FAQ - MCS + Filter, Combiners & Amplifiers

FAQ - Filter, Combiners & Amplifiers

When are DC-Stops deployed in an RF-Configuration?

Base Station Antennas must be DC-grounded. KATHREIN Base Station Antennas are DC grounded in accordance with EN 50083-1.

Masthead devices such as DTMA's are active devices and require DC power for operation. The DC voltage is generally provided by the BTS via the RF feeder cable to the mast top. Alternatively the DC supply voltage is inserted onto the RF feeder from an external Power Distribution Unit (PDU) via a Bias Tee.

In order to insure that a short circuit at the Base Station Antenna does not occur, it is imperative to design the RF-Configuration such that DC-Stops prevent the DC supply voltage reaching a Base Station Antenna.

KATHREIN provide either external DC-Stops as an accessory or as an integrated part of the combiner. Please see the individual data sheets of the respective multi-band combiner for details. KATHREIN generally offer a variety of versions with the DC-Stop functionality on different ports.

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