Modem filter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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The main purpose of this device is to reduce the level of various noises in the telephone line, with which it does an excellent job. Transformer T1 is designed for highly efficient filtering of high-frequency interference. This allows you to successfully resist the occurrence of interference due to the operation of electrical household appliances and such an unpleasant phenomenon as the interference of parasitic radio broadcast interference. The plot of the circuit, assembled on passive elements R1, C1 - R2, C2, is intended for frequency correction of the input signal. Transformer T2 performs the function of a passive amplifier of a useful signal.
Transformer T1 contains 2 independent windings of 7 turns each, wound on a ferrite ring strictly symmetrically, i.e. Both windings are wound roughly speaking clockwise. The wire is varnished, 0,4 - 0.5 mm in diameter. Resistance R1, R2 - 10..50 Ohm, which is determined empirically and depends on the length of the line from the ATC to your telephone socket, in which the modem is turned on. Capacitors C1, C2 - 0.1 uF.
Transformer T2 contains 2 independent windings of 30-60 turns each, wound on a ferrite ring strictly asymmetrically, i.e. the windings are wound in different directions. The wire is lacquered, approximately 0,4 - 0.5mm in diameter. Try to place transformers T1 and T2 away from each other - this will improve the overall performance of the device. Ferrite rings of transformers of any size and permeability.
All parts of the filter are located on a printed circuit board with dimensions of 82x19 mm; modern telephone jacks, which are also located on the board, are used as input and output.
Publication: cxem.net
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