Radiating Patterns of Donor Antennas

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The Donor Antenna (outside antenna) is crucial to obtaining the maximum signal and coverage for your repeater system. Typical antennas for our CS and SR series systems are the directional Yagi (6 element- 800MHz) and Grid (1900MHz). The DA series uses a Dual Band (800-1900MHz) Omni-Directional antenna. Notice in the diagrams below how the radiating pattern changes with the gain of the antenna. The higher the gain, the further the antenna can reach out to receive better signal. In most cases, the 6 element Yagi will do an excellent job of receiving the signal. In low signal areas, the 12 element Yagi may be needed to receive enough signal to supply to the repeater system. Please note that the Yagi antennas are for the 800MHz Cellular and 800MHz Nextel systems only. These Yagi antennas cannot receive 1900MHz signals (see Grid below).

The 1900MHz Grid antenna is standard on our CS and SR series repeater systems. The Grid antenna is extremely high gain and therefore has a highly-directional radiating pattern. The higher gain helps to increase signal for problematic 1900MHz frequencies.

Omni-directional antennas are the easiest to install since there is no "pointing" of the antenna. They receive and transmit in a 360 degree pattern. However, there are two drawbacks to omni-directional antennas. First, they have lower gain and hence diminished capability to reach out for a weaker signal. Second, by having a circular pattern they may interfere with the inside antenna if their signal overlaps. Minimum separation of omni-directional antennas (or isolation) is required. Another possibility is to separate the antennas with a signal blocking surface (such as metal, concrete, tile roof, etc.)

This is the Donor antenna used in the DA series repeater system.

Coverage Antennas and Interior Layouts

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