OCR Text |
Show Picking, Holding Distant Stations Circuit When Properly Con-ctructed Con-ctructed Will Be Found Satisfactory. There are prohahly more single-circuit receiving sols In operation "than any other kind. Many of them are not worked at their full efficiency. Most acta assembled with the usual varloconpler runnot he brought to the most sensitive regenerative point, because be-cause of the Insufficient wire on the rotnr, especially when used with a small aerial. If properly constructed the accompanying accom-panying circuit will be found sensitive und cnpiilile of picking up distant stations sta-tions mid holding them, With a little cure a good coupler iiny he constructed easily. The stntor should he wound with aliout ." turns of No, 21 dec. wire. A few sixes larger or aiimller will work aa well. Taps xhouid he brought out about every live turn. The rotor should have 00 to 80 turn of No. 24 dee, wound (Irmly on i suitable rotor hull which can he purchased reasonably at most dealer. good variometer must be procured, one with plgtull or braided wire connection con-nection preferable, for If these connections con-nections fall, even momentarily, It will convert the act Into u transmitter and i become a nuisance to the neighbor- - gcos hood. It would be better to place thla variometer at least one foot away from the varlcoupler. In operation the tickler Is placed with the windings almost parallel with the tuner, Ordinarily this would cause strong oscillations, but the variometer will have a stabilizing effect, and will be the adjustment that can be depended upon to control regeneration. Maximum regeneration will be obtained without any danger of losing the station due to set oscillating suddenly. The variable condenser Is placed with tha movable plates connected lu the ground lead which eliminates body capacity. Anyone who has constructed die Flewelllng circuit can easily try this Idea out by placing two binding posts around the tickler and attaching a variometer In shunt with the tickler. Of course, the super effect must be discontinued by throwing the switch provided for that purpose. Kudlo Digest. |