. Practical wireless telegraphy; a complete text book for students of radio communication . eakage over the walls ofthe muffler box can be determined by disconnecting the condenser discharge circuit from thespark gap and making another temporary discharge gap outside the muffler. If a normalspark discharge is now obtained, but an intermittent or partial discharge when the circuitis re-connected to the spark gap proper, it is obvious that severe leakage exists. (e) Test for the Insulation of a Wireless Aerial.—Leakage across the insulators of awireless telegraph aerial can be determined by the
. Practical wireless telegraphy; a complete text book for students of radio communication . eakage over the walls ofthe muffler box can be determined by disconnecting the condenser discharge circuit from thespark gap and making another temporary discharge gap outside the muffler. If a normalspark discharge is now obtained, but an intermittent or partial discharge when the circuitis re-connected to the spark gap proper, it is obvious that severe leakage exists. (e) Test for the Insulation of a Wireless Aerial.—Leakage across the insulators of awireless telegraph aerial can be determined by the test shown in Fig. 327, The secondarywinding of an induction coil or high voltage transformer is indicated at the spark gaj. S-1,the antenna at A, and the earth connection at E. Assume when the discharge gap S-1 isshortened to a fraction of an inch (say 1-16 of an inch) no spark discharge is obtainedupon closing the primary circuit of the coil; this is a positive indication that the antennainsulation is broken down. The aerial should now be lowered, and the defective KEY TRtNSFORMtR Fig. 326—Showing How Defects in the Primary andSecondary Windings of the Transformer May be Located. LOCATION OF TROUBLES 313
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
