Tait TP9100 - Page 36

36 Description TP9100 Service Manual
© Tait Electronics Limited May 2005
Figure 2.7 Transceiver operation in digital mode
Digital
Down-
converter
1st
IF
Channel
LPF
Second LO UHF: 90.328 MHz VHF: 42.928 MHz
FM
Demod
Quad
Demod
RX
AGC
Audio PA
Phase
locked to
TCXO
Mag.
PLL
Frequency
Control
Triple-point
Equalization
Drv
/Ex
Ramp
Control
TCXO:
13.000 MHz
VCO*
VCXO
Custom
Logic
Hardware
Hardware
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
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
External
Microphone
Speaker/
Microphone
Buffer
Accessory
Connector
External
Speaker
Accessory
Connector
RSSI
Voice
FEC
DSP
Voice
Packets
Rx
Signaling
FEC
Rx
Burst
Builder
Vocoder
Signaling
Packets
C4FM
Demod
Voice
Packets
Tx
Burst
Builder
C4FM
Modulator
Tx
Signaling
FEC
Signaling
Packets
Rx
Interface
Tx
Interface
Voice
FEC
Vocoder ALC
Arbitrator
RISC Processor
Front End
AGC
Front
End
LPF
Current
Sensing
PA
Bias
Antenna
Connector
Atte-
nuator
Pwr
Ctrl
Side
Tones