dsng system
TRANSCRIPT
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DSNG SYSTEM
DIGITAL SATTELLITE NEWS GATHERING SYSTEM
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WHAT IS DSNG?
• Satellite news gathering (SNG) is the use of mobile communications equipment for the purpose of worldwide news-casting. Mobile units are usually vans equipped with advanced, two-way audio and video transmitters and receivers, using dish dish antennasantennas that can be aimed at geostationary geostationary satellites.satellites.
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Cont….
• A modern DSNG van is a sophisticated affair, capable of deployment practically anywhere in the civilized world. Signals are beamed between a geostationary satellite and the van, and between the satellite and a control room run by a broadcast station or network.
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TYPES OF DSNG IN AIR NETWORK
• MOBILE DSNG SYSTEM Equipments are mounted
within a vehicle.
• FLYAWAY DSNG SYSTEM Equipments are mounted within carry away suitcases.
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LNBC
(1+1)
Audio
(Stereo)
from OB spot
DIGITAL RECEIVER
DIGITALENCODER
(1+1)
LEFTDIGITAL
MODULATOR
(1+1)RIGHT
UPCON-VERTER (1+1)
SSPA
100 W
(1+1)
1.2 M Dish
Antenna
LEFT
RIGHT
Analog
Audio
(Stereo)
LNBC
(1+1)
DIGITAL RECEIVER
LEFT
RIGHT
Analog
Audio
(Stereo)
UPLINKING SET UP RECEIVE/ HUB STATION
Power
Divider
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TYPICAL MOBILE DSNG SYSTEM LOOKS LIKE
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Lay out of Mobile DSNG System
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TYPICAL FLYAWAY DSNG SYSTEM LOOKS LIKE
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Lay out of Fly Away DSNG System
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COMPONENTS OF DSNG SYSTEM• MOBILE DSNG OUTDOOR UNIT : EASILY DEPLOYABLE
1.2M ANTENNA UNIT MOUNTED ON TOP OF THE VEHICLE ALONG WITH ACCESSORIES LIKE LNBC
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Cont…
• INDOOR UNITS : i. BASEBAND UNITS LIKE ENCODER,MODULATOR.ii. UPCOVERTERS,SSPAiii. UPS, PETROL GENERATOR.
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DESIGN CONSIDERATION
• Weight consideration.• Link Budget calculation.
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1. LINK BUDGET CALCULATIONS
1. Antenna Gain : G = Gain of Antenna
D = Diameter of Antenna 𝝀 = Wave length 𝜼 = Efficiency (usually 0.5 to 0.65)
The gain if the antenna under consideration = 37 dBi.
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LINK BUDGET CALCULATIONSCont….
2. Transmit Station EIRP: 10 Log (Pt x Gt)
Pt = Out put Power of SSPA/HPA in Watts. (Say : 10Watts = 10 dBw)
Gt = Gain of Antenna ( 37 dBi)
EIRP = 10 dBw + 37 dB = 47 dBw
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LINK BUDGET CALCULATIONSCont….
3. Flux density at Satellite Antenna Input := EIRP -162.2 (47 - 162.2 = 115.2 dBw/M2)
4. Path Loss : Lp = Path Lossd = Distance between uplink site & Satellite
(approx 36,000,000 meters) 𝝀 = Wave length
In our case it is about 200 dB at 6 GHz
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LINK BUDGET CALCULATIONSCont….
5. C/No (uplink) = EIRP + G/T(sat) + Lp – k= 47 + (-2) + (-200) – (- 228.6)= 73.6 dB-Hz
6. EIRP(downlink) = Sat. flux density(operating)
+ (Sat. EIRP Saturated – O/P Back-off)+ (S.F.D. - I/P Back-off)
= -115.2 + (38 – 4) - (- 85 – 6.5)
= 10.3 dBw
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LINK BUDGET CALCULATIONSCont….
7. Down Link Path Loss :
(In our case it is about 196 dB at 4 GHz)8. Receive G/T (6 m antenna) = 25.5 dB/°K9. C/No (downlink) = EIRP + G/T(CES) + Lp – k
= 10.3 + 25.5 – 196 + 228.6= 68.4 dB-Hz
10.Eb/No. = C/No – 10 Log (Data Rate) [256kbps]= 68.4 – 54.1 = 14.3 dB.
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120 WC - BAND
120 WC - BAND
UCU 60 C BAND
UCU 60 C BAND
MODEM DMD 20 RADYNE
MODEM DMD 20 RADYNE
ENCODER DAC 700 COMSTREAM
ENCODER DAC 700 COMSTREAM
DUMMY LOAD
LNA
MODEM, UPCONVERTOR & SSPA CHANGE OVER SWITCH
7812 7812
LNBC
LNBC
SPLITERSPLITER
ABR 202A
ABR 202A
ANTENNA CONTROLER GIGASAT STC 100
OFFSET ANTENNA DAUL FEED 1.2 mts. GIGASAT
UP CONVERTOR C-BAND GIGASAT SOLID STATE POWER AMP.
CODAN
MODEM SWITCH.
SPLITER SPLITERUP CONVERTOR SWITCH.
