. The Armstrong super-regenerative circuit . ated above the set isprobably operating correctly. It should now be tuned to asignal of more or less steady character such as a broadcast-ing station, or a wavemeter excited by a buzzer and theadjustment of B battery and negative C battery madeto give loudest signals. 7. If there is not a great increase in signal strength betweenthe detector and the first stage of audio-frequency amplifierthe filter is not working properly. This should be checkedover and the proper adjustments made. Before concluding it would be a mistake not to caution theamateur t
. The Armstrong super-regenerative circuit . ated above the set isprobably operating correctly. It should now be tuned to asignal of more or less steady character such as a broadcast-ing station, or a wavemeter excited by a buzzer and theadjustment of B battery and negative C battery madeto give loudest signals. 7. If there is not a great increase in signal strength betweenthe detector and the first stage of audio-frequency amplifierthe filter is not working properly. This should be checkedover and the proper adjustments made. Before concluding it would be a mistake not to caution theamateur to be patient in his efforts to get the circuits operating. Thedegree of amplification obtained for the number of tubes used is be-yond anything yet developed. Naturally the problem which must besolved is more difficult. Minor details that could be safely neglectedin the straight regenerative receiver are of major importance in thenew circuit. A few hours of perserverance will be rewarded ahundred times over once the circuit is in 50 The Armstrong Super-Regenerative Circuit CHAPTER VII. T^^ OR the convenience of the amateur in purchasing the materialhi necessary for the different circuits described there is Kstedbelow the apparatus which will be required, for the circuitshowing in Figure No. Varicoupler1 Varicoupler ball1 Variable condenser .0005 mf. 1 Variable condenser .001 mf. 2 Variable condensers .0015 Fixed condensers .001 mf. 1 Fixed condenser ,01 mf. or larger 2 1500 Honeycomb or Duo-lateral coils 3 Vacuum tube sockets3 Filament rheostats 3 Hard vacuum tubes 2 A battery potentiometer *1 6 Volt Storage Battery 6 221/2 Volt B Battery 3 Small flashlight cells 1 Pair telephone receivers Additional material such as filament control jacks, telephoneplugs, coil mountings, etc., may of course be added at the readersoption. Circuit showing in Fig. No. 2 the following parts are required:— 1 Varicoupler 1 Variable condenser .0005 mf. 3 Variable condensers .00
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradio, bookyear1922
