HELICAL FILTERS Specimen Specification 915MHz HELICAL FILTER Part: TT67218A-915M OUTLINES AND DIMENSIONS DESCRIPTION Helical filters offer a variety of benefits in comparison with SAW filters including customer specification of centre frequency and bandwidth, no initial design charges, lower insertion losses and lower impedance. In addition, the simpler design of helical filters enables smaller quantities to be produced economically and with quicker delivery. GENERAL SPECIFICATION Centre Frequency: Insertion Loss: -3dB Bandwidth: Sensitivity Fo -50MHz: Fo +50MHz: Fo -100MHz: Fo +100MHz: Return Loss: Ripple: Group Delay: Impedance: Temperature Conditions Operating: Storage: Poles: Case Style: Specified 915.0MHz ±4.0dB 25MHz 37dBc 27dBc 56dBc 46dBc -12db <1dB ns Typical ±0.5% ±2.6dB 27MHz 40dBc 30dBc 59dBc 49dBc -41.1dB 1dB ns In/Out: 50W 0° to +60°C -20° to +70°C 3 7H3 PERFORMANCE DATA CONNECTION SCHEMATIC PERFORMANCE DATA Marker 1 (MHz) 1: 2: 3: 4: 5: 6: 7: Meas 1: Mkr 1 Meas 2: Mkr 2 915.0000 901.8000 928.6667 865.0000 965.0000 815.0000 1015.000 dB -43.925 -7.075 -6.759 -0.003 -0.072 0.115 0.154 Marker 2 (MHz) 1: 915.0000 2: 901.8000 3: 928.6667 4: 865.0000 5: 965.0000 6: 815.0000 7: 1015.000 dB -2.602 -5.744 -5.512 -42.030 -32.567 -60.418 -51.160 915.000MHz -43.925dB 915.000MHz -2.602dB EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 1460 230000 Fax: +44 1460 230001 email: [email protected] web: www.euroquartz.co.uk