TFS124 Datasheet | Vectron International

Tfs124.doc version 1.5 01.02.2001 ______________________________________________________________________________________________________ VI TELEFILTER Filter Specification TFS 124 1/5 ______________________________________________________________________________________________________ Measurement condition Ambient temperature: 23 °C Input power level : 5 d Bm Terminating impedances for input: 1,2 k Ohm // -3,3 p F for output: 1,2 k Ohm // -3,3 p F External coil: 292 n H // 4 k Ohm Characteristics Remark: Reference level for the relative attenuation arel of the TFS 124 is the minimum of the pass band attenuation amin. The minimum of the pass band attenuation amin is defined as the insertion loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 3d B filter attenuation level relative to the insertion loss ae. The nominal frequency f N is fixed on 124,8 MHz without tolerance. The given values for the relative attenuation arel 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 TCf in the operating temperature range and due to a production tolerance for the centre frequency fc. Data ______________________________________________________________________________________________________ Insertion loss max 4 d B ae 2,7 d B (Reference level) ______________________________________________________________________________________________________ Centre frequency 124,79 MHz fc ______________________________________________________________________________________________________ Nominal frequency 124,8 MHz f N ______________________________________________________________________________________________________ 3 d B bandwidth 173 k Hz min 52 k Hz ______________________________________________________________________________________________________ Relative attenuation arel f N ... f N ± 26 k Hz 1 d B max 3 d B f N ±125 k Hz...