Tait TM8000 Series

52 General Description TM8100 Mobile Radio Service Manual
May 2004 © Tait Electronics Limited
Figure 2.14 Architecture of the TM8100 transceiver
IF:
UHF: 45.1 MHz
VHF: 21.4 MHz
Digital
down-
converter
Squelch
Front
end
1st
IF
Channel
LPF
Channel
LPF
RSSI
Second LO UHF: 90.328 MHz VHF: 42.928 MHz
FM
Demod
Quad
Demod
RX
AGC
Analogue-to-digital conversion
2nd IF:
64 kHz
Audio
filtering
De-
emphasis
Optional
processing
Data and signalling
decoders
Side
tones
Volume
control
Audio
PA
Phase
locked to
TCXO
LPF
ANT
Control
Head PWR
Mag.
PLL
Loop
filter
Loop
filter
Frequency
control
Triple-point
Equalisation
Audio
filtering
Pre-
emphasis
Optional
processing
Data and signalling
encoders
ALC
Mic
PGA
Mic
FGA
Dir.
Coup.
Fin
Drv
/Ex
Pwr
Crtl
Ramp
control
TCXO:
13.000 MHz
VCO*
Control
Auxiliary
Head
VCXO
Bias
CUSTOM-
LOGIC
BLOCK
HARDWARE
BLOCK
HARDWARE BLOCK
Digital-to-analogue conversion System interface
KEY NOTES (1) Noise blanker not shown (2) VHF configuration shown*
For UHF there are separate VCOs for RX and TX
DSP
BLOCK