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0453-2013

How to avoid interferences in UTMS networks produced by IF amplifiers?

Description: 

Since the release of the mobile 4G and LTE, in Televés we have emphasized the importance of shielding as the best solution against interferences.
The most common is talk about TV elements that are affected by interference from other bands.
However, the reverse also happens, as it is the noise generated by faulty installations of satellite IF reception systems in the 1.9 GHz band used in UMTS.
 

The main source of this interference is the IF amplifier, either by not having enough shielding or be working at the limit of its maximum output voltage..

The IF amplifier, ref532401, does not interfere the UTMS band. It is an amplifier in which the design has been carefully detailed to the point of be specified in its leaflet radiated emissions   

 

levels according to ITU-T K60.
Thus, for the UMTS band, this value is less than 47dBμV/m eventhough the limit is established in 74dBμV/m.
Because of its high output voltage (124dBμV as per DIN VDE 0855/12), the amplifier does not need approach its saturation to reach an optimum level in the TV outlet.
Both features make this amplifier ideal for distributing satellite IF signal by operators without affecting the users of mobile pones.

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