TFS141

      TFS141 is a kind of VT telefilter.Here you can get some information about the measurement condition.The ambient temperature (TA) is 23.The input power level is 0 dBm.The terminating impedances at fc is 1.07//-13.2 pF for input and is 1.10 k//-12.4 pF for output.
      What comes next is about the characteristics.The typical insertion loss (Reference level) (a_e) is 12.5 dB and the maximum is 15.0 dB.The maximum norminal frequency (f_N) is 141.7 MHz.The typical centre frequency (f_c) is 421.7 MHz.The typical 1.5 dB pass band is 2.6 MHz and the minimum is 2.2 MHz.The typical relative attenuation (a_rel) is 43 dB and the minimum is 40 dB at fN-410 MHz to fN-25 MHz.The typical arel is 1.0 dB and the maximum is 1.5 dB at f_N ±1.1 MHz.The typical arel is 47 dB and the minimum is 40 dB at fN ±2.0 MHz to fN ±10.0 MHz.The typical arel is 60 dB and the minimum is 35.0 dB at f_N ±10.0 MHz to f_N ±100 MHz.The typical VSWR is 13 dB.The operating temperature range is from 0 to + 70.The typical temperature coefficient of frequency (T_cf) is 0,036 ppm/ K².The typical frequency inversion temperature (T_o) is 25.The minimum input power level is 10 dBm.
      Here are some remarks about the TFS141.Reference level for the relative attenuation a_rel of the TFS141 is the minimum of the pass band attenuation amin. It is defined as the insertion loss a_e. The centre frequence fc is the arithmetic mean value of the upper and lower frequencies at the 1,5 dB filter attenuation level relative to the insertion loss ae. The nominal frequency f_N is fixed on 141,700 MHz without tolerance. The given values for the relative attenuation a_rel and for the group delay ripple have to be reached at the frequencies given below also if the centre frequency fc is shifted due to the temperature coefficient of frequency T_Cf in the operating temperature range and due to a production tolerance for the centre frequency f_c.