OCR Text |
Show Service of Loop Aerial in Securing Selectivity The greatest objection to the use of a loop iii-rlal in securing maximum selectivity iK (in- ,,ss ,,f volume. When difficulty Is experienced from the interference in-terference of two or more stations near the same wave length, or when the sialic becomes so heavy as to drown out even Ihe locals, (he trouble may be reduced at least 7,"i per cent by closing the croi'.nd switch, thin Kmiiudlng the aerial, und connecting ' the net to a :i or 4 foot loop of 10 or 1J turns, shunted by a variable condenser, conden-ser, the loop to be place, as near as possible to the wire connecting the aerial to the ground. I Using an ordinary Ihree-clroull tuner ami a WIMI tube, a correspondent correspon-dent writes, I regularly receive l.mK) 1 1 i 1 1 ( through static that would laiikii reception Impossible otherwise, and also cut out code Interference practically prac-tically entirely. The method Is equally ellielent wllh n two-circuit set, the only requisite being that the loop be not more than 2 or .'1 feet from the ground wire. A plaster wall separating separat-ing them Hei-ms to make no dUTon-iica, how ever. Itadlo I Ift. |