BENDIX/KING
KX 165A
Rev 0, Jun/2000
15610M00.RCD
Page 4-9
4.2.2
TRANSMITTER
The transmitter produces an amplitude modulated (AM) signal within the COM BAND frequency
range of 118 to 137 MHz. The output power of the signal at the COM ANT is 10 watts minimum.
Refer to
for the following description of the transmitter.
The audio from the microphone is amplified and passed through a mic gain control which estab-
lishes the audio level used to modulate the transmitter. The mic audio signal is limited before it
passes through the response amplifier which drives the modulator/power control stage that ampli-
tude modulates the transmitter.
A buffered RF signal derived from the frequency synthesizer drives the transmitter chain. The
chain consists of the predriver, driver, final amplifier, LPF and Directional Coupler. The directional
coupler is used to sample the RF power. The sampled RF power is detected and buffered, then
routed to the modulator/power control stage to maintain the transmitter power output. The output
of the modulator/power control stage modulates the gate of the final amplifier and also drives a
low level modulator which modulates the predriver.
The T/R switch is embedded within the LPF. In transmit, the receiver is isolated by a PIN diode.
In receive, the PIN diode conducts the received signal to the RECEIVER BOARD.
Содержание Bendix/King KX 165A
Страница 1: ...MAINTENANCE MANUAL KX 165A NAV COMM TRANSCEIVER MANUAL NUMBER 006 15610 0000 REVISION 0 JUNE 2000 ...
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Страница 17: ...BENDIX KING KX 165A Rev 0 Jun 2000 15610M00 RCD Page 4 11 Figure 4 3 Transmitter Block Diagram ...
Страница 20: ...BENDIX KING KX 165A Rev 0 Jun 2000 15610M00 RCD Page 4 15 Figure 4 4 VOR Signal Generation ...
Страница 21: ...BENDIX KING KX 165A Page 4 16 15610M00 RCD Rev 0 Jun 2000 Figure 4 5 Localizer Signal Generation ...
Страница 23: ...BENDIX KING KX 165A Page 4 18 15610M00 RCD Rev 0 Jun 2000 Figure 4 6 Glideslope ...
Страница 26: ...BENDIX KING KX 165A Page 4 22 15610M00 RCD Rev 0 Jun 2000 Figure 4 8 CPU Block Diagram ...
Страница 28: ...BENDIX KING KX 165A Page 4 24 15610M00 RCD Rev 0 Jun 2000 Figure 4 9 Front Panel and Display Diagram ...
Страница 29: ...BENDIX KING KX 165A Rev 0 Jun 2000 15610M00 RCD Page 4 25 Figure 4 10 Power Supply Block Diagram ...
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