Gsm combiner – fewer antennas, better signal
The GSM combiner allows you to reduce the number of antennas (aerials) connected to the device. By using a complete set of the combiner and YAGI antenna, you can solve the problem of a weak signal. With the help of the combiner and a directional antenna, you can forcibly select a base station for registering GSM modules by directing the antenna to it.
GSM gateways and other devices with a large number of GSM modules are usually also accompanied by a large number of antennas. Short antennas do not accept the signal so well, and long wired antennas often take up a lot of space and create a mess in the storage room. In addition, when placing the device in the zone of poor GSM signal reception, the question arises how to get a good signal on all channels of the GSM device. As a rule, for this you need to extend the antenna, however, when there are 10,20,30 and more antennas, each cable elongation and laying of cables between floors and walls turns into a serious construction task.
Latest Polygator GSM-devices already have a built-in GSM combiner. Thus, for every eight channels only one real antenna is required. However, you could use a Polygator combiner with any GSM-device, regardless of manufacturer.
GSM combiner operation
Polygator’s GSM combiner operates as a splitter and as a combiner for a radio signal. There are eight SMA connectors on the combiner for connecting the antenna outputs of a GSM-device you want channels combined. Small connecting cables (pigtails, 50 cm each) connect the antenna inputs / outputs of the device and the combiner. The main antenna connects to a separate SMA connector. The standard Polygator GSM combiner package comes with feeder (long cable) 10 meters long, and a directional antenna named YAGI. The antenna amplifies the signal and thus compensates for the partial extinction of the signal as it passes through the feeder and the combiner itself. (See the GSM combiner datasheet link)
If the quantity of antenna connectors on the GSM device is less than eight, then special plugs (terminators) to be applied to the GSM combiner free connectors.
Signal gain and less wires
Thanks to the combiner, it is possible with minimal effort to get the antenna out of a room with poor reception (like data center or server room) to the area of reliable reception. The feeder conducts the signal from the antenna itself to the combiner. The signal is distributed further over the connected antenna inputs of the GSM device. The cable type varies depending on the required feeder length to ensure minimum attenuation of the signal. By default, the standard Polygator GSM combiner package includes 10 meters of RG-48 cable as a feeder.
One of the alternatives to using GSM combiner is manual extension of the antenna wires. However, as a rule it is an inconvenient procedure with a poorly predictable result.
Does the GSM combiner worth using?
Of course. If your GSM device cannot be placed in a zone of reliable signal reception, then this is the only way to solve the problem of a weak / missing signal. In addition, dozens of small GSM antennas sticking out of GSM-gateways is the thing not every person likes. The ability to direct a YAGI antenna to a specific GSM base station is a necessary tool in certain situations and solutions.
GSM combiner allows not only to combine several antenna inputs into a single one, but also to solve the problem of a weak radio signal in some rooms. The GSM combiner helps to enhance the signal and create conditions for registering a GSM device at a specific base station.