The one-piece unit is connected in series between the output of a 5 mfd or larger impulse fault locating system such as the VON Model EI 30-6/35 and the faulted cable. The coupler (filter) utilizes the arc reflection method. A digital memory radar or real time analog radar connected to it displays the entire faulted cable including the ends, splices, and any connected transformers. The location of the fault is determined by the down blip which shows on the radar screen with each impulse.

Weight - 60 pounds (27.3kg)

Width - 18.0" (45.7cm) as measured over the handles

Depth - 8.375" (21.3cm)

Height - 21.0" (53.3cm)

The tan fiberglass cased unit contains the following:

1. A high voltage inductor to extend the length of the "thump" from an impulse fault locator so that the low resistance caused by the arc at the fault can be viewed with the radar. It also serves as a wave trap so the radar does not see the internal low resistance of the thumper.

2. A high voltage and high frequency coupling (filter) system fully protected against high voltage spikes. Any real time radar which is connected through the BNC connector is electrically separated from the faulted cable so it remains at ground potential.

3. A 10 foot HV input cable or HV input studs inside the enclosure for connection to any impulse fault locator HV output cable. The 10 foot input cable can be provided with a male connector to fit a unit such as the EI 30-6/35 or it can be left without a connector.

4. A fixed 60 foot long high voltage output lead is normally provided. Longer leads are available. It can replaced with a short lead with HV connector designed to fit the VON HV reel system.

5. The Model 22A contains a push-pull bypass switch which shorts out the inductor so that the normal impulse from the thumper is put on the cable to make a "thump" sound at the fault to pinpoint the place to dig.

The VON Corporation, P.O. Box 110096, 1038 Lomb Avenue SW Birmingham, AL 35211 (205)788-2437