RF SWITCH
WA
VE
GU
IDE
CO
-AX
IAL
CA
BLE
DAUL LNBC UNIT
WA
VE
GU
IDE
WAVE GUIDE
CO
-AX
IAL
CA
BLE
CO
-AX
IAL
CA
BLE
- 22 dBm
CO
-AX
IAL
CA
BLE
CO-AXIAL CABLE
CO-AXIAL CABLE
LNBC SWITCH
- 15 dBm
CO-AXIAL CABLE
CO
-AX
IAL
CA
BLE
CO
-AX
IAL
CA
BLE
ISO MPEG I L-II
DATA CABLE
L
RIG
HT
LEF
T
R
SPECTRUM ANALYZER
ALA
RM
CA
BLE
ALA
RM
CA
BLE
ALA
RM
CA
BLE
ALA
RM
CA
BLE
ALA
RM
CA
BLE
ALA
RM
CA
BLE
+12 V CABLE +12 V CABLE
CO-AXIAL CABLE
CO-AXIAL CABLE
CO-AXIAL CABLE
CO-AXIAL CABLE
SP
LIT
ER
1:4
LEFT
RIGHT
LEFT
RIGHTAN
ALO
G A
UD
IO
AB
R #
2
A
BR
#1
BLOCK DAIGRAM DSNG
RF SWITCH CHANGE OVER SIGNAL
MOXA MOXA
LAB TOP
USB CABLE 2 USB CABLE 1
CO
M 1
3
CO
M 1
2
CO
M 1
1 C
OM
10
CO
M 9
CO
M 8
CO
M 7
C
OM
6
MAINTENANCE & COMMAND SETUP
PAD
PAD
R L
AES/EBU
AES/EBU
WA
VE
G
UID
E
ANTENNA PSU
DA-20 MOTORIZEDFLYAWAY ANTENNA PSU WITH EMERGENCY STOP GIGASAT
5. 8 - 6
.65 GHz
3.4
- 4.
2 G
Hz
( -
80 d
Bm
)
I/P AC 100-240V O/P AC 100-240V 15V DC O/P
LNBC REDUNDANCY CONTRLLER DC MONITOR
PCB LNA PSU
70 M
Hz
70 ±
18
MH
z
6.0
GH
z
40 dBm
- 40 dBm
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SUBSYTEMS OF DSNG
DSNG ANTENNA: Gigasat makeFeatures:– Carbon Fiber make antenna . Weight is less than 90Kg– High efficiency offset feed design providing maximum
gain – 37dBi– Antenna can be stowed.– STC-100 antenna controller enables antenna to acquire
and track satellites.– Manual and motorized operation of all the three antenna
motors.
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SUBSYTEMS OF DSNGCont…
Antenna Controller:• STC 100 is a comprehensive controller available in 1RU providing
all facilities including – Stow/Deploy– Jog Control– Auto positioning– GPS Receiver– Flux Gate Compass– Store/Recall Memory.
• Communication between STC-100 and Antenna is through an RS485 cross-site connection to the Local Antenna Control unit situated in the antenna cowl.
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Antenna Controller Interface diagram:
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SUBSYTEMS OF DSNGCont…
120W SSPA. CODAN Make Features:
– 120Watts SSPA– 5.85Mhz to 6.425Mhz frequency range– Third order intermodulation Products is better than
-25 dbc for 3dB Back-off.– 1+1 hot standby configuration.– 65dB gain – Innovative RF Power Combining technology, the latest GaAs
FET devices & Surface – mounted technology are used in this SSPA
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SUBSYTEMS OF DSNGCont…
C-Band Upconverter : Gigasat Make Features:
• IF to C-Band Upconverter• Output power : +9dBm (max.)• Gain adjustments : >40dB in 0.5dBsteps• Two stage Upconversion i) from 70MHZ to L-Band
ii) from L-Band to C-Band
• RF flatness across the band ±1dB max
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SUBSYTEMS OF DSNGCont…
IF Modulator: Radyne Comstream Make DMD20L
• Modem provides the operation of different parameters such as variable data rates, FEC code rate, modulation type, IF frequencies, interface type can be readily set & changed at the front panel.
• This allow the remote control from computer using RS232.• This modem contains a selectable RS232 or RS485 asynchronous
Com Port for Earth Station – to – Earth Station communications. The baud rate & protocol can be selected from the front panel.
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SUBSYTEMS OF DSNGCont…
IF Modulator: Radyne Comstream Make DMD20LFeatures:– IF Frequency Range 52MHZ to 88MHZ– Transmit Power: -5dBm to -25dBm– Supports Data Rates: 64kbps to 256 kbps– Supports QPSK and BPSK – FEC – Viterbi ½ – Supports monitoring and Controlling
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SUBSYTEMS OF DSNGCont…Encoder: Radyne Comstream DAC700
Features:• Digital Audio Codec• ISO MPEG I Layer-II Compression• Supports Data Rates: 64kbps to 256 kbps• Accepts Analog and Digital AES/EBU input• Supports monitoring and Controlling
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SUBSYTEMS OF DSNGCont…
Digital Satellite Receiver
Radyne Comstream ABR202A
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SUBSYTEMS OF DSNGCont…
REDUNDANCY CONTROLLER UNIT, RFS - 60• RFS – 60, Make GIGASAT is used to control 3 switches: One switch
for encoders / modulators, one switch for the up converters and one wave guide switch for the amplifier.
• The front of the controller has LEDs that display the status of each pair of equipment.
• In normal use the switches are set in automatic position.• For any failure the unit will automatically switch away from the
faulty peace of equipment. • If both chains of equipment are normal either chain can be
selected.
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SUBSYTEMS OF DSNGCont…
• 5KVA Petrol generator
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SUBSYTEMS OF DSNGCont…
Hydraulic Jack System
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THANK YOUTHANK YOU