We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
RADIO AGE— "THE MAGAZINE OF THE HOUR"
17
H|l|l|l|l|l|l|lhF
2Z^/ZV
<So -So
Figure 4. A single circuit regenerative circuit in connection with 1 step RF amplification and 1 step AF amplification. L 1 and L 2 are the primary and secondary of a variocoupler respectively.
ample selectivity and good range. The circuit appeared in the questions and answers section.
H. B. K., Chillicothe, Mo.
Question: Kindly print a hookup of a circuit showing one stage of audio frequency amplification in connection with a circuit using either a loop antenna or regular aerial. The set is to be used with U V 199 tubes throughout.
Answer: In Figure 2, I am printing a circuit showing a loop receiver arranged to use either an aerial of the regular type or a loop. The audio frequency amplifier is shown in darker lines. The amplifier may be constructed according to the instructions given for a two stage amplifier given elsewhere in this issue.
C. H. P., Davenport, la.
Question: Please send me a diagram of what you consider the best circuit using detector and 2-stage of audio amplification for use with either loop of regular antenna. I am in search of a circuit that will give me volume as well as distance, regardless of cost of building. I have a Reinartz spider web coil set, built according to your instructions and am having wonderful results with it but I am in the market for something more elaborate. This circuit is to be used for broadcast reception only.
Answer: You will want a selective, efficient circuit, such as 1 am printing in Figure 5. From personal experience, can say that it is yet the most efficient circuit I have used, and will give unlimited range if properly constructed. The radio frequency stage is shown to increase the range of the set, with the two stage audio amplifier, which can be con
structed as shown elsewhere in this issue, will give plenty of volume. This circuit requires patience and skill in tuning, and you will have to adapt yourself to the noises and sounds of the set to get the best results.
J. A. O. B. Brooklyn, N. Y.
Question: In the May issue of Radio Age, you featured the Erla circuit, which I constructed according to the instructions given. I am enclosing herewith a diagram showing how I have connected the set and with which I am getting good local results but with little success on long distance stations. Is tlie enclosed diagram correct? Would the addition of more tubes assist in bringing about better results? I have a 75-foot aerial; would it be a good plan to put a condenser in the ground lead? I would like to have as powerful a set as possible and would like to have your opinion with reference to this.
Answer: I am mailing you a diagram which shows the limitations of your set,
' ti|i|i|i|ib
F Figure 5. A simple regenerative circuit of great efficiency, 1 stage of radio frequency amplification, and two stages of audio frequency amplification. L 1 is an ordinary variocoupler, L 2 a 25 turn honeycomb coil, and L3 a variometer. The drawing illustrates the use of the audio frequency amplifier described in this issue.