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Signal Booster System - Outside Donor Antennas | BoltonTechnical South Africa

Signal Booster System - Outside Donor Antennas | BoltonTechnical South Africa Today we talk about donor antennas , also called an outside antenna. The donor is the antenna that is installed on the outside of the building and it takes the cell signal from the tower and supplies it to the amplifier. The donor also takes the cell signal and sends it back to the cell tower. There are two types of donor antennas - Yagi directional and Omni directional. Understanding the differences between these two antennas will help you determine which antenna will be best suited for your installation. Yagi directional antenna transmit and receive a signal in a 110 degree horizontal pattern and a 65 degree vertical pattern. This is helpful for aiming or detuning the antennas. Yagi antennas provide a gain of 7-10dB on the different frequencies. You will need to aim a directional antenna at the signal source. This is a great feature which allows you zero in on a cell tower for the strongest connection available when you have weak signal. Yagi antennas will also receive a signal outside of the beam pattern, without applying any gain. This is a great feature which allows you to point the Yagi antenna away from the cell tower if the incoming signal is too strong. A Yagi directional antenna is ideal for cell phone signal stronger than -45dB and weaker than -76dB, you can also use a Yagi antenna to offset cable loss in long cable runs. An omni directional antenna transmits and receives signal in a 360 degree pattern, there is no ending of the antenna required since this type of antenna gathers signal from all sides. An omni antenna provides between 2-5dB gain depending on the frequency which is ideal for when the signal is greater than -75dB. A situation may arise where you have a weak signal from multiple mobile operators and the towers are located in opposite directions, in this situation you would want to install multiple donor antennas, one aimed at each of the towers, and requires that you install a splitter. Run a cable from each of the antennas to the splitter and a cable from the splitter the booster, there will be some loss for each cable and splitter, so calculate that into your system when determining how much signal can be used. Keep a minimum of 2 meters between each of the antennas on the roof when installing multiple donor antennas and make sure that the signal path does not cross.

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