. Practical wireless telegraphy; a complete text book for students of radio communication . own in Fig. 325. It would be well to remark here that the mere fact that signals can be heard when theradio set is thrown in the receiving position, does not insure that the circuits are inproper condition or that the receiver is functioning properly. In radio-frequency circuits aeoil may be broken but current will flow due to the capacity between the adjacent parts ofthe broken turn. The better way to determine if a receiving set is working properly is to setit into excitation by a wavemeter as shown i
. Practical wireless telegraphy; a complete text book for students of radio communication . own in Fig. 325. It would be well to remark here that the mere fact that signals can be heard when theradio set is thrown in the receiving position, does not insure that the circuits are inproper condition or that the receiver is functioning properly. In radio-frequency circuits aeoil may be broken but current will flow due to the capacity between the adjacent parts ofthe broken turn. The better way to determine if a receiving set is working properly is to setit into excitation by a wavemeter as shown in paragraph 173, page 206. The wavemeter isset at a particular wave-length followed by adjusting the primary and secondary circuits toresonance. Now, if variations of the inductance of the primary and secondary circuit willcause the signals from the wavemeter to disappear, it is a fairly positive indication that thetuner is functioning properly. In other words, proper functioning is assured if the resonantadjustments on the receiver are sharply defined. 316 PRACTICAL WIRELESS TELEGRAPHY. Fig. 331—Indicating a Test for an Open Circuit in aReceiving Tuner. (o) Locating an Open Circuit in the Primary or Secondary.—The diagram of Fig. 331shows how to locate an open circuit in the primary coils of a receiver. The binding posts, A, E, are assumed to be those connecting to the aerial and earthrespectively. With the battery and head telephone connected as shown, the inductance changing switch is varied from point topoint until the click in the receiver disap-pears when the telephone circuit is contact point on the switch where thecircuit tests open is obviously the pointat which the primary coil is broken. A short-circuit is not apt to exist inthis winding, as generally, it is made upof. a single layer. A similar test is applied to the second-ary winding but it is slightly more difficultto make connection with this winding be-cause the connections from either end ofthe c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
