Arrangement for measuring cross talk properties in transmission lines

Claim 2

In an arrangement for measuring cross talk properties between an interfering line and an interfered line including an adjustable frequency transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver said first receiver being connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk potentials received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a local oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said means for tuning comprising said local oscillator as a tuning means common to both said first and second receivers, and means utilizing the intermediate frequency of said second receiver for converting the intermediate frequency of said first receiver to a second intermediate frequency zero and a low pass filter for selectively passing said intermediate frequency zero to said voltage measuring means for evaluating the cross talk potentials.

Claim 3

The arrangement of claim 1, including a phase shifting stage connected to the path of the intermediate frequency voltage of said second receiver to compensate for phase shiftings of cross talk voltages.

Claim 4

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver, said first receiver being connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk potentials received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a lOcal oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said means for tuning comprising said local oscillator as a tuning means common to both said first and second receivers, and voltage measuring means connected to the output of said second receiver, wherein the selectivity of said second receiver is smaller than the selectivity of said first receiver.

Claim 5

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver, said first receiver being connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk potentials received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a lOcal oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said means for tuning comprising said local oscillator as a tuning means common to both said first and second receivers, and voltage measuring means connected to the output of said second receiver, wherein the selectivity of said second receiver is smaller than the selectivity of said first receiver.

Claim 6

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency wobble transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver, said first receiver being connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk potentials received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a local oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said tuning means comprising a frequency discriminator connected between the output of said second receiver and said local oscillator for deriving an automatic frequency control signal, and further comprising said local oscillator as a tuning means common to both said first and second receivers, a cathode ray oscilloscope having X- and Y- deflection systems, and means for deriving X-and Y- deflection signals from said first and second receivers to indicate a function of said cross talk potentials plotted against frequency on the screen thereof, wherein said X-deflection signal is derived from said automatic frequency control signal.

Claim 7

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency wobble transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver, said first receiver being connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk potentials received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a local oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said tuning means comprising a frequency discriminator connected between the output of said second receiver and said local oscillator for deriving an automatic frequency control signal, and further comprising said local oscillator as a tuning means common to both said first and second receivers, a cathode ray oscilloscope having X- and Y- deflection systems, and means for deriving X-and Y- deflection signals from said first and second receivers to indicate a function of said cross talk potentials plotted against frequency on the screen thereof, wherein said X-deflection signal is derived from said automatic frequency control signal.

Claim 8

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk properties received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a local oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said means for tuning comprising said local oscillator as a tuning means common to both said first and second receivers, voltage measuring means connected to the output of said second receiver, said second receiver having a selectivity which is smaller than the selectivity of said first receiver, means utilizing the intermediate frequency of said second receiver for converting the intermediate frequency of said first receiver to a second intermediate frequency zero, and a low pass filter for selectively passing said intermediate frequency zero to said voltage measuring means for evaluating the cross talk potentials.

Claim 9

In an arrangement for measuring cross talk properties between an interfering line and an interfered line having an adjustable frequency transmitter connected to one end of the interfering line and a first tunable superheterodyne receiver connected to the far end of the interfered line, and a voltage measuring means connected to the output of the first receiver for evaluating cross talk properties received at the far end of said interfered line, a second tunable superheterodyne receiver comprising a local oscillator, said second receiver being connected to the far end of the interfering line, means for tuning said first receiver as a function of the tuning of said second receiver, said means for tuning comprising said local oscillator as a tuning means common to both said first and second receivers, voltage measuring means connected to the output of said second receiver, said second receiver having a selectivity which is smaller than the selectivity of said first receiver, means utilizing the intermediate frequency of said second receiver for converting the intermediate frequency of said first receiver to a second intermediate frequency zero, and a low pass filter for selectively passing said intermediate frequency zero to said voltage measuring means for evaluating the cross talk potentials.