Radio broadcast .. (1922-30)

Record Details:

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3I2 Radio Broadcast tubes, and this in general is true when any of the other different types of dry-cell tubes are used. The volume obtained, however, with dry-cell tubes under correct conditions permits loud speaker operation on distant stations. It is suggested, however, that with UV-I99 tubes as radio-frequency amplifiers, C-3OI-A or UV-2OI-A tubes be used for the audio-frequency amplification. THE MOST SUITABLE ANTENNAS AN OUTDOOR antenna 60 to 70 ft. long and 30 to 40 ft. high, is possibly the best for use with a neutrodyne receiver. The multiplewire antenna is generally no better than the single wire type for receiving. A great many people desire to use an indoor antenna, either through necessity or to eliminate the trouble and expense of an outdoor installation. With a five-tube neutrodyne receiver, constructed in accordance with these articles, such an arrangement is feasible and in fact very good results can be obtained if one does not insist on getting the distant stations. A stretch of wire 50 or 60 ft. long in an apartment will work nicely, but this same length of wire should not be coiled around the wall in a single room and the same results expected. There is still loop reception to be considered. Many people are using neutrodyne receivers with loop antennas. There are several methods of connecting a loop to the receiver: connecting one terminal of the loop to the antenna ~> ^ o o o p 0 P 0 x— • -v S o M o p CORE -F FIG. 3 Showing the audio-frequency transformer connections MR. STARK ADJUSTING THE SECOND " NEUTRODON binding post; connecting both terminals to the antenna binding post, thus shortening the loop itself; connecting the loop in series with a variable condenser and then connecting the condenser and loop in series with the antenna and ground binding post; and connecting one terminal to the antenna post and the other to the ground post. This is the arrangement most frequently used. In any of these cases it will usually be best to have the ground binding post to the receiver connected to the ground wire. The five-tube receiver described is not designed primarily for loop reception and an outdoor antenna is strongly advised. "TROUBLE SHOOTING" THERE are people, who build receivers, that have very little technical knowledge, and it is somewhat difficult to describe to them technical processes. Even the simplest thing which the radio amateur or experimenter takes for granted are at first puzzling to the uninitiated, and it is not surprising that many people who have constructed neutrodyne circuit receivers have not been able to obtain complete satisfaction at their first efforts. A detailed list of " trouble-shooting" instructions that will usually aid the home constructor to put the breath of life into his receiver satisfactorily follows: +8