Use and Construction of A Noise Sniffer

Noise Sniffer:

The Noise Sniffer can be used along with the vehicle's Radio to LOCATE HOT SPOTS which are generating Radio noise interference. These HOT SPOTS can be found in the Harnesses, in the upper part of the dash or even between the hood and the windshield. The Sniffer can be made from an old piece of Antenna Lead-In from a mast or Power Antenna. The longer the Lead-In the better. Make the Noise Sniffer as shown in Figure above. The Antenna Lead-In with the black coating and braided shield stripped back becomes the Sniffer. When the Sniffer is plugged into the Radio's Antenna socket it can then be used to probe and search out HOT SPOTS.
1. While listening to the complaint noise, disconnect the Antenna and plug the sniffer into the Antenna socket.
2. Turn the Radio Volume up.

Checking For Noise On A Wire:

3. Search for the noise source, keeping fingers off the probe end. When checking for noise on wire, the best results will be achieved when the sniffer is placed parallel to the wire.