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AUTOMATIC RECEIVER IM DETECTION AND PROTECTION SYSTEM

IP.com Disclosure Number: IPCOM000007331D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-15

Publishing Venue

Motorola

Related People

Authors:
James Gehrke Pete Walter

Abstract

It is common practice to switch the gain of a receiver to improve performance of a receiver when suffering interference from Inter modulation signals. The 'Local/Distance' switch is used on Motorola Radius products and may other receivers. The prob- lem with known products is that the switch is a manual operation controlled by the user. This is unde- sirable because it takes an experienced user to iden- tify IMing signals for analog systems from the detected audio. In addition this is not practicable in the new digital systems because the recovered voice coding degradation does not have a recognizable audio characteristic. So an automatic system to switch to lower receiver gain for the best performance is required.