The Birmingham age-herald., 1922-12-17

together what We would call hard, tubes The U. V. 2Ots would be much better. The dio-frequency transformers should all be of the same type, and the io-frequency transformers should also be of the same type or at least of the same general characteristics, especially as regards ratio of turns between the primary and secondary. This circuit If properly fut together should in- crease distance, as you are actually getting two stages of radio-frequency amplification. The tube part of the circuit should be joined to the sec ondary of your tuner in the same manner that the variometer was shown in the diagram. The 23-plate condenser will be shunted across the secondary coil.
 Noises in. Super n
 Q. With reference to the super regenerative, as per your diagram of July 2, I should greatly appreciate your suggestions as to how I may tune this circuit to eliminate the ter ribly whizzing. windstorm effect when two or more stations are send ing at the same time. called hetero- dyne, I am told. have had remark able and very gratifying results. re- ceiving all the distant sta- tions. including Cuba, but of late with the arrival of the cool whether this trouble as referred to above is more than can stand and I have been forced to give up and close for ithe evening. Could honeycomb coils be used in place of the vario- coupler? Is so. what size? What terminals of the D. l.. coils 1.250. 1.5O0 400 are used in connecting these coils in the circuit How far apart from each other? H. c. $.
 F A. The noise that you describe can be eliminated by careful adjustments First of all. a Vernier condenser across the loop condenser will help quite q little. and in the second place. if you, reduce the amount of coupling in the vario-coupler you will eliminate this noise. Of course, this will slightly reduce the signal strength at the same time, but if the noise is annoying it will be worth while to have slightly lower volume with clearer reproduction. Honey comb coils can be used in place of vario-coupler, but ] would not recom- mend the change, since you are getting very good results from the coupler itself; and. as a matter of fact, the coupler Is more efficicnt. It makes but very little difference which way the D. Lg coils are joined into the circuit and it does not mat ter how far apart or close together they are as there is no inductiye relationship between them.
 Try yariometer
 c. I have succeeded in get ting the uper-regenerative circuit working so that 1 can get WIZ and K4KA. There are stin some things that think are not right, as the signals that are clear are not as loud as a single step of audio and X will not work on a horn at all sat isfactory. am using V. T. ? tubes, a loop of three feet diameter with eight turns of No. IS bell wire and a forty three plate condenser with a three-plate one as vernier across it. I have 95 volts and 190 on the plates. In operating the set l turn on the filament current and the large B batteries by throwing switch; then I tune the condensers until l get the stationssending: then turn the roter from right to left until I cut out the squealing and can hear the si ignals clearly; then turn the roter back again from left to right until there is a bad shriek: then a slight turn to the right makes the signals as loud as l can get them. Is this the correct procedure? In listening on my super-regenerator to station the signals come in fine and clear and then fade away and return to the maximum strength, repeating the !. cycle in regular time. How can I overcome this? If the music or voice stops and after pause tarts up again the set frequently shrieks until l turn the roter to the right a few divisions. Revolving the loop makes some difference and win cut