D-Cam brochure

The D-Cam Series
Wireless Radio Camera
for live ENG and Outside Broadcasts with
no multipath distortions
Wireless Cameras – A History
Gigawave have been pioneering the development of wireless camera
Gigawave MTV Transmitter in the camera docking unit and utilised an
systems for 15 years. The introduction of the analogue PITA system,
omni directional transmit antenna. A unique integral video encoder
with its sophisticated auto-tracking antenna system, made high quality
took Y,U,V inputs from the camera and processed them into a format
pictures from a wireless camera a reality.The PITA system was effective
which included no amplitude or phase components for transmission
in overcoming some of the multipath distortions by keeping the
across the link. The received signal was processed back into
antenna beamwidth to a minimum. However, the complex
conventional Y,U,V and composite analogue video.
electromechanical
made
both
construction
capital
and
maintenance cost prohibitive.
It was clear that rather than trying
“Real-time live digital transmission, with
high video quality is now possible with
D-Cam”
The G-Cam was so successful it
was selected as the only wireless
camera used at the Sydney
Olympics 2000. Multiple G-Cams
were used to bring viewers
to eliminate multipath it would be
better to process the signal so that multipath no longer caused picture
previously impossible live close-up shots from the spectacular opening
distortions. Multipath causes rapid amplitude and phase changes in the
ceremony and the many events which followed.
signal, which in turn has objectional effects, particularly on the colour
But technology moves on and the demands for digital transmission
subcarrier of conventional analogue video.
have led to the development of the D-Cam…..
Gigawave’s solution was the G-Cam, which incorporated a standard
The D-Cam, a new generation
... the best of both worlds!
MPEG 2 (4:2:2 )
‘Wavelets’
Fully scalable compression from 4
to 26 Mbps:
Unique Gigawave encoding
system:
Extremely robust RF
A video bit rate of 4 Mbps with QPSK
COFDM modulation provides an
extremely robust RF signal and improved
‘link budget’ for use in news gathering
and other difficult RF environments.
Less than 1ms* delay
Negligible delay combined with excellent
picture quality makes ‘Wavelets’ the ideal
compression system for television outside
broadcasts and studio production.
* Maximum 20ms allowing for normal camera
synchronisation.
Typical receive configuration
The Digital benefits
Previous generations of radio camera have been designed to either avoid reflected signals with directional antennas or minimise their effect by video
processing.With the introduction of Gigawave’s new COFDM multi-carrier modulation, the reflected signals actually provide a useful benefit.With parallel
data transmission, if a number of carriers are distorted or even destroyed by a frequency selective fade, they can be reconstructed in the demodulator
by correlation with the correctly recovered carriers.This means that even if no direct line of site transmission is possible the D-Cam is capable of providing
perfect pictures by rebuilding reflected signals. Operation inside buildings and around corners can now be accomplished with ease.
Gigawave have utilised their expertise in RF technology to completely re-design and linearise the RF stages of the link, to provide minimum power
consumption in the transmitter and maximum receiver efficiency. Operation at distances in excess of 10km are achievable with only 100mW output
power under correct operational procedures.
D-Cam is fully compatible with the latest generation MVL-D series and PTV-D series digital receivers and will typically work with an omni antenna
on the camera and a fan beam or more directional antenna on the receiver.
All functions of the transmitter, including modulation mode selection, encoding mode selection and frequency tuning, are selectable via the easy to
use control panel mounted on the side of the transmitter unit.This provides access for ‘on location’ parameter changes.
Standard BVV-5 camera interface
Fully modular ‘plug-in’ construction
The D-Cam camera docking unit
OCP Functions
Indicators
Power On
Data Transfer
Controls
Tally switch
Tally
Momentary button providing tally indication to
White balance
Bars
AWB
camera when pressed
ABB
Allows selection of the camera white balance
White Balance
memories
Menu
function
Bars
Gain LMH
Latching button switches between picture and colour
bars. lluminates when bars are selected
AWB
Manual white and
black balance
Auto
Momentary button selects camera’s automatic white
balance when pressed
ABB
Momentary button selects camera’s automatic black
balance when pressed
Gain LMH
Selects low, medium and high gain settings
Pedestal
Manual white and black balance
Joystick manual
Iris control
Provides override facility to the camera’s automatic
white and black balance settings
Auto
Latching button selects automatic or manual iris settings
Remote camera control
Joystick
Manual Iris control
As an option for G-Cam and D-Cam, a wireless camera control system
Pedestal
can be provided. This includes a standard format operators control panel
Pedestal inset ring on joystick providing pedestal black
(OCP) which will mount in the operators desk of an outside broadcast
level control
vehicle alongside conventional triax control systems.
