Tait TB8100 Manuel D'installation Et D'utilisation page 98

Figure 4.12 Trajet des signaux UHF de la station de base - bande L (c.f. traduction des termes anglais des schémas suivants
SAW
Filter
RF RF
Switch Switch LPF LPF HPF
Input* Amp
SAW
Filter
Pad
70.1MHz
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
standby
DC Converter Board
RF Board Digital Board
SAW
Filter
Switch Switch
IF Receiver
SAW
front end
Filter
Normalisation,
Digital FM Demod, SINAD
Anti-
IF down
RSSI & SINAD processing
XTAL alias ADC
Amp converter measurement
filter filter
(DDC) RSSI,
processing
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
Control
I 2 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
Isolate
à la page 101)
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
RISC
Path B
RISC
Rx sub-band
CTCSS
encoders
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
generators
Direct modulation audio input
Digital Signal Processor (DSP)
Host port
SIO
Reduced instruction
Fan buffer set computer
(RISC)
I 2 C UART
Reciter
fan
*Frequency Bands & Sub-bands
L1 = 852-854MHz, and 928-930MHz
L2 = 896-902MHz (receive only)
L2 = 927-941MHz (transmit only)
**Depending on SIF type
SIF = system interface board
98
Path A (muted)
Path A (un-muted)
DAC
Path B (un-muted)
BO audio
Path B (muted) RISC
measurement
UO audio
RISC
measurement
RISC Line out test tone.
OTL RX
Test signal
Cross
RISC
RISC Pip tones
sink
Point
Switch
Interpolation Σ
(CPS)
DAC
filter
Interpolation
DAC
filter
Interpolation
filter
Line Repeater AC
loopback coupling filter
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 CWID
OTA
RISC PIP tones
RISC Test tone
General I/O
DAC
ADC
TX_KEY
RX_GATE
COAX Relay
System Control bus
Amp &
Switch
Control Panel
System
Control
bus
I 2 C port
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 panel
SIO to
RS-232 or
UART
Ethernet
RS-232 or
Ethernet converter**
Digital
inputs
Discrete Digital
Logic outputs
EPOTs
Mute Switches
SIF ID
Conventional TX_KEY
signalling RX_GATE
buffers COAX Relay
Speaker
Amp
Vol.
Knob
Mic.
Compressor Amp.
RS-232
converter
Service Kit
Speaker ON/OFF
Fan rotation
Control panel ID
LEDs
Keypad
Mic PTT
PA
fan
PMU
fan
Manuel d'installation et d'utilisation de la TB8100
© Tait Limited Février 2014