Miniature mobile marker system and method

摘要

A small, portable signal generator provides a unique marker signal modulated with a selectable number of degrees of freedom for insertion into a portion of a broadband communication system (BCS) such as a subscriber installation site that may or may not be connected to the remainder of the BCS. If payload signals are not present or brief interference with payload signals is tolerable, a high level marker signal may be injected with level control upon detection of an egress signal to detect very minor leakage sources and thus increase quality of the qualification of installation or repairs. If payload signals are present, marker signals are held to non-interfering levels and frequencies. Authentication of a signal received through an antenna is expedited and increased in confidence level by synchronization of the marker signal modulation pattern and the signal detector in a receiver.

主权项

1. A test instrument or marker signal injection tool for detecting a shielding flaw in a broadband communication system (BCS), said test instrument or marker signal injection tool comprising
a carrier signal generator, a selectively controllable modulation signal generator that develops a signal which is variable in frequency and amplitude to avoid interference with a payload signal, if present, or to cause marker signal egress from otherwise undetectable shielding defects if no payload signal is present or of interest, a modulator for modulating a signal produced by said carrier signal generator with a signal produced by said selectively controllable modulation signal generator, whereby said modulator produces a dual sideband signal as a marker signal having a modulation pattern with at least two degrees of freedom, and a connection for injecting an output of said modulator into a limited portion of a BCS.