Menu Functions including:
The Gigawave OCP can control up to 8 radio cameras and works with
Detail Level
CC Filters
a VHF or UHF data link to each camera. Most Betacam type broadcast
Detail on/off
Auto Knee on/off
cameras can be accommodated, including new digital Betacams.
Red Gamma Control
Shutter on/off
Camera type is selected via an internal rotary switch.
Green Gamma Control
Shutter Level
Blue Gamma Control
Iris Open
ND Filters
Iris Closed
19” Rack Camera Control Tx Unit
The D-Cam Series
Specifications MVL-D Receive System
Frequency Bands
1.3 - 15GHz
64QAM demodulation
16QAM demodulation
Receive Antenna
Types Available
QPSK demodulation
Tuning Range
3. 0.6m Parabolic Dish and
Antenna Feed Unit
Wider bandwidths available to
RF Channels
Triax Separation
Monitoring
(Rx Control)
Up to 12 pre-set channel plus
tuning in 1 MHz steps via
Reception Capability
Decoder
RF Head Unit Alarm
programmable to customer’s
Summary front panel alarm plus
requirement within available
comprehensive internal lock alarms
Power Supply
Universal supplies accept 95 to
Integral COFDM DVB-T
130V AC and 190-260V AC wide
Demodulator
ranging auto sensing plus 10 to
30V DC. Bias ensures no DC
COFDM DVB-T 2k carriers
consumption when AC is present.
Size
to match transmission modulation
Rx Threshold
Power on / modulation present
RF Received signal level meter
Automatic selection within receiver
Rx Noise Figure
Up to 600m
thumbwheel selection. Externally
receiver bandwidth
Demodulator
(directional)
2. Docking Fan Bean Antenna
300MHz standard bandwidth
special order
1. Docking Helix Antenna
RF Head Unit: 158 x 142 x 240 mm
IF Control Unit: 182 x 142 x 250mm
4dB nominal for 64QAM
Weight
-92dBm to BER 10-5 (QPSK)
RF Head Unit: 3.9Kg
IF Control Unit: 7.0Kg
Integral Digital Decoder.
Automatic digital decoding
Environmental
RF Head Unit:
Safe use: -30° to +60°C
Decoding
Video Output
Audio Outputs
4:2:0/4:2:2 DVB High Quality video
To spec.: -20° to 50°C
SDI 270Mbps and composite
Altitude: 4500m
video
Humidity: 100% long term
Quantity 2 Audio AES/EBU outputs.
IF Control Unit:
Safe use: -20° to +50°C
To spec.: -10° to +45°C
Altitude: 4500m
Humidity: 95% long term
For detailed specifications please refer to handbook or product specific data sheet.
The D-Cam Series
Specifications D-Cam Transmitter Unit
Frequency Bands
Video Input
1.3 - 15GHz 64QAM Modulation
6QAM Modulation
Composite Video
QPSK Modulation
Tuning Range
Audio inputs
300MHz standard bandwidth
Wider bandwidths available
Up to 16 pre-set channels or tuning in
Quantity 2 Audio inputs
mic / line level internally selectable
Transmit Output Power
to special order
RF Channels
SDI 270Mbps,Y, U,V or
100mW or higher, subject to
customer specific requirements
Transmit Antenna
Omni Directional 4dBi gain nom
1MHz steps via side mounted control
Transmission Capability
panel
Power Supply
11-16V DC 1.5 amps
COFDM DVB-T 2k carriers
Camera Types
Directly docks to any camera with
64 QAM, 16QAM, QPSK
BVV-5 interface, or battery
modulation selectable via side
mounting position optional
Size
mounted control panel with digital
display
Encoding
Weight
4:2:0/4:2:2 DVB High Quality video
Control Panel
Environmental
All settings and functions selectable
175 x 150 x 110mm
2.85Kgs
-20° - +50°C 100% humidity long
term
via side mounted control panel
with digital display
For detailed specifications please refer to handbook or product specific data sheet.
Gigawave Technical Centre, Earls Colne Business Park, Colchester, Essex CO6 2NS United Kingdom
Telephone: +44 (0) 1787 223300 Facsimile: +44 (0) 1787 222002
E.mail: sales@gigawave.co.uk Web:www.gigawave.co.uk
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