Local Distributor Details

We have auto-selected a trusted Stelladoradus reseller in your country for you. You are buying from trusted reseller:

Coolfinn, Portlaw, CO. Waterford, Ireland

+353 51 387145

+353 51 387145

Advantages from buying from StellaDoradus: -Get advice and after sales support in your own language.StellaDoradus can advise you on the best booster for you.

Contact Us
Products

Mobile signal boosters – Installation tips to balance the signal from multiple operators

14 Oct 2017
omni vs yagi big building

When installing a DAS repeater system in a big building in a city, it is important to ensure that the signal is “balanced” from all the operators.

Firstly, take a signal measurement on the roof of the building. If you do not have a signal analyzer (image below) , instead, you can use 3 identical phones each with a different network sim in them. In our example we shall call the operators, A, B and C. (see Diagram above)

Used-Rohde-and-Schwarz-FSH18-18-ghz-Handheld-RF-Spectrum-Analyzers

It is typical for the signal of one operator to be stronger then the others. You can see in the diagram that operator C is much stronger then operator A. C is located only 50m from our building whereas A is 1000m. B is somewhere in the middle at 500m. These are big differences in distance and results in big differences in received power also.

In Diagram 1, an Omni-directional antenna receives the signal from all 3 operators and does not favor one operator over the other. The result is that unequal signal is sent to the first repeater in the system. The repeater does not differentiate between each of the operators. All it sees is the most powerful operator, in this case, operator C. If the signal level of operator C is above a the threshold level set in the repeater, the repeater will attenuate the power of operator C to a safe level. The repeater does this to ensure no overpowered signal enters the system.

The drawback to this is that, those weaker operators also get attenuated by the same amount and sometimes this means they are attenuated so much as to be useless.(See image 1, output of repeater)

You can see in diagram 1 that operator A has been wound down to zero. Operator B is wound down very low and only operator C is perfect. This is not a satisfactory result.

So how do we avoid this?

Take a look at diagram 2 above.

In this situation, we use a Yagi directional antenna instead of the omni used in diagram 1. A Yagi antenna can focus its power in one direction whilst reducing it elsewhere. By placing the Yagi strategically on the roof, in this case behind a big wall to block out the most powerful operator C and pointing it towards operator A, we can balance the 3 operators more effectively. Even though the signal being sent to the repeater is a bit overpowered, this is no problem, the repeater can attenuate it a little to reach the safe level. The main point is that the signal from each operator is roughly balanced. The repeater will then distribute this balanced signal through out the building.

 

 

You may also like:

    7th December 2017
    Result: Success! [symbol_explanation] [woocommerce_price id=”17″] Your mobile phone can see [bars] bars of  [network] in the location where you tested. A stelladoradus booster can amplify [network] into your building. Refine Selection [contact-form-7 id=”37805″ title=”Fieldtest Form Result Refine”] Suggested boosters by Coverage   1000m2 (up to 5 rooms) – homes , apartments StellaHome900 Frequency: 900Mhz (GSM+3G*). [...]
    read more

    OFCOM allows the use of repeaters in the UK (but only under conditions that make them impractical for general use)

    25th October 2017
    I am an engineer working for Stelladoradus and I am going to discuss the new ruling from OFCOM about repeaters in the UK.  Stelladoradus currently sells repeaters across mainland Europe, and we are displacing the sales of cheaper Chinese repeaters in these countries. These Chinese repeaters are a nightmare for the regulators like OFCOM because they create noise [...]
    read more

    6 choices to monitor all your devices for the Internet of Things. (IOT)

    17th October 2017
    PAM – Etherenet Ethernet WIFI EDGE SigFox, LORAWAN Vodafone NB-IOT
    read more