Frequently asked questions

Technical Questions

Coiler’s AT, VB, ST, and MB Series repeaters are LTE-compatible.

Both the AT Series and PS Series repeaters are equipped with an extension port which allows to connect an additional service antenna to service a second room or area. The output power of the extension port is 10dB less than the output power of the main/built-in service antenna. For example, if the main antenna has an output power of +5dBm, the extension port will then have an output power of -5dBm.

Note: By default, all extension port connections are closed off by dummy loads to prevent unwanted power loss.

It is a set of RF standards designed and required by ETSI and 3GPP. The intended use of a repeater in a system is to amplify the in-band signals and not to amplify the out-of-band emission of the donor base station. It is the minimum required attenuation between the donor base station and the repeater for proper operation. It is also to prevent any interference with neighboring bands.

A network that uses Common BCCH will require a dual band repeater solution in order for both bands to be amplified. If the operator uses a single band repeater, only one particular frequency band will be amplified. As soon as the call is handed over to the other band which continues to have a weak signal, the call may drop.
The overall signal will be improved in a single band repeater scenario, but dropped calls will continue to exist until both bands are amplified.

Isolation: A unit of measure (in dB) that states the separation of signal levels on adjacent ports of a device. The greater the isolation value, the less interference from a signal on one port is present at the other.

In a general repeater installation case, a higher isolation requirement usually means more separation distance between the donor and service antennas is needed.

The donor antenna should be located in the strongest signal reception area and away from any barriers such as hills, high buildings or signboards. This location may be the rooftop or the side of the building, or inside the building in an area close to a window. You may use a mobile phone or spectrum analyzer to measure received signal strength and signal intensity (RSSI). A perfect location should have a signal strength greater than -70dBm. Ideally, the donor antenna should face the base station emitting the signal to be amplified. Depending on the application and the environment, the donor antenna used can be omnidirectional, panel or yagi.

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