFIER.
power
routed to the following modules:
the modulator/demodulator is amplified
amplifier (amplifier/coupler unit),
by the power amplifier during transmit
modulator/demodulator,
synthesizer,
operation to provide 20 watts of power.
harmonic filter, and power supply.
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
In transmit oper-
ANTENNA TUNER.
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
and antenna tuner.
the antenna impedance to the radio set.
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.
This
tuner during the tune mode.
2-34 ,
voltage will vary from +14
2v depending
The battery pack
DESCRIPTION.
on the ambient temperature.
silver-zinc cells which
consists of 16
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