Open Box MFJ-5008 ULTRA-SONIC DETECTOR/RECEIVER, 18 IN SN138988

Open Box MFJ-5008 ULTRA-SONIC DETECTOR/RECEIVER, 18 IN SN138988

MFJ Ultrasonic Receiver pinpoints power line noise

HF and VHF operation can be affected by noise on the bands which makes it hard to hear the weaker stations and adds to your fatigue.

Many times the noise is coming just outside your doorway, from the power lines. Power companies are usually very willing to help out with noise issues, but not all companies in this age of financial limitations will have the necessary equipment or trained personnel to properly locate nearby noise sources.

MFJ-5008 aids you in locating the noise sources generated by corona discharge and arcing components on the power system. This device is an acoustic receiver tuned to the ultrasonic range of 40 KHz allowing you to hear the ultrasonic noise generated by the corona discharge and arcing connections that generate the power line static on your radio.

Using an 18-inch diameter plastic dish giving a narrow beamwidth to pin point noise sources to less than 12 inches at 50 feet. The dish also has a short focal point making the overall front to back depth just seven inches. With the handle mounted close to
the dish, the center of gravity is closer to the handle reducing fatigue on the hand from the weight pulling down in front.

An ultrasonic transducer mounted inside a sturdy metal support helps reduce dish bending and warping.