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RADIO BROADCAST
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is run down and when it requires recharging. However, there are now available on the market certain vacuum tube sets which make use of special vacuum tubes which operate on if volts and | ampere of current. These tubes will operate satisfactorily on a single dry cell, which eliminates the troublesome storage battery. The " B " battery, on the other hand, lasts for months; after which it is renewed.
Once we have attained the vacuum tube category of receiving sets, the only difference in the various offerings is in the matter of elaborateness. The tuning facilities, which means the ease and the preciseness with which the set can be adjusted for any given wave length, are an important consideration. In radio-phone reception it is highly desirable to
be able to tune in a desired radio-phone programme and tune out undesirable programmes. This gives not only choice, but also gives a clear and pure rendition of the desired programme. Otherwise, muddled sounds are heard as though several persons were talking at one time or several orchestras or bands were playing different selections all at one time.
Speaking of tuning, it is well to bear in mind that some of the present offerings are designed with the layman very much in mind. These receiving sets have a simple tuner arrangement, because it is realized that the user does not want to master the handling of a number of controls to be found on the more professional sets. If the purchaser is of an adaptable turn of mind, it may be well to look
This Radio Regenerative Receiving Set, built by A. C. Philips, Hempstead, N. Y., has proved very effective. The antenna is composed of four strands of solid copper wire spaced two feet, eighty feet long, with a twenty-one foot lead-in. Height 5 1 feet. A home-made inductance wound on cardboard is used, with movable secondary, and taps on primary. A home-made variometer is used in the circuit as a tickler. The detector and two step amplification is made of standard parts. Double pole double throw switches connect to honey comb coils for long wave lengths. The following stations have been regularly and plainly heard. WJZ— WGI— WBZ— WGY— WWZ— KDKA— WDL— NOF— aXJ— IBKA— WYEB. The layout was arranged after a great deal of experimenting with different makes of standard parts, and left as shown owing to the fact that results were most satisfactory. Six sets of phones connected in series around the receiving room afford convenience and comfort to those who listen in.