LOOP RECEPTION.

Shannon News, 14 June 1927, Page 4

LOOP RECEPTION.

INCREASING THE RANGE. HINTS FOR EXPERIMENTERS. Many owners of loop sets, desiring to increase their receiving radius, connect an outside antenna to one terminal of the loop. Their distance range is increased to an extent thereby, but th e selectivity suffers. In the case wlicro.the set is of super-hetrodyne, the use of an outside antenna in this manner will cause the oscillations produced within the receiver to go out from the antenna and disturb the other listeners of the neighbourhood. A much better plan is to wind an inner loop within the large one, and use this to connect the aerial and ground to the set inductively. The loop becomes an antenna coupler, and while some selectivity is also sacrificed to gain distance, the set will tune - out stations with greater ease than if tlic aerial were connected directly to the large loop. The plan of winding the inner coil within the main loop is: Get about 10 or 15 feet of stranded lamp-cord wire, and wind about throe or four turns, starting close to the centre of the loop. ;

The closer to the oentre of the loop form and the further from the main loop •winding the inner coil is placed, the more selective will be the tuning. .

The inner coil should .be wound in the same direction as .the windings of the large loop are running. Con nect the outside aerial to the terminal of the inner loop. The ground l s connected to the other terminal. If the signals do not seem to be satisfactory, reverse the aerial and the ground connections.

With this plan, the . loop will be found to have lost a great deal of its former directional effect. However a greater radius of reception will be obtained to offset this. If the in terference is too great, the aerial and ground connection can be taken off.