As more and more people are using cell phones it has become imperative to have good cellular signal reception. Among the multiple solutions for this problem, using cellular signal booster seems to be the ideal option compared to others. You can use these devices at home, office, or even inside vehicles to get good reception in almost all situations. However, an issue inherent to this system is oscillation or feedback, and this is common in many electronic systems that have input and output units. The purpose of this article is to better understand the phenomena of oscillation in cell phone signal booster systems and how to avoid it.
What Is Oscillation Or Feedback?
Oscillation can occur in any electronic system that has a high chance of forming a positive loop between input and output systems. The familiar example is the microphone and the speaker system, the output of the speaker is picked up by the microphone and rebroadcasted resulting in the high pitched screech. Besides, this gets worse as the distance between them becomes closer.
Oscillation In Cellular Signal Booster
Oscillation also occurs in cellular repeater systems due to the positive loop because of the aforementioned underlying phenomena. This system consists of an outside antenna, an amplifier, and an internal antenna. The outside antenna picks up the cellular signal, sends it to the amplifier to boost it, and sends this amplified signal to the inside antenna for broadcasting. Feedback happens when the broadcasted signal is again picked up by the outside antenna and again passed through the system. Similar to the screech of the microphone speaker system, here the oscillation produces background noise. As a result, it fails the basic purpose of cellular signal boosters by a drop in call quality. Modern cell signal booster systems have inbuilt systems to avoid this, or they shut down on detecting feedback.
How To Eliminate Oscillation?
The best way to eliminate oscillation is to have a separation between inside and outside antennas of cellular signal booster systems. So, in those types installed in buildings, the distance of vertical separation is more important than horizontal separation. This is also determined by the type of outside antenna used, i.e. omnidirectional antennas require a larger separation than directional antennas. When it comes to those installed in vehicles, the metal roof will provide an adequate barrier to prevent this phenomenon. However, you should know that the distance between the antenna and amplifier affects the strength of the input signal, the more distance the greater the drop and vice versa.
So, when installing a cellular signal booster at home or office you must ensure to maintain a certain distance between the inside and outside antennas to get good signal reception.