There is nothing more frustrating than sitting down to watch your favorite television show just to realise that the signal is down. If the screen is fuzzy, delayed or gone altogether, the antenna is probably the source of your frustration. In Adelaide, antenna installation and service specialists are unfortunately at the mercy of our four seasons in one day. Spontaneous wind gusts and surging rain patterns can easily disrupt signals emitting from your rooftop antenna.
In addition to these natural inferences, Australians are experiencing a digital transition phase. You may have heard about the campaigns involving the 2013 cut off from analogue to digital, and if not, then you might be experiencing some serious picture faults and disruptions. The upgrade to digital television means that television owners will either have to purchase a digital television or a new set top box with this capability. At this stage it is important to consult a technician. They will be able to advise you on what equipment you will need, what needs to go and what can stay. You don’t want to buy anything that isn’t suitable.
In addition to these natural inferences, Australians are experiencing a digital transition phase. You may have heard about the campaigns involving the 2013 cut off from analogue to digital, and if not, then you might be experiencing some serious picture faults and disruptions. The upgrade to digital television means that television owners will either have to purchase a digital television or a new set top box with this capability. At this stage it is important to consult a technician. They will be able to advise you on what equipment you will need, what needs to go and what can stay. You don’t want to buy anything that isn’t suitable.
When it comes to your antenna, however, if you own a television aerial or antenna that is on your roof and doesn’t qualify as a dodgy bunny-ear device, then you will most probably not have to worry about upgrading it. Not many people realise this but the only difference between an analogue and digital antenna is the mathematical encoding system used to modulate the RF carrier signal transmitted to your telly. The actual electromagnetic wave itself is analogue.
To describe a noticeable difference between the two systems, it is a characteristic of analogue TV that a weak signal will cause the picture to degrade or get progressively worse over time but is still usually watchable for a long time. The digital TV, however, needs a good constant signal, otherwise it tends to break up and become unwatchable very quickly. CSIRO’s Dr Stuart Hay explains. "Antennas made for analogue TV signals work just as well for both digital and high definition signals. It's incorrect to claim that you need a special antenna." Despite this, ABC Science outlines some of the key factors to a good working antenna. The shape and size of the antenna does make a difference to your reception. Depending on where you live, your antenna will be mounted either horizontally or vertically based on the signal's polarity, the axis in which the wave is vibrating.
To describe a noticeable difference between the two systems, it is a characteristic of analogue TV that a weak signal will cause the picture to degrade or get progressively worse over time but is still usually watchable for a long time. The digital TV, however, needs a good constant signal, otherwise it tends to break up and become unwatchable very quickly. CSIRO’s Dr Stuart Hay explains. "Antennas made for analogue TV signals work just as well for both digital and high definition signals. It's incorrect to claim that you need a special antenna." Despite this, ABC Science outlines some of the key factors to a good working antenna. The shape and size of the antenna does make a difference to your reception. Depending on where you live, your antenna will be mounted either horizontally or vertically based on the signal's polarity, the axis in which the wave is vibrating.
Types of Antennas include
Dipoles:
simple rabbit ear devices that receive signals evenly in all directions, known as called omnidirectional. LPDA: log-periodic dipole array antennas are used for VHF TV signals, consisting of several dipoles arranged in echelon to make a very wideband antenna. "Vee-shaped LPDAs have slightly higher gain for some channels while straight shaped LPDAs (where the elements are at 90 degrees to the boom or spine of the antenna) are good at cancelling out interference", says Hay. Reflector antennas: work by reflecting signals from a large conducting plane which acts like a mirror Paraboloid reflectors: are round wok shaped satellite dishes, small ones face north for pay TV while larger ones face northwest for satellites and programming purposes Yagi: the latest in antenna technology “Yagi's have several elements arranged in echelon and connected by a long boom,” says Hay for ABC Science. The longest element is called the reflector, next to which is the driven element. The remaining shorter elements are called directors and the more directors you add, the higher the gain.
Antenna installation in Adelaide is only a phone call away. Contact Antenna & Security on 0417 868 103 or visit their website http://advancedantennaandsecurity.com.au/ for a wealth of information and advice on home installation services.
simple rabbit ear devices that receive signals evenly in all directions, known as called omnidirectional. LPDA: log-periodic dipole array antennas are used for VHF TV signals, consisting of several dipoles arranged in echelon to make a very wideband antenna. "Vee-shaped LPDAs have slightly higher gain for some channels while straight shaped LPDAs (where the elements are at 90 degrees to the boom or spine of the antenna) are good at cancelling out interference", says Hay. Reflector antennas: work by reflecting signals from a large conducting plane which acts like a mirror Paraboloid reflectors: are round wok shaped satellite dishes, small ones face north for pay TV while larger ones face northwest for satellites and programming purposes Yagi: the latest in antenna technology “Yagi's have several elements arranged in echelon and connected by a long boom,” says Hay for ABC Science. The longest element is called the reflector, next to which is the driven element. The remaining shorter elements are called directors and the more directors you add, the higher the gain.
Antenna installation in Adelaide is only a phone call away. Contact Antenna & Security on 0417 868 103 or visit their website http://advancedantennaandsecurity.com.au/ for a wealth of information and advice on home installation services.
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