Show x Z edited by 0 douglas baltor editor of 0 radio merchandising 0 0 circuit that will enable you to take Adva advantage tage of selectivity and anti antl static properties of the loop antenna without resorting to use of radio frequency amplification sy A A KUBIAC we know that we can reduce tile the static signal ratio by reducing the he size of the antenna however below a bertah size the regular form ot of antenna th li not as efficient a collector as the loop antenna the loop antenna proves to be an improvement over tho the picture molding antenna because it produces signals signal equally as s trong strong while at the same time the static stall signal ratio Is much more favorable vo rable Ordina ordinarily tilly the lise ise of the loop antenna tor for distant reception Is confined to receivers employing one or more stages ot of radio frequency amplification this should not give you the impression that it Is not practical to use a loop anten antenna nain in connection with etli the ordinary regenerate five e type it Is entirely possible with n receiver consisting ot of loop antenna regenerative detector find and two step audio frequency re quency amplifier to hear con concerts gerts rom stations miles distant with sufficient volume volume to make it J the circuit shown will enable you to tb take advantage of the selectivity and antt anti properties ot of tile the loop iop antenna without resorting id to the ute use of radio frequency fic quency amplification you will viii notice that the loop Is connected directly across the grid filament circuit without employing any form of coupling lol coll I 1 catlon cation Is obtained by tuning the plate cl circuit acu it to resonance with tho the grid circuit by employing a vart ometer as shown this form ot of regeneration central control Is preferred in place of the tickler feed back method when using a loop antenna directly in the grid filament circuit the above circuit shows allows a two step audio frequency amplifier to build up the signal streng strength ns as it Is not advisable to attempt reception on loop with a detector only now it m must list be remembered that what we ve are arc a after f Is not a means of getting th the ile greatest possible olane of sound in it the phones from a given signal but out a means of getting good clear reception free from froin interfering noises the loop antenna affords the best means of accomplishing this without the use of tny special form of apparatus the loop ia iatonna hiten tenna nn Jio however wever Is far from being perfect in this respect and permits considerable static to pass into uie the detector but being the best we have in the line of ord ordinary lary apparatus pa ratus we will have to be content with separating the rest of the static from froin the signal after aft erit it has been detected the shown across the of 0 the amplifying transformers are ordinary commo commonly rily usel used as grid leaks the introduction of these ats si ta aces into the circuit 1 as shown reduces the signal strength somewhat but helps greatly in eliminating tube tuba noises and the still existing static interference ter ference new york sun |