Modem Coupling and Voiceband Transformers Low Distortion Schematic "C" Frequency Range: 300Hz to 3500Hz Isolation is 1500VRMS Min. PRI Designed to meet FCC part 68 Low Profile Package 1A Custom Designs Available 2A Schematic "D" SEC 3A 5A 4A 6A 1B 5B 2B 6B 1A 5A 2A 6A 1B 5B 2B 6B 3B 4B Electrical Specifications at 25OC Parameter T-31107 T-31108 Units 600 365 600 470 Ω Ω 1:1 1:1 maximum 80 80 mA PRI. + 10% SEC. + 10% 95 180 95 180 Ω Ω Insertion Loss max., ref. 1 kHz 2.0 2.1 dB Return Loss min., @ 300 Hz 15 26 dB Longitudinal Balance min., 200Hz to 4kHz 60 60 dB Frequency Response 300 Hz to 3.5 kHz + 0.25 + 0.25 dB minimum 1500 1500 VRMS C D Impedance R Load PRI. SEC. Turns Ratio Direct Current in Pri. (DCI) DC Resistance Isolation Schematic Style .525 (13.34) TYP. 1.65 (40.64) 2 4 1.20 (30.48) 1 6 5 5 6 3 Split-Bobbin Style Package 3 Coil B Coil A 4 2 1 .250 (5.72) .200 (5.08) TYP 1.025 (26.04) Specifications subject to change without notice. Rhombus Industries Inc. .250" x 2 Equal Spacing .200" X 8 Equal Spacing For other values & Custom Designs, contact factory. 7 COUPLNG3 - 11/98 15801 Chemical Lane, Huntington Beach, CA 92649-1595 Tel: (714) 898-0960 • Fax: (714) 896-0971