. Practical wireless telegraphy; a complete text book for students of radio communication . theoperator should take care to distinguishbetween the currents induced in the wave-meter by the oscillations flowing in theantenna circuit and those set up by induction from the induction sounds in the telephone due to theradio-frequent oscillations are heard £^t adistinct setting of the wavemeter con-denser, but the sounds caused by simpletransformer induction can usually be heardover the entire condenser scale. More ac-curate readings can be obtained by placingthe coil of the
. Practical wireless telegraphy; a complete text book for students of radio communication . theoperator should take care to distinguishbetween the currents induced in the wave-meter by the oscillations flowing in theantenna circuit and those set up by induction from the induction sounds in the telephone due to theradio-frequent oscillations are heard £^t adistinct setting of the wavemeter con-denser, but the sounds caused by simpletransformer induction can usually be heardover the entire condenser scale. More ac-curate readings can be obtained by placingthe coil of the wavemeter close to the earthlead of the transmitter although whenmeasuring the fundamental wave length ofthe usual ships aerial, by use of a sensitivecrystal rectifier, the wavemeter can beplaced 200 or 300 feet from the aerial, pro-vided the inductance coil bears the correctinductive relation to the antenna. 164. General Instructions forTuning a Radio-Transmitter.—Inorder to tune a radio-transmitter to theinternational standard wave lengths,the following measurements must betaken:. ^-^<^ Fig. 213—Another Method for exciting Oscillationsin an Antenna by Buzzer. (1) The natural or fundamental wave length of the aerial;(2).The wave length of the closed oscillation circuit;(3) The wave length of the radiated wave. After the open and closed circuits have been coupled, we must determine: 192 PRACTICAL WIRELESS TELEGRAPHY.
Size: 1410px × 1772px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
