Cellular Amplifier Combiner

Cellular Routers come in many types, with a single 4G modem or with multiple 4G modems. This last type can be either doing Load Balancing or Bonding. The real challenge with cellular routers is actually to get them producing a good send signal that is strong (enough) at the cell tower of the operators. This will create the best possible throughput.

Cell towers are equipped with large antennas that provide a strong signal and reach quite far. A smartphone or a cellular modem is equipped with a small antenna and produces therefore a very weak signal over a long distance to that cell tower. In urban areas there are enough cell towers in the neighbourhood to connect at but at the countryside or even remote locations cell towers are quite far away. The produced signal level from a cellular modem is not reaching the cell tower or the signal is too bad to distill the data from it. This is the main reason when your phone or modem stops working due to ‘no signal’. The cell tower still can connect to the cellular modem but the modem cannot acknowledge this and than the connection is dropped. Mind it is always about a two way street alike traffic, going up and down to and from the celltower at the same time.

Than it becomes necessary to use better antennas and/or antenna locations to produce a better signal. But there are physical limits to these methods.

  • Place the MiMo antenna outside at the highest free line-of-sight position
  • Better antennas, longer dipoles or directional antennas, will -obviously- improve the overall performance.
  • Use the best possible coax cable, which has the lowest attenuation figures
  • Get to know on what frequency band most often a connection is established
  • Match this with the attentuation figures of your cable and the amplification figures of your selected antenna.

When all this is being done, you have done all you can to optimize your cellular signal conditions in a passive way (‘Passive’ meaning without the use of amplification electronics). And if this is still not sufficient than you can make use of our…

Cellular Amplifier Combiner.

Digital Deal can deliver 2 types of Cellular Combiner Amplifiers. Either the 5-band version or the new 6-band version. The 6-band version covers the 700 MHz band making it ready for upcoming 5G projects. The other bands are the same as with the 5-band version. This makes these combiner amplifiers capable of operating in 2G, 3G, 4G and even 5G mode!

The 5-band combiner amplifier is a device meant to be mounted against a wall, the 6-band amplifier is designed to be used into a -deep- 19″ rack.

5-band MiMo combiner amplifer wall mount.
800, 900, 1800, 2100 & 2600 MHz for 2G, 3G and 4G cellular WAN links with all SMA female connectors
front view with touch display inside the slider – 1U 19″ housing
rear view showing the 4 MiMo internal modem connections
and the 2 MiMo external antenna connection.
Also notice the Eth. connector for remote management
Notice the left & right sliders to support rear mounting in a 19″ rack

This is truly a piece of genius high frequency engineering!

The Cellular Amplifier Combiner allows for a maximum of 4 LTE MiMo modem connections to be combined in a 5- or 6-band LTE MiMo amplifier with just 1 MiMo LTE external antenna. Quite a mouth full of technical qualifications. Just imagine..

4 LTE MiMo connections equal 8 physical antenna connections. These are fed into an active combiner and then the output is directed to 5 independent selective frequencyband amplifier stages and from there fed into only 1 external antenna.

Just the reduction of all external cabling, only 2 external thick coax cables compared to 8 cables will become a significant cost reduction, often already justifying -cable & installation costs- the application of this amplifier-combiner. These high quality coax cables don’t come cheap. They need to be carefully installed, no sharp bending etc. The cables can become quite sturdy and thick which will significantly increase the installation costs. So only the cable reduction and fewer hours needed to do the proper installation equals the costs of this amplifier-combiner. And then we don’t even talk about the signal gains, that will be shown in the below chapter.

First, and foremost, this amplifier never exceeds the legal signal limits! As such a mobile operator cannot distinguish this amplifier from any passive setup. What it does, however, is making your external antenna appear as a virtually larger antenna, producing a better signal to the celltower, overcoming the inefficiencies of a smaller or passive antenna setup. The result is just phenomenal!

Cellular Load Balancing Routers or Bonding Routers all utilize multiple cellular modems internally. The reach with an optimized passive antenna setup is often a double of a traditional setup. With our amplifier-combiner this is even quadrupled and more! Over water, lakes or seas, we reach beyond the horizon. That is about 70 km away from the coastline and still capable of doing HD YouTube clips.

All amplifier devices we deliver are equipped with an AGC (Automatic Gain Control) to prevent the amplifier to produce too much send energy towards the cell tower. Mobile Operators are very allergic to this! There are many amplifiers out there in the market without this feature. Operators immediately notice the occurance of too much power produced to their cell towers. They ‘see’ which SIM card is causing this and just switch off that SIM card of producing data! When the SIM is known, also the owner is known. You can expect a visit of them…

Another important feature is the anti-oscillating circuit. If this is not present the amplifier can cause the operator its amplifier at the cell tower going wild! When that happens all connected devices to that cell tower will be disconnected. Mobile operators will take very drastic measures to the individual who causes this situation to happen! Therefore all amplifier equipment delivered by us is equipped with these important features securing your supperb operation of long distance cellular WAN links.

We, and our customers, have an extremely good experience with the quality and reliability of these products. Never one customer complained about the performance nor any product has been returned as defect! Truly a piece of genius high frequency engineering.

An explanation of the cabling and between router, amplifier and antenna is on the next page.