An antenna is an important part of any cell signal booster, as they are responsible for collecting signals from the outside regions and broadcasting the boosted signals. There will be two sets of antennas present in a cellular signal booster, including an outside antenna (for collecting signals from outside) and an internal antenna (for transmitting the amplified signals).
When installing the antennas of signal boosters, you have to be careful. There should be a minimum distance between these antennas for ensuring that the signals from your internal antenna are not reaching the external antenna. This will lead to a problem called oscillation that adversely affects the performance of the cell signal boosters. Therefore, you have to ensure that there should be enough antenna separation to solve this problem.
What Is MRSD?
Signal boosters have a Minimum Required Separation Distance (MRSD). This distance can vary based on the gain of each booster. When gain increases, you will have to separate the antennas further for avoiding oscillation. For a booster that has a gain of 50dB, it needs 40ft separation, whereas, for a booster with 60dB, there should be at least 75ft distance between the antennas.
When you measure the separation, make sure that you are measuring it as a straight line from the internal antenna to the external antenna. The distance must not be measured on the basis of the length of the cable used to connect the antennas with the amplifier.
How To Prevent Oscillation?
Oscillation is common in cell signal boosters. The majority of the boosters, now come with the ability to detect oscillation. When a signal booster senses oscillation, it will try to reduce the gain for preventing this problem. Nevertheless, if the problem persists, then it will shut itself off for preventing the damage. In this situation, you will have to separate your antennas further for preventing the signals from your internal antenna reaching the external antenna.
You may also introduce a vertical separation or a horizontal distance between these antennas. There should be at least 25-30ft vertical separation between the antennas for preventing oscillation. If vertical separation is not possible for you, then you can try a horizontal separation.
Remember that MRSD will be greater for horizontal separation than vertical separation. If you have a uni-directional antenna, then you should point it away from the building to avoid oscillation.
Antenna separation is an important factor that you must consider when installing the antennas of your cell signal boosters. There should be a minimum distance between them to avoid oscillation. You have to decide this distance based on the gain of your signal booster.