Eliminating Interference

Radio Record, Volume III, Issue 17, 8 November 1929, Page 28

Eliminating Interference

Use of a Counterpoise TN localities where interference from power mains or eleetrical machin--ery is experienced, an improvement may be effiected by the use of .a counterpoise earth, This consists of two or more wires arranged, if possible, symmetrically underneath the serial. It is important that these wires should be just, as well insulated from earth as the ateial itself, . ., Yor example, if a three-wire counterpoise is to be erected, the central wire should be arranged exactly underneath the aerial, and the two outer wim should run parallel to this at a distance of abgut four feet. If this is impracticable, the counterpoise should be erected as nearly in this position as ~ possible. ’ The height of: the counterpoise above the ground may be anything from one foot to eight feet, the former distance being the more effective, and the latter the more convenient. All the wires should be joined at one end and a single lead then taken to the earth terminal of the set.