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Adjustable attenuation equalizer
| Details |
Inventors: Hindermayr, Martin; Koerner, Georg;
Assignee: Wilhelm Ruf KG (Munich, DT)
Primary Examiner: Gensler; Paul L.
Assistant Examiner:
Attorney, Agent or Firm: Burgess, Dinklage & Sprung
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. |
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DETAILED DESCRIPTION What is claimed is: 1.
Attenuation equalization in the circuit of an adjustable four-terminal network for correcting the frequency-related attenuation curve of cables comprising a bridged T circuit containing ohmic resistances and having two fixed ohmic resistors in series with one another, bridged by a bridging impedance, the bridging impedance provided by a series-resonant circuit having an inductance, a condenser and a first variable parallel resistor having a resistive track, said attenuation equalizer having a shunt impedance transverse to said bridging impedance formed of a parallel-resonant circuit parallel thereto having an inductance and a condenser in series with a second variable resistor having a resistive track, said variable resistors being traversed by a common traversing means, said fixed resistors, said variable resistors, said inductances, said condensers being mounted on a single support of insulating material, and the plates of the condensers are disposed parallel and in lateral spaced relationship to the corresponding variable resistors of the bridging impedance and shunt impedance such that they serve simultaneously as wiper tracks for the common traversing means of the variable resistors.
2.
Attenuation equalizer of claim 1 wherein the condensers are plate condensers having condenser plates arranged congruently on both sides of the support.
3.
Attenuation equalizer of claim 1 wherein the electrical characteristic of the resistive track of the variable resistor of the bridging impedance runs in the opposite direction to the electrical characteristic of the resistive track of the variable resistor of the shunt impedance.
4.
Attenuation equalizer of claim 1 wherein the electrical characteristic of the resistive track of the variable resistors of the shunt impedance and bridging impedance are the same.
5.
Attenuation equalizer of claim 1 wherein the variable resistors are linear.
6.
Attenuation equalizer of claim 1 wherein said single support has a pair of opposed outer longitudinal edges and the distance from one outer longitudinal edge of said support to the condenser plate of the series-resonant circuit is equal to the distance from the opposite outer longitudinal edge of said support to the inductance element of the series-resonant circuit, and the variable parallel resistor of the bridging impedance is located centrally between the condenser plate and the inductance element
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Telecommunications 
