Frequency Selective Networks, Inc.

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Frequency Selective Networks, Inc. designs and manufactures crystal‑based and LC filters covering a frequency range from 10 kHz up to 200 MHz, offering low‑pass, high‑pass, band‑pass and band‑reject configurations. The company also produces EMI/RFI mitigation solutions, including EMP, power‑line, screen‑room, facility, signal‑line, data‑transmission and telecommunications filters. All products adhere to the MIL‑I‑45208A quality‑assurance standard. Custom filter designs draw from the full portfolio of response families—Butterworth, Chebyshev, Legendre, Cauer (elliptical), Gaussian, Bessel, as well as TBT, Bode and Lerner topologies. Frequency Selective Networks, Inc. further provides quartz‑based delay‑line electronics for both active and passive analog applications. The firm’s network offerings encompass complete network and system packages, phase and delay equalizers, and impedance‑matching networks. These solutions are employed across a spectrum of sectors such as telecommunications, missile systems, electronic warfare, satellite communications and navigation.

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