Adjustable attenuation equalizer

US4035747A · kind A · utility

Assignee

• Wilhelm Ruf KG · DE

Inventors

• Martin Hindermayr
• Georg Koerner

Key dates

• Filing date: Jan 17, 1975
• Grant date: Jul 12, 1977
• Expiry date: Jan 17, 1995

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B3/145
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Attenuation equalizer in the circuit of an adjustable four-terminal network for correcting the frequency-related attenuation curve of cables including a bridged T circuit containing ohmic resistances and having two fixed ohmic series resistance, preferably of equal resistance value, bridged by a bridging impedance, the bridging impedance being a series-resonant circuit having an inductance, a condenser and a variable parallel resistance wherein the shunt impedance is a parallel-resonant circuit having an inductance, a condenser and a variable series resistance, the latter being adjustable by means of a common traversing device. The resistance elements of the fixed resistances and the variable resistances, the inductances, the condensers and the conductors are mounted on a single support of insulating material, and the plates, layers or the coatings of the condensers are disposed parallel and in lateral spaced relationship to the corresponding variable resistances of the bridging and shunt impedance such that they serve simultaneously as wiper tracks for the common traversing device of the variable resistances.