D-Cam Clip On Brochure

The D-Cam Clip-On
Wireless Radio Camera
for live ENG and Outside Broadcasts with
no multipath distortions
Wireless Cameras – A History
PITA:
which included no amplitude or phase components for transmission
Gigawave has been pioneering the development of wireless camera
across the link. The received signal was processed back into
systems for 15 years. The introduction of the analogue PITA system,
conventional Y,U,V and composite analogue video.
with its sophisticated auto-tracking antenna system, made high quality
pictures from a wireless camera a reality. The PITA system was
D-Cam Dockable
effective in overcoming some of the multipath distortions by keeping
However, technology moves on and the demands for digital
the antenna beamwidth to a minimum. However, the complex
transmission led to the development of the D-Cam. Introduced in
electromechanical construction made both capital and maintenance
2002, the D-Cam was initially manufactured as a dockable system, with
cost prohibitive.
full camera control facility, compatible with professional broadcast
G-Cam
It was clear that rather than trying to
eliminate multipath it would be
better to process the signal so that
This now allows simultaneous
broadcast and recording of live events,
ideal for news crews and single camera
broadcasts.….
camera
heads. The
quickly
became
the
D-Cam
digital
wireless camera system of choice
for the major outside broadcast
events throughout the world.
multipath no longer caused picture
distortions. Multipath causes rapid amplitude and phase changes in the
D-Cam Clip-On
signal, which in turn has objectionable effects, particularly on the colour
Having developed the technology, Gigawave have now produced the
subcarrier of conventional analogue video.
D-Cam Clip-On, utilising the encoding and RF design of the dockable
Gigawave’s solution was the G-Cam, which incorporated a standard
version. The D-Cam Clip-On is compatible with broadcast cameras
Gigawave MTV Transmitter in the camera docking unit and utilised an
and camcorders by interfacing with the camera’s battery clip.This now
omni directional transmit antenna. A unique integral video encoder
allows simultaneous broadcast and recording of live events, ideal for
took Y,U,V inputs from the camera and processed them into a format
news crews and single camera broadcasts.….
The D-Cam Clip-On Digital Wireless Camera System
•
•
Integral MPEG2 Encoder
Integral COFDM DVB-T Modulator
•
•
Composite, YUV, and SDI input
2 x Analogue / digital audio inputs
•
64QAM, 16QAM, QPSK operation
•
Side Mounted Control Panel for:
Modulation, Encoding Mode and
Frequency Selection
Previous generations of radio camera have been designed either to 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.The COFDM
modulation spreads the data over many carriers in such a way that 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 sight
transmission is possible the D-Cam Clip-On is capable of reconstructing perfect pictures by utilizing data from reflected signals. Operation inside buildings
and around corners can now be accomplished with ease.
Gigawave has 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 with correct operational procedures.
The D-Cam Clip-On 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 transmitter and a fan beam or more directional antenna on the receiver.
The D-Cam Clip-On mounts directly onto the camera / camcorder’s battery clip and provides its own battery clip on the rear of the transmitter.This
allows the user to power the transmitter and the camera / camcorder from a single battery.The D-Cam Clip-On supports a range of battery clip options.
Input to the D-Cam Clip-On is via an external Lemo connector and supports Composite,YUV and SDI inputs from the camera / camcorder.
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
Typical receive configuration
The D-Cam Clip-On Transmitter Unit
The D-Cam Series
Specifications D-Cam Clip-On Transmitter Unit
Frequency
Bands
Tuning Range
RF Channel
Transmission
Capability
1.3 - 15GHz
64QAM Modulation
16QAM Modulation
QPSK Modulation
300MHz standard bandwidth.
Wider bandwidths available to special order
Up to 16 pre-set channels or tuning in 1MHz
steps via side mounted control panel
COFDM DVB-T 2k
64QAM, 16QAM, QPSK modulation selectable
via side mounted control panel
Audio Inputs
Quantity 2 Audio inputs
mic / line level internally selectable
Transmit
Output Power
100mW or higher, subject to customer specific
requirements
Transmit
Antenna
Power Supply
11-16V DC 1.5 amps
Camera Types
Compatible with most broadcast cameras and
camcorders
Size
Encoding
Control Panel
Video Input
4:2:2/4:2:2 DVB High Quality video
Weight
All settings and functions selectable via side
mounted control panel with digital display
Omni Directional 4dBi gain nom
Environmental
SDI 270Mbps,Y,U,V or Composite video
160 x 130 x 54mm
1.0 Kg
-20º - +50ºC 100%
humidity long term
The D-Cam Series
Specifications MVL-D Receive System
Frequency
Bands
1.3 - 15GHz
64QAM demodulation
16QAM demodulation
QPSK demodulation
Tuning Range
300MHz standard bandwidth.
Wider bandwidths available to special order
RF Channels
Up to 12 pre-set channels plus tuning in 1 MHz
steps via thumbwheel selection. Externally
programmable to customer’s requirement
within available receiver bandwidth
Demodulation
COFDM DVB-T 2k carriers. Automatic
selection within receiver to match transmission
modulation
Rx Noise
Figure
4dB nominal for 64QAM
Power on / modulation present
RF Head Unit Alarm
Received signal level meter
Summary front panel alarms plus
comprehensive internal lock alarms
Power Supply
Universal supplies accept 95 to 130V AC and
190-260V AC wide ranging auto sensing plus
10 to 30V DC. Bias ensures no DC
consumption when AC is present.
Size
Weight
Environmental
-92dBm to BER 10-5 (QPSK)
Decoder
Integral Digital Decoder.
Automatic digital decoding
Decoding
4:2:0/4:2:2 DVB-T high quality video
Video Outputs
SDI 270Mbps and Composite video
Audio Outputs
Quantity 2 Audio AES/EBU outputs
Receive
Antenna Types
Available
1. Docking Helix Antenna (directional)
2. Docking Fan Beam Antenna
3. 0.6m Parabolic Dish and Antenna Feed Unit
Up to 600m
Monitoring
(Rx Control)
Integral COFDM DVB-T Demodulator
Reception
Capability
Rx Threshold
Triax
Separation
RF Head Unit: 158 x 142 x 240mm
IF Control Unit: 182 x 142 x 250mm
RF Head Unit: 3.9Kg
IF Control Unit: 7.0Kg
RF Head Unit:
Safe use: -30º to +60º
To spec: -20º to 50º
Altitude: 4500m
Humidity: 100% long term
IF Control Unit:
Safe use: -20º to +50º
To spec.: -10º to +45º
Altitude: 4500m
Humidity: 95% long term
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: [email protected]
www.gigawave.co.uk
www.dcam.tv
Websites:
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