It has been shown that a primary cause of VHF and UHF interference to professional condenser microphones is inadequate termination within the microphone of the shield of the microphone's output wiring, a fault commonly known as the pin 1 problem. Tests using only audio frequency test signals generally fail to expose susceptibility to radio frequency (RF) interference. Simple RF tests for pin 1 problems in microphones and other audio equipment are described that correlate well with EMI observed in the field.
Author:
Brown, Jim
Affiliation:
Audio Systems Group, Inc., Chicago, IL
AES Convention:
115 (October 2003)
Paper Number:
5897
Publication Date:
October 1, 2003
Subject:
Instrumentation and Measurement
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