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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
My own construction, 23dB gain, motorized aerial
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<blockquote data-quote="hexah" data-source="post: 861138" data-attributes="member: 333852"><p>It is easier to buy a parabolic uhf antenne like this 120cm AN6111K from Engel Axil. </p><p></p><p>The principle is the same as a satellite dish except the signal is reflected back to a small log periodic. The feed line goes up the pole and in the back along the feed arm to a connection point where there is a small masthead amplifier built in. It is similar to the barrel types used for the active antenna concept developed by the DVB organization and only really used on the continent. </p><p></p><p>The f/b ratio iirc has been given at around 30dBi. </p><p></p><p>This is an old and well proven design. You can stack a pair or make a quad but anything more is unrealistic for most people due to the wind pressure.</p><p></p><p>They must be installed with free space behind as reflections e.g. from being installed on a wall will interfere with the wanted signal when amplified.</p><p></p><p>Probably the biggest mistake people could make would be to have too much amplification at the masthead because it will amplify local electrical noise and cause annoying dropouts or hide the weakest signals. The masthead amplifier provided is poor anyway and replacing it with a known good unit from e.g. Vision or Proception would be a great improvement. Antiference still makes grouped mastheads and they can be used to avoid strong out of group signals from interfering within the masthead or receiver (the barn door effect).</p></blockquote><p></p>
[QUOTE="hexah, post: 861138, member: 333852"] It is easier to buy a parabolic uhf antenne like this 120cm AN6111K from Engel Axil. The principle is the same as a satellite dish except the signal is reflected back to a small log periodic. The feed line goes up the pole and in the back along the feed arm to a connection point where there is a small masthead amplifier built in. It is similar to the barrel types used for the active antenna concept developed by the DVB organization and only really used on the continent. The f/b ratio iirc has been given at around 30dBi. This is an old and well proven design. You can stack a pair or make a quad but anything more is unrealistic for most people due to the wind pressure. They must be installed with free space behind as reflections e.g. from being installed on a wall will interfere with the wanted signal when amplified. Probably the biggest mistake people could make would be to have too much amplification at the masthead because it will amplify local electrical noise and cause annoying dropouts or hide the weakest signals. The masthead amplifier provided is poor anyway and replacing it with a known good unit from e.g. Vision or Proception would be a great improvement. Antiference still makes grouped mastheads and they can be used to avoid strong out of group signals from interfering within the masthead or receiver (the barn door effect). [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
My own construction, 23dB gain, motorized aerial
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