TP9100 Service Manual Description 35
© Tait Electronics Limited May 2005
Figure 2.6 Transceiver operation in analog mode
Digital
Down-
converter
Squelch
Front
End
1st
IF
Channel
LPF
RSSI
Second LO
UHF: 90.328 MHz
VHF: 42.928 MHz
FM
Demod
Quad
Demod
RX
AGC
Audio
Filtering
De-
emphasis
Optional
Processing
Data and Signaling
Decoders
Side
Tones
Audio
PA
Phase
locked to
TCXO
LPF
Mag.
PLL
Frequency
Control
Triple-point
Equalization
Audio
Filtering
Pre-
emphasis
Optional
Processing
Data and Signaling
Encoders
ALC
Current
Sensing
PA
Drv
/Ex
Pwr
Ctrl
Ramp
Control
TCXO:
13.000 MHz
VCO*
VCXO
Bias
Custom
Logic
Hardware
Hardware
DSP
Mic
FGA
Loop
Filter
Volume
Control
Mic
PGA
Channel
LPF
Loop
Filter
IF:
UHF: 45.1 MHz
VHF: 21.4 MHz
2nd IF:
64 kHz
Rx
Interface
RISC Processor
RISC Processor
Analog-to-digital conversion
Digital-to-analog conversion
System interface
Key Notes
(1)
(2)
VHF configuration shown*
For UHF there are separate VCOs for Rx and Tx
Tx
Interface
External
Microphone
Speaker/
Microphone
Buffer
Accessory
Connector
External
Speaker
Antenna
Connector
Accessory
Connector
Front End
AGC
Atte-
nuator
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