70 Functional Description TB8100 Installation and Operation Manual
© Tait Electronics Limited June 2005
Figure 4.12 TB8100 BSS UHF signal path - L band
RX
Cross
Point
Switch
(CPS)
Balanced
audio
input
Balanced
audio
output
Unbalanced
audio input
Unbalanced
audio output
Decimation
filter
Interpolation
filter
Decimation
filter
Interpolation
filter
Mic.
Test Signal
generator
PIP tones
FFSK
CWID
Selcall
Test tone
OTA
generators
FFSK
Tone remote
Selcall
OTL decoders
Unbalanced
Balanced
Line input level
measurements
HPF
HPF
Notch filter
Notch filter
Pre-emphasis
Pre-emphasis
Variable delay
Variable delay
Voice filter
Service Kit
Interpolating
filter
Hard limiterLimiter filter
Voice reject
filter
Interpolating
filter
DCS
encoder
CTCSS
encoder
TX sub-band signalling
TX path audio processing
Path A
Variable delay
Variable delay
Mute switch
Mute switch
De-emphasis
De-emphasis
HPF
HPF
CTCSS
decoder
DCS decoder
Voice reject
RX path audio processing
Rx sub-band
signalling
Interpolation
filter
BO audio
measurement
UO audio
measurement
Test signal
sink
Selcall decode
FFSK decode
Voting tones
FFSF
Pip tones
Line out test tone.
Tone remote
Frequency
control
loop
Decimating
filter
Loopback
Cross
Point
Switch
(CPS)
SINAD
processing
Normalisation,
FM Demod,
RSSI & SINAD
measurement
LPF
LPF
Switch
Frequency
control loop
quadrature
mixer +
buffers
Change over
switch
Ex SynthEx Loop filterEx VCO
LPF
RF
Amp
RF
Input*
Mixer Diplexer Buffer Pad
70.1MHz
XTAL
filter
IF
Amp
Anti-
alias
filter
Digital
down
converter
(DDC)
RSSI,
processing
RX SynthLoop filterRX VCO
Ref VCXO
(12.8MHz)
REF Synth
Ref detect.
Ext.
Ref.
40MHz VCXO
40MHz Synth
To RISC, DSP,
ADC, DDC
100mW
PIN
atten.
1W 6W 60W
Harmonic
filter
Directional
coupler
PA
Microprocessor
DAC
LPF
PA_KEY
DAC
AC converter
DC converter
10W
standby
AC
input
DC
input
PA1/PA2 output
40W
Converter
Aux. out (SIF) or
Trickle charger
µP
Standby
Isolate
Reciter output
Rear panel
ON/OFF
µP
µP
µP
Rear
panel
ON/OFF
µP
RF
output
Exciter to
PA RF
Reduced instruction
set computer
(RISC)
ADC
ADC
ADC
DAC
DAC
DAC
DAC
ADC
ADC
TX_KEY
RX_GATE
COAX Relay
I
2
C
I
2
CUART
LPF / Directional
Coupler Board
60W
Board
6W Board
Control Board
50W Power Amplifier
I
2
C current
sources
PMU
micro-
processor
I
2
C
Power factor
correction
Power Management
Unit
System
Control
bus
System
Control
bus
System Control bus
System
Control
bus
System
Interface Board
Digital BoardRF Board
Path B
Buffer
12.8MHz to
CODECs
Host port
RISC
RISC
RISC
RISC
RISC
Digital Signal Processor (DSP)
IF Receiver
front end
Decimating
filter
Reciter
Repeater AC
coupling filter
Line
loopback
Pad
L1 = 781.9-783.9MHz
L1 = 857.9-859.9MHz
L2 = 825.9-831.9MHz
low side
VCXO
Buffer
+ coax
driver
VCO
modulation
VCXO
modulation
12.8MHz
TCXO
TX
Cross
Point
Switch
(CPS)
Micro Card
AC Converter Board
DC Converter Board
ADCADC
DACDAC
Transient
wave shape
RF power
setting
Forward
power
Reverse
power
Bias
Bias
ADC
Power
control
RX_GATE
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
RISC
I
Q
SIO
OTL
encoders
DAC
ADC
Fan
buff.
Fan buffer
PA
fan
PMU
fan
Standby PS card
Auxiliary PS
PCB
RISC
RISC
RISC RISC
RISC
RISC
Buff
EPOT Buff
EPOT
Mute
Sw.
Mute
Sw.
Digital audio output
Buff
Buff
EPOT
EPOT
Digital audio input
Digital
inputs
Digital
outputs
RSSI
output
voltage
Power
from PMU
Power to
external
equipment
Buff
Third party
interface
connections
Discrete
Logic
Conventional
signalling
buffers
EPOTs
Mute Switches
SIF ID
Amp
Amp &
Switch
Vol.
Knob
Compressor Amp.
I
2
C port
expanders
Speaker ON/OFF
Fan rotation
Control panel ID
LEDs
Keypad
Mic PTT
Standard
Control Panel
2.5A
polyfuse
Buffer
10 or 12.8MHz
Buffer
General I/O
PA_KEY
DAC
Demodulated
audio
Direct demodulated audio output
Direct modulation audio input
Speaker
SIO to
UART
RS-232
converter
Rear
panel
RS-232
TX_KEY
COAX Relay
General I/O
Reciter
fan
Fan buffer
RS-232
converter
HPF
RF
Detect
AND
Path A
Path B
Path A (muted)
Path A (un-muted)
Path B (un-muted)
Path B (muted)
*Frequency Bands & Sub-bands
L1 = 852-854MHz, and 928-930MHz
L2 = 896-902MHz (receive only)
L2 = 927-941MHz (transmit only)
SAW
Filter
SAW
Filter
Switch LPF HPF Switch
SAW
Filter
SAW
Filter
Switch
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