Section 7 diagrams, 1 radio frequency (rf) block diagram, Rx tx – Sony CMD-CD18 User Manual
Page 20
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SECTION 7
DIAGRAMS
7.1 Radio Frequency (RF) Block Diagram
Rx
Tx
The
GMSK
modulated
900
MHz
/
1800
MHz
signal
received
by
the
antenna
is
downconverted
into
the
baseband
via
an
intermediate
frequency
of
282
MHz.
In
the
transmit
direction
the
digitally
GMSK-modulated
baseband
signal
is modulated to the transmit frequency in the 900 MHz / 1800 MHz bands by means of a modulation loop and the
dual power VCO.
The
radio
part
mainly
consists
of
the
RF
Synthesizer,
Receiver
(RX),
Transmitter
(TX),
power
amplifiers,
diplexer/switch, antenna connector with integrated switch and antenna.
20
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