. The thermionic vacuum tube and its applications . ng current in anoutput of the detector is compared. U is the generator of theaudio frequency currents. This can be a vacuum tube oscillatoror a microphone generator such as that described in Section 72.(See Figs. 114 and 115.) Its output passes through a filter F,which transmits only frequencies of about 800 cycles. Thiscurrent is sufficiently large to be measured with a thermo-couple after passing through the receiver shunts S and S> it is atten-uated until the intensity of the tone heard in the receiver T is equal 340 THERMIONIC VA
. The thermionic vacuum tube and its applications . ng current in anoutput of the detector is compared. U is the generator of theaudio frequency currents. This can be a vacuum tube oscillatoror a microphone generator such as that described in Section 72.(See Figs. 114 and 115.) Its output passes through a filter F,which transmits only frequencies of about 800 cycles. Thiscurrent is sufficiently large to be measured with a thermo-couple after passing through the receiver shunts S and S> it is atten-uated until the intensity of the tone heard in the receiver T is equal 340 THERMIONIC VACUUM TUBE to the detecting current coming from the detector tube D. Bymeans of the switch W either the detecting current or the currentfrom the generator U can be passed through the telephone the switch is thrown to the left the current fiom U passesdirectly through the receiver after being attenuated by the receivershunt. When W is thrown to the right the output of U is im-pressed on the input circuit of the modulator M. This low fre-. \smj-
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