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The Video Sender uses microwaves -
does this mean it could be dangerous? - could it fry my
brains? |
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Ah, this is a favourite!
No, don't worry - it won't
fry your brains. The power output of our standard
unit is only 10mW, which is less than the leakage from
your microwave oven which is also using the same
frequencies. It is also a fraction of the power of
your mobile phone. |
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This is really an
impossible question to give a definitive answer. It
will travel through light walls with some attenuation, but
depends how thick the walls are and what they are made of. |
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You must have a minimum
spacing of one clear channel, so the maximum number of
channels you can use is 3 (ie channels 1, 3 and 5, or
channels 1 and 5). For best results you should
always use the maximum spacing between channels.
Much more information is
given in another question on page 3 - have a
look
here |
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You may have tried other
manufacturers' video sending units or tried to adapt cheap
domestic senders and not been too impressed with the
performance. We have over ten years experience
building Video Senders and in that time we have acquired
the enviable reputation for producing the best units in
the industry. We have sold over 2500 systems to date
and we are always being told our units out-perform any
other system, regardless of price. Our ever
expanding range now includes a 16 channel/4 aerial Diversity
Receiver for the best performance yet!
When it comes to Video Senders, Black Box Video is best!
And the answer to that question is "Yes, they really do
work".
You might also like to look at this question on the
General FAQs page. |
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Our Diversity Video Sender
Receiver works very well, thank you!
Diversity Receivers have been used very successfully for
professional radio microphones for some time, but our use
in a microwave Video Sender is believed to be the first!
Our Diversity Receiver uses a four x aerial array
connected to the Receiver by a single SMA lead. The
Receiver can choose the aerial that is giving the best
reception at any point in time. Whilst still not
100% perfect this technique gives a substantial
improvement over single aerial systems.
Anyone who has used a non-diversity analogue Video Sender
will be aware that if the signal breaks up, only a very
small movement of the Receiver aerial is sufficient to
restore a good signal. This is because the
wavelength at microwave frequencies is only about 3 cms,
so moving the receive aerial this small amount will
position the aerial so that the unwanted reflections are
now eliminated. With four aerials to choose from,
all spaced about 1.5 wavelengths apart, it is almost
certain that one of them will be receiving a good signal.
The Diversity Receiver then quickly switches to the new
aerial and a good signal is restored. The aerials
used on the Diversity Box are all 3dB gain types which
further enhances range and signal quality.
Another clever feature is that all three elements - power,
RF and switching information - are all fed together down a
standard SMA lead with no need for three separate cables.
A standard non-diversity aerial can still be used with the
Diversity Receiver if required. |
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Our
standard screw-on Video Sender Aerials are
omni-directional - that is, they radiate and receive in
all directions. This is often necessary for the
Transmitter since it may be facing in any direction.
However, the Receiver Aerial can often be oriented towards
the Transmitter without a problem.
Making the Receiver Aerial directional can give some
advantages in the quality of reception. Firstly, our
Box Aerial gives 8dB of gain, which roughly doubles the
range. More importantly, being slightly directional
and picking up most of its signal from the front, it cuts
down on unwanted reflections from nearby objects that
cause signal break-up. The Box Aerial is the most
cost effective way of improving your Video Sender
reception. It is small, very lightweight and is
connected to the Receiver via a short SMA lead.
If the Transmitter is going to be facing in one direction
towards the Receiver you can use Box Aerials on both the
Transmitter and the Receiver to give a fantastic
improvement in performance for relatively small cost.
This will at least quadruple the range and be almost
break-up free. |
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We
originally supplied The Thrifty Package with the Roadstar Monitor
to keep the price down. Initially we were very impressed
with the original Roadstar and experienced no problems - the build
quality was excellent. However, after about a year, Roadstar
changed the design and the factory it was made in which resulted
in poor build quality and even worse reliability. Sadly, we
made the decision to discontinue supply The Thrifty Package with
the Roadstar, since their Monitor no longer matched the level of
quality we require. Fortunately though, the Data Video
Monitor had come down in price and the superb quality and 100%
reliability meant it was the most suitable Monitor for The Thrifty
Package.
With The Thrifty Monitor we supply our miniature Transmitter - The Stamp - as
standard, but you can upgrade this or any other part of
The Thrifty Package if you wish.
The KATA Bag and the Receiver are the same as in the
standard version - The Package - but the Remote Switch and the Box
Aerial have been dropped to keep the price low. |
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We hoped to
have a Digital Video Sender during Summer/Autumn 2006.
Unfortunately, due to unforeseen problems this didn't happen.
We were unable to get the price to an acceptable level, plus the
power, size and weight issues were not satisfactorily resolved.
We currently have no plans to
produce one in the near future, but if technology improves
sufficiently we may yet market one, just don't hold your breath
yet! |
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