General Information
Bulletin Number: 93-9-10Reference Number: 349212R
Publish Date: 7/93
Subject:
RADIO FREQUENCY INTERFERENCE IDENTIFICATION AND DIAGNOSIS
Models Affected:
1993 AND PRIOR ALL MODELS
The purpose of this information is to help in the identification and diagnosis of Radio Frequency Interference (RFI). RFI symptoms may include noises, interference, static, whines, pops. and poor reception of stations normally receivable by the radio system. These symptoms may also apply to any two-way communications radio installed in the vehicle including HAM, police, fire, business band and cellular phones.
Radio Frequency Interference is the undesirable disturbance of an electrical system or device with another electrical system or device. The following charts will help identify:
1. If the symptoms are related to RFI, and
2. The source of the interference.
It may be helpful to obtain a copy of the Delco Electronics Audio Systems Diagnostics Guide 1992 edition. This is a manual aimed at identifying, diagnosing, and repairing the radio system. This manual is available from STG; item # 19007.03-1.
You may also want to consult your division's service bulletin concerning Radio Telephone Installation Guidelines. This information will identify the proper methods and routing for all installations of two-way communications devices.