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TV Aerials
If UHF reception is good in your area, we would recommend a simple “10 Element Digital Aerial”, which are quite small and prove to be cost effective. Installed correctly they produce a crisp, clear picture, and usually blend in well to surrounding buildings etc. Also being of the digital type it leaves you the customer equipped for all modern viewing available through the varied set top boxes now available, it also leaves you prepared for the coming digital switchover.
However, if you are unfortunate enough to dwell in a poor reception area you will need a much more powerful aerial, commonly called a “High-Gain Aerial”. Although these are much bigger in general and are a little more expensive, they will maximize any weak signal available giving you an equally clear picture and overall quality to match the reception in dwellings better located. Some of these larger types of high gain aerial can also be used to receive from other more distant transmitters that offer different programming. Again, these would be digital type aerials.
Most viewing problems are simply a case of an inefficient aerial type or size, and even location. For example a loft mounted aerial can lose a large amount of it's gain capacity, particularly in modern housing which commonly has a foil insulation fitted. In fact, anything that obstructs an aerial will interfere with the received signal. The closer that object, the worse the problem.
Often in many cases, a repair, relocation or slight adjustment to the existing aerial is all that is needed to increase the quality of viewing. Co-axial cable like all things, erodes over time, especially around connectors on the aerial mast, and likewise, aerials can and do move slightly over time due to high winds and fatigue in the mountings.
Sometimes just a clean up and minor tweak will fix your problem, or maybe a replacement of the co-axial cabling will be the cure.
Other options to improve your viewing pleasure include such things as attenuators and amplifiers which we can advise you on accordingly. For example it’s not uncommon to find a signal can be over powerful, usually caused by living close to a main beacon, in turn you end up with co-channeling or ghosting. This is where an antenuator becomes useful.
When your reception is weak and causes such things as teletext drop out etc, an in line amplifier or booster will often resolve the situation. Such items are great companions for caravanning where signal reception changes with each location.
With the use of some additional equipment such as attenuators and amplifiers, any given single aerial can be routed to various points and thus be used efficiently with more than one TV set too.
Images 2 & 3 show the typical design for an average quality reception aerial.
Images 1 & 4 show the typical design for more powerful Hi-Gain type aerials.
Another type of aerial that is becoming very popular now is the WIDE BAND aerial.
These wide band aerials come in all shapes and sizes to suit location, but what are they ?
Basically the wide band types have been introduced to accommodate the full range of digital signals that are picked up through the set top boxes now commonly available. The reason for this is because Freeview Channels are transmitted over a very mixed range, thus it makes it difficult if not impossible, to receive all the channels through a standard group type aerial which is designed for just your area.
If you are fortunate enough to live reasonably close to a transmitter, a normal size wide band aerial is all you need, but for those with weak signal reception, a much stronger high gain is needed. This can sometimes present a problem, and the reason is simply because wide band means W I D E, and distance makes that focus broader than ever.
It is extremely important that a wide band aerial is installed correctly. Failure to do so will result in all kinds of interference from other transmitters and obstacles alike, due to the wide scope of reception.
The wide band aerial needs to be focused and optimised to the transmitter you require. Something best done with an alignment meter.
Here is a rough diagram showing the difference with a standard and wide band reception.
Just remember that poor quality weakened signals with digital reception, usually equals broken, blocky, frozen pictures
For more information and advice please feel free to Contact Us .
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