TM 11-5820-333-30
2-3. RF SECTION
The rf section consists of four modules.
lF/Demodulator (A6)
Synthesizer (A8)
Tuner/Mixer (A7)
Amplifier-Oscillator (A9)
The lF/demodulator and tuner/mixer perform basic receive functions. The tuner/mixer filters and amplifies the
received rf signal and mixes it with the local oscillator signal from the synthesizer. The resulting rf signal is sent to
the lF/demodulator where the transmitted voice or data signal is recovered. The lF/demodulator detects cue
signals during FH operation. Receive operation is described in paragraph 2-8.
The amplifier-oscillator performs basic transmit functions and performs rf switching functions. It generates the rf
carrier. It frequency modulates the carrier with voice or data signal. It then amplifies the carrier to output level,
filters it to remove harmonics, and connects it to the communications antenna. The transmit/receive switch
connects the receiver to the communications antenna when not transmitting. The homing switch connects the
receiver to the homing antenna signal when in homing mode or to the transmit/receive switch when in communi-
cations mode. Transmit operation is described in paragraph 2-9.
The synthesizer provides the local oscillator signal for the receiver and the amplifier-oscillator injection (refer-
ence) signal for the transmitter.
2-4. FRONT PANEL
There are three types of front panel used:
RT Type
Front Panel Type
RT-1476/RT-1476A
Local Control Panel
RT-1477/RT-1477A
Dedicated Remote Panel
RT-1478/RT-1478A
MlL-STD-1553B Panel
The difference between the three rt types is the type of front panel used. The three front panels all talk to their rt
control module over identical serial data interfaces.
The local control panel has controls, a display, and the FILL connector. These are used to operate the rt. The
FILL connector is used when loading FH data. The local control panel also has drivers and receivers to interface
with an optional C-11466 or C-11466A control unit. Local control is discussed in paragraph 2-12.
The dedicated remote panel is the only one without a microprocessor. It receives control and display data, stores
them, and passes them on when commanded. It interfaces with a C-11466 or C-11466A control unit on one end
and the rt control module on the other. It will also interface with an optional second C-11466 or C-11466A control
unit. It houses the FILL connector used for loading FH data. Dedicated remote control is discussed in paragraph
2-13.
Like the dedicated remote panel, the MlL-STD-1553B panel receives and stores control and display data. In
addition, it reformats the data to meet the requirements of the MlL-STD-1553B bus controller and the rt control
module. The MlL–STD-1553B panel is capable of operating with a dual redundant bus system and uses the
transformer coupled stub bus interface method per MlL-STD-1553B. The MlL-STD-1553B panel houses a FILL
connector for loading FH data. An additional cockpit switch can be utilized so that FH data can be zeroized in
case of emergency to avoid a security compromise. This switch connects to the MlL–STD-1553B bus. MIL-
STD-1553B control operation is discussed in paragraph 2-14.
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