Cellular Combiner Amplifier wiring

The Cellular Combiner Amplifier is used to amplify the signals from (upload) and to (download) a cellular router when it is deployed in remote areas. Cellular towers (2G/3G/4G and soon 5G) are often found in cities, along highways and spread over the country side. Where less people are living clearly less cell towers are available. This results in a lot of areas in every country, often the country side or where farmers have their properties, where only a few cell towers are deployed.

The standard reach of a cell tower is about 10 km maximum and then the signal becomes soo bad that it is not usable for solid high speed data connectivity. When all the measures are applied mentioned at the previous page than the cellular combiner amplifier is your only option to improve the signal.

Below wiring diagram is the way to connect both your cellular router and the cellular antenna.

Cellular Combiner Amplifier wiring

A MultiWAN Cellular Combiner Amplifier (like the Passari Routers) has multiple cellular modems build inside the router enclosure. Since 4G MiMo technology is introduced in the cellular world meaning that each modem is equipped with 2 antenna connectors, MAIN and AUX. Every modem cable connector is a SMA female connector. This is standard for all brands (modems and routers) and everywhere around the globe.

The combiner amplifier is therefore also build with SMA female connectors at each side. Antenna signals are very low level voltage signals which require high quality low loss signal transport between the router/modems and the amplifier. It is imperative that therefore only low loss coax cable is being used. Keep in mind that 3dB signal loss or gain means actually a twice weaker or stronger signal.

The only thing to be carefull with in wiring the cables is that the MAIN of a modem is wired to the MAIN of a specific port of the combiner amplifier. Do the same with the AUX cable of that modem and than this is properly taken care of. Modem 1 to MAIN1 & AUX1. Modem 2 to MAIN2 and AUX2 and so forth.

Up to a maximum of 4 modems can be wired up to the combiner amplifier. This will not be enhanced to 5 or 6 modems. We have often received inquiries for more inputs but the optimum ratio between nr. of inputs vs. amplification is maxed at 4. More inputs will make the amplifier performing worse, that is not what we are aiming for.

If 5 modems are needed to be amplified than it is allowed to use a passive combiner at a chosen input port and combine to coax cables for that selected port. That works very well in daily practice.

At the output side of the combiner amplifier, since there are also SMA female connectors at the ‘non 19″ rack’ combiner amplfiiers, outdoor antennas are mostly equipped with N-connectors. Because outdoor antennas are often mounted many meters away from the source (the modem/router or the combiner amplifier) thick coax cable is used. For reason of better signal transport than thin coax cable but also because thick coax cable is much better weather resistant than thin coax cable. SMA connectors don’t fit on a thick coax cable. Thick coax cable requires N-connectors to be used. Therefore it is necessary to have a small cable in between the amplifier output connectors, called a ‘pigtail’ which has a SMA connector on one side and an N connector at the other side.

LTE antennas are actually 2 antennas in 1 housing. This is because of the MiMo technology. However nobody can prevent you from building your own discrete MiMo antenna by using 2 dipoles next to each other.