Tait TB8100 Instructions D'installation Et D'utilisation page 96

Figure 4.13 Trajet des signaux UHF de la station de base TB8100 - bande L (c.f. traduction des termes anglais des schémas suivants
SAW
Filter
RF RF
Switch Switch LPF LPF
Input* Amp
SAW
Filter
Pad
Mixer Diplexer Buffer Pad
Buffer RX VCO Loop filter
L1 = 781.9-783.9MHz
12.8MHz
L1 = 857.9-859.9MHz
TCXO
L2 = 825.9-831.9MHz
low side
Ext. 10 or 12.8MHz Ref VCXO
REF Synth
Ref. (12.8MHz)
RISC
Ref detect. RISC
Buffer Ex VCO Ex Loop filter Ex Synth
RISC
Σ
PA_KEY
Exciter to
PA RF
6W Board
PIN
HPF 100mW 1W
atten.
RF
LPF
Detect
Control Board
PA_KEY ADC
AND
50W Power Amplifier
Power Management
Unit
AC Power factor
AC converter
input correction
Rear panel
ON/OFF
AC Converter Board
µP
Rear
panel
Standby PS card
ON/OFF DC converter
DC
µP
input
DC Converter Board
RF Board Digital Board
SAW
Filter
HPF Switch Switch
IF Receiver
SAW
front end
Filter
Normalisation,
Digital FM Demod,
70.1MHz Anti-
IF down RSSI & SINAD
XTAL alias ADC
Amp converter measurement
filter filter
(DDC)
To RISC, DSP,
RX Synth
ADC, DDC
RISC
40MHz VCXO
40MHz Synth
Buffer
Change over
+ coax
switch RISC
driver
12.8MHz to
Buffer
CODECs
RISC I
Frequency
LPF ADC
control loop
quadrature
Q
VCXO mixer + LPF ADC
Frequency
buffers
control
VCXO
loop
modulation
Σ
DAC
VCO
modulation
DAC
General I/O
60W
LPF / Directional
Board
Coupler Board
Harmonic Directional RF
6W 60W
filter coupler output
Σ
ADC ADC
DAC DAC DAC DAC
System
Control
PA bus
Fan
Microprocessor
buff.
I 2 C
System
Micro Card
2 Control
I C current
sources bus
PMU
micro- I 2 C
processor
Auxiliary PS
Fan buffer
Board
µP
40W
Aux. out (SIF)
Converter
PA1/PA2 output
Reciter output
2.5A
polyfuse
µP
µP
10W
standby
Standby
Isolate
page 99)
Decimating
Direct demodulated audio output
filter
Path A
Demodulated
audio HPF De-emphasis Variable delay Mute switch
Decimating
Σ
RX path audio processing
filter
HPF De-emphasis Variable delay Mute switch
SINAD
RISC
processing
Path B
RSSI,
RISC
Rx sub-band
processing CTCSS
RISC
signalling
decoder
Σ Σ
Voice reject
DCS decoder RISC
Loopback
Cross
Point
Switch
(CPS)
RISC Balanced
CTCSS
RISC
encoder
Line input level
Interpolating
Σ
measurements
filter Voice reject DCS
RISC
filter encoder
RISC Unbalanced
TX sub-band signalling
TX path audio processing
Interpolating
Σ Variable delay Pre-emphasis
Limiter filter Hard limiter
filter
Variable delay Pre-emphasis
Direct modulation audio input
Digital Signal Processor (DSP)
Host port
Reduced instruction
Fan buffer set computer
(RISC)
I 2 C
Reciter
fan
*Frequency Bands & Sub-bands
L1 = 852-854MHz, and 928-930MHz
L2 = 896-902MHz (receive only)
L2 = 927-941MHz (transmit only)
SIF = system interface board
96
Selcall decode RISC
Path A (muted)
Path A (un-muted) FFSK decode RISC
DAC
Path B (un-muted)
BO audio
Path B (muted) RISC
measurement
UO audio
RISC
measurement
RISC Line out test tone.
RX
Test signal
Cross
RISC
RISC Tone remote
sink
Point
OTL
Switch
RISC Voting tones
encoders Interpolation Σ
(CPS)
DAC
filter
RISC FFSF
RISC Pip tones
Interpolation
DAC
filter
OTL decoders
Interpolation
RISC Selcall
filter
Tone remote
RISC
Line Repeater AC
loopback coupling filter
RISC FFSK
Decimation
ADC
filter
Voice filter
Decimation
ADC
filter
HPF Notch filter Path A
HPF Notch filter Path B
TX
Cross
Test Signal
Point
generator
Switch
(CPS)
RISC Selcall
RISC CWID
OTA
RISC PIP tones
generators
RISC FFSK
RISC Test tone
General I/O
SIO DAC
ADC
TX_KEY
RX_GATE
COAX Relay
UART
System Control bus
System
Control Panel
Control
bus
expanders
Description du fonctionnement
Reciter
RSSI
Buff output
voltage
Mute Unbalanced
EPOT Buff
Sw. audio output
Digital audio output
Balanced
Mute
EPOT Buff audio
Sw.
output
System
Interface Board
Balanced
EPOT Buff audio
input
Digital audio input
Unbalanced
EPOT Buff
audio input
Power
from PMU
Third party
interface
connections
Power to
external
equipment
Rear
SIO to
panel
UART
RS-232
RS-232
converter
Digital
inputs
Discrete Digital
Logic outputs
EPOTs
Mute Switches
SIF ID
Conventional TX_KEY
signalling RX_GATE
buffers COAX Relay
Amp &
Speaker
Amp
Switch
Vol.
Knob
Mic.
Compressor Amp.
Standard
RS-232
converter
Service Kit
Speaker ON/OFF
Fan rotation
2 Control panel ID
I C port
LEDs
Keypad
Mic PTT
PA
fan
PMU
fan
Instructions d'installation et d'utilisation de la TB8100
© Tait Electronics Limited Février 2007