Show bulteel lUl teel by 0 douglas editor ot of radio t circuit that will enable you to take advantage of selectivity and antl anti estatio properties lis of the loop antenna a without resorting to use of radio frequency amplification by A A KUBIAC 4 wo we know that wo we can reduce tho the static sib signal ratio by reducing the of tho the antenna No however wever below a certain size tho the regular form fonn of antenna Is hi not us jig efficient a collector as the loop antenna tile tho loop antenna proves to be nn an improvement over tho the picture molding ante antenna niep because cause e it produces signals equally ns as strong while nt at tile the some same time tile the static signal ratio is much more favorable vo rable Ordin ordinarily arlly tile the use of tho the loop nn tenna for distant reception la 14 confined to receivers employing one or more stages of radio frequency nm am this should not give you the im impression pr eAslon that it la Is not practical to use a loop antenna la in pon con inaction with the ordinary rege regencia nerg alvo alive typo type receiver it Is in entirely po poa elble with ta a receiver consi consisting stin g of loop an antenna regenerative detector dc pap and audio to frequency ambit er to beai concerts from stations 00 distant wh sufficient volume to cmike anke it ft enjoyable alie circuit shown will em enable ibl yau to take aban inge of of th the e selbe selectivity tWi t had antl anti static properties of the loop antenna nn tenna without resorting to the itlie use of 0 radio frequency you will notice that the loot loop Is connected latr aly the grad malament jA lanien lament ciri cult u t wl without employing any forn form of coupling poll fall blegen regenerative amplification I 1 ts u by tuning plato resonance ce with the grid hj w i circuit by employing a ni na shown this form of regeneration control la Is preferred in place of the tickler feed buck method 4 when using n loop antenna directly in tile the grid ilIn filament ment circuit the above circuit shows a two step audio frequency timP nm pliner lifler to build up tile signal strength na as it la Is not ad to attempt reception on loop with a detector only now it must bo be remembered that what wo we are after Is not a means of setting getting the greatest possible volume of i sound bound la in tile the phones from a given signal but a means of getting good goad clear reception free from interfering noliea the loop antenna affords the best beat weans means of accomplishing this without altho t the use of iny ny special form of apparatus pa ratus the loop hatetna ha tenna however la Is far from foin being perfect in this respect a and nd permits considerable static to pass into the detector but being the beat we have in the line of ordinary apparatus pa ratus wo we will have to be content with the rest of the static irom tile lie algil signal al after it has been detected 4 the shown across i the darles oi of file lie amplifying transformers are ordinary commonly used ad aa grid the introduction of these re Bh stances into the circuit as shown reduces the signal strength somewhat but filas greatly in eliminating tube tuba noises and the still existing static interference ter ference now new york sun |