Successful Receiver

Radio Record, Volume III, Issue 3, 2 August 1929, Page 29

Successful Receiver

Parallel Feed B.D. EHING "Parallel’s" letter on the 2-R.F. Browning-Drake prompts me to expound a little in a general way. I have had one of these since "Megohm" first published .he description, and I must say that it is an excellent receiver for an amateur to construct. The main New Zealand stations simpe ly bellow at one, and the Australians require little or no reaction for the same results. I am one of those enthusiasts who do not mind much what the outfit looks like, so long as it works well, "Parallel’s" receiver is a credit to him. I wish he could see mine! However, I commenced operations with 3in. coils and all the rest of it; everything as per specifications. The absorption control of reaction proved a failure, so I installed a moving coil tickler, which I still use; but with a 4 to 1 reduction gear. The next stage was the split primary method, which was quite good, but did not seem to be much of an improvement on the usual method. Some little tim. ago I took the set to pieces and built 24in. coils,. space wound with 26 S.W.G. enamelled, on very thin celluloid formers, using the parellel feed method with 1 mfd, coupling condensers. These latter seem to

be all right and as good as the .5 mfd. usually specified. As you sa,,- this method makes the set very much more stable on the lower wavelengths. As an average constructor, I can strongly recommend a’ those who write you with neutralising troubles to try this method for the BrowningDrake. Coming to the audio side I use large size transformers and both two stage, the last being push-pull, with 2-171A’s feeding through the 25 to 1 output to a M.C. speaker of my own construc-_ tion, The results from this combination are a treat to listn to. I may mention here that "The Radio Record" is responsible for my eliminator as well. As for long distance reception I leave that for the radio "globe trotters." There are dozens of carriers to be had. for the asking, and these can easily be identified by means of a graph. Nevertheless, domestic peace and happiness must take first place. Still, I suppose this could be worked up into quite a good "loge" by a DX

fiend.-

ELIMINATOR

(Dunedin).