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These circuits permit selective transmission line monitoring without requiring any switching for removing line terminating impedances during the monitor mode.
English (United States)
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Transmission Line Monitor Circuits
These circuits permit selective transmission line monitoring without requiring
any switching for removing line terminating impedances during the monitor mode.
The repeater input impedance must be high in monitor mode in order to avoid
loading of the transmission line. The repeater input impedance must match the
characteristic impedance of the transmission line in repeater mode in order to
In the simplified block diagram of Fig. 1, the line terminating
impedance Z(t) is permanently connected between the input of
amplifier 1 and ground. The transmission line driver is of a type
which is put into a high impedance condition when it is turned off.
Amplifier 2 is used for the monitor mode. Amplifier 1 is used for
the repeater mode. The operating modes are as follows:
In the more detailed alternative embodiment of Fig. 2, Z(t) is permanently
connected across the input from the balanced transmission line. A predistorting
driver is used in this case comprising grounded emitter transistors T1-T4 in
series with resistors and a center-tapped transformer winding. The transistors
T1-T4 are turned off in monitor mode. The low-pass filters preceding amplifiers
1 and 2 are selected such that the filter represents a negligible line load.
In the repeater mode, the received signal output is applied to the input to the
respective driver in the two figures.