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SELECTING AN ANTENNA (Antenna Installation)

Selecting an Antenna:-

All antennas are designed to receive select specific frequencies or channels. The radio waves passing across the elements induce a voltage that changes the value, synchronised with radiating current of the transmitter. This induced voltage, in association with the current that it produces, translates to energy that is in turn absorbed from the passing wave.

Since every wave that passes the receiving antenna induces its own voltage into the antenna element, it is necessary to fine-tune the length of the antenna element to a length that will optimise performance at the desired frequency.

Because we are trying to receive a range of signals with at single antenna, the elements along the length of the -


antenna will vary in length an the distance between each element will vary too. The distances between each element is a precise science and slight variances will dramatically impact on the over all performance of the antenna. For example birds can damage antennas by breaking or bending the elements which in turn will alter your recieved signal.

Remember "the quality of the signal received by the antenna CAN NOT ! be improved above theis level thoughout the distribution system".

The induced voltages are then combined through the phase bars of the antenna and fed through into the balum. The "balum" adapts the 300 ohm impedance of the antenna to the 75 ohm impedance of the co-axial cable. A poor quality balum or miss match with impedance will drastically reduce the efficiency of the antenna.


The perfect antenna will produce adequate "gain", will be well matched to the required frequencies and provide rejection of the reflected signals that are not directed into the front path of the antenna. The balum is constructed into the antenna and is purposely tuned for frequencies that the antenna was designed for.

Because the quality of the signal can not be improve above the recieved signal care must be taken to install the best possible antenna.

Things to consider when selecting an Antenna:-

1. Frequencies (channels) to be received,

2. Distance from the transmitters, the greater the distance the weaker the signals,

3 Power of the transmitter,

4. Black Spot transmitters are generally weak signals and only designed for local cover,



5. General terrain or in other words is there a Clean Line of Sight between antenna and transmitter is perferable. Mountains, office buildings, hills can cause loss and distortion of the signal. The ACMA (Australian Communications & Media Authority) can provide you with precise locations of the nearest transmitters. You can also down load this information from their website http://www.acma.gov.au

For example:- Locations - so you can work out the distance / Frequencies - is it VHF or UHF and the channels / Polarity / Black Spot Areas.




6. Finally the number of outlets you intend to install. The greater amount of TV outlets the greater the signal is required.


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This page was last modified on 29 November 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.


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