. The principles underlying radio communication . controls, however, are used for the modulating antenna current is not necessarily the condition formaximum speech signal. Some sets are provided with a low-power lamp as a modulation indicator in the lead to the plateof the oscillator tube or in the lead to the generating system ; thelight is brighter during modulation than where there Is no is because the heating effect of a pulsating current is OPERATION OF RADIOTELEPHONE SETS. 527 greater than the heating effect of the direct-current portion ofthe pul
. The principles underlying radio communication . controls, however, are used for the modulating antenna current is not necessarily the condition formaximum speech signal. Some sets are provided with a low-power lamp as a modulation indicator in the lead to the plateof the oscillator tube or in the lead to the generating system ; thelight is brighter during modulation than where there Is no is because the heating effect of a pulsating current is OPERATION OF RADIOTELEPHONE SETS. 527 greater than the heating effect of the direct-current portion ofthe pulsating current would be by itself. Most sets are also pro-vided with a coupling between the transmitter equipment andthe receiver, so that the operator by hearing his own speech mayknow whether the quality is good. As a general rule theantenna current will not vary appreciably during modulationif the speech quality is good. Special types of radiotelephone sets have been constructed forduplex or two-way conversations, so that communication can UJ. 0/ =:b b- Ri Rz
Size: 1543px × 1620px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
