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Digital Transmission
Radio Frequency (RF) Stages
"Microwave
is a black art - ask any links engineer!"
Over the past twenty years, Gigawave has been responsible
for the design and manufacture of the PITA System and G-Cam, the world's
most successful wireless camera systems.
Gigawave is reaping the benefits of years of digital development work
and attention to detail, and nowhere is this more apparent than in all
the RF stages, with all new, state of the art digital products.
RF & IF amps; Up & Down
Converters
These must be linear to convey digital signals
without degradation, particularly when operating with the higher order
modulations like 64 QAM. Gigawave has developed a completely new range
of amplifiers and converters, all designed to work harmoniously together
in the most efficient way.
Power Amplifiers
Likewise, power amplifiers MUST be linear and
so Gigawave have designed a range of high performance linear power amplifiers
capable of operating with QPSK, 16 QAM, and 64 QAM.
Antennas
Antennas do not have to be redesigned to convey
digital signals, although the antenna requirements for the efficient transmission
of digital signals are quite different from those for analogue transmission.
It is therefore vital that antennas are designed to ensure the maximum
transfer of energy, individually optimised to the requirements of specific
digital transmission applications.
The D-Cam transmitter antenna is a unique Gigawave
design. It is circularly polarised 2.5GHz* antenna, optimised and matched
to the D-Cam power amplifier to achieve the most efficient transfer of
energy and to ensure the signals are transmitted in precisely the direction
required.
*Other frequencies are available.
Transmitters
Link budgets in the digital domain are considerably
better than the equivalent analogue link (typically +20dB) and so transmitter
power can be significantly reduced. This is a particular benefit for radio
cameras by reducing battery consumption, reduced heat dissipation, and
greatly improved safety margins.
Receivers
Gigawave LNAs have extremely low noise factor.
Digital channel filtering gives outstanding rejection to random and adjacent
channel interference. Overall Receiver performance and AGC dynamic range
are the best in the market.
A new generation of
digital microwave links...
...all offering outstanding RF performance!
Based on the wealth of operational experience gained over the past twenty years,
our engineers have designed and engineered a range of linear IF/RF stages,
up/down converters, and power amplifiers using 'state of the art' technology.
These components are a vital part of digital transmission
40Kms range from a 100mW transmitter!
Using only a 3dB CP Omni transmit antenna and 20dB Helix receive antenna, Gigawave
engineers achieved a range of 40.000 metres, under operational conditions,
in a recent test using a standard Gigawave D-Cam.
RF efficiency = operatior safety!
100mW output power is rapidly becoming the 'de facto' standard for wireless
cameras and other microwave transmitters where the antenna is close to the
operators head/body. The RF efficiency of the D-Cam wireless camera system
means that it will operate with an output power of only 100mW in all but
the most extreme OB environments, with only one receive site.
RF efficiency = low power consumption!
'State of the art' IF/RF stages, up/down converters, and power amplifiers and
optimised antenna design results in longer battery life and reduced weight, especially
important for wireless and on-board cameras.
Unique modular 'plug-in' design!
The unique modular design of all Gigawave digital microwave links means that
broadcasters can upgrade an encoder/decoder or modulator/de-modulator 'plug-in'
as and when new technology becomes available.
Encoding techniques, such as MPEG 2 and its derivatives, will only be around
until a better compression technique comes along. In due course, new modulation
techniques will evolve; but one thing is for certain - the laws of physics
will not change.
Whatever the future brings the new range of Gigawave digital links have been
designed to ensure that their customers can enjoy the latest technology, without
the need to purchase a complete new system.
If you are about to invest in new digital wireless camera system, make sure
that what you buy today will not be obsolete tomorrow!
A Guide to Digital Microwave Technology:
Digital Compression Techniques
Digital Modulation Techniques
Digital RF Transmission
A Glossary of Terms |
