FIELD: electrical communication engineering.
SUBSTANCE: invention relates to mobile communication and can be used to compensate for the attenuation between the mobile communication device and the antenna. Circuit arrangement (1) for compensating for the attenuation that occurs in the antenna wire between mobile communication device (2) and antenna (3) with several subchannels (T1, T2, T3) for corresponding transmission in specific frequency bands. By means of first switch (S1) and second switch (S2), a subchannel is included that is included in the signal path between mobile communication device (2) and antenna (3). Circuit device (1) has pulse detecting unit (6) for detecting the impulse response of the high frequency signal of mobile communication device (2) to be connected to the circuit device, and is configured to select subchannel (T1, T2, T3) by controlling the first and second switches (S1, S2) of subchannel selection depending on the detected properties of the impulse signal.
EFFECT: technical result is an improvement in the recognition of transmission modes by determining the differences between GSM AND UMTS signals when both signals are modulated on one frequency.
11 cl, 2 dwg
