A-510T(UHF)Ver1.0
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ANT SW
RF
LNA
ANT
AF
AMP
SP
TCXO
12.8MHz
MIC
RX
TX
AMP
PA
AMP
TX
SINGLE CHIP RDA1846
TRANSCEIVER FOR
WALKIE TALKIE
SCT3258TD
IP data port
AD/DA switch
Frame Encoding
Frame Decoding
Modulation
Frame
Demodulation
Header/Vaild
Date
TLV320AIC3204
Audio
Codec
Chart 1 Analog Circuit Structure
5.2
Receiving part
Front-end radio-frequency amplifier
The signal received by antenna comes into low pass filter and receiving/transmission switching diode (D5 and
D6 are disconnected), the unwanted signal is filtered out by L11.C60 band-pass filter, then comes into
radio-frequency amplifier Q6 for amplification; after the signal is amplified by Q6, then the unwanted signal is
filtered out by L15 and C57, and the useful signal comes into U9 (RFIN). (Refer to figure 2)
5.3
Transmission part
(
1
)
Radio frequency power amplifier
The radio frequency signal produced by U9 is amplified by pre-amplifier Q8, then the amplified signal is
amplified by driving amplifier Q4, after that, it is transmitted to final power amplifier Q3 to output 4.5W (when two
way radio is set on high power, the radio frequency power amplifier can output 4.5W radio frequency; When two way
radio is set on low power, the radio frequency power amplifier can output 1W radio frequency)
ANT
LPF
ANT SW
RF AMP
D5,D6
HSC277
Q6
AT32011
RDA1846S
5R
U9
LNA
RFIN
Chart 2 Receiving Circuit
L15
C57
L11
C60
Содержание A-510T
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Страница 14: ...A 510T UHF Ver1 0 14 53 4 5 Exploration Chart of Parts ...
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