. (The) oscillation valve in the transmission and reception of radio messages . Corrarrt~ 1 We may contrast Fig. I, which repreeents thephenomena involved in the transmission and rece^>tion ofsignals by means of the discontinuous wave system, withFig. II, which deals with the continuous wave system. The continuous wave transmitter aerial radiatesa steady stream of waves shown by graph 0-1, Tig. II, anda similar oscillating E. M. F, is impressed across theterminals of the oscillation detector at the receivingstation. The telephones would give no response, however,as the frequency is radio. T
. (The) oscillation valve in the transmission and reception of radio messages . Corrarrt~ 1 We may contrast Fig. I, which repreeents thephenomena involved in the transmission and rece^>tion ofsignals by means of the discontinuous wave system, withFig. II, which deals with the continuous wave system. The continuous wave transmitter aerial radiatesa steady stream of waves shown by graph 0-1, Tig. II, anda similar oscillating E. M. F, is impressed across theterminals of the oscillation detector at the receivingstation. The telephones would give no response, however,as the frequency is radio. This stream of oscillationsmay be interrupted at the receiving station, say 1,000times per second by means of a ticker, and will give theradio frequency oscillation groups represented by graph of these groups is represented in graph 0-3,and the resulting telephone current by graph 0-4. RECEIVER CIRCUITS Ordinarily the modern receiving set consists ofan open primary circuit, and a closed, or secondary circuit. A representative circuit is shown in Figure OpenCircuit A = AerialL-3 = Loading InductanceL-1 = Primary Receiving Tran 5for me C-3 = bhort wave CondenserG = Ground L-2 = Secondary of Receiv-) C-1C-2 TD ing TransformerVariable CondenserShunt CondenserTelephonesRectifier or Detector ) Closed(Circuit The open and closed circuits shown in Fig. Ill areinductively coupled. Conductive or direct coupling may be usedas in Fig. IV, or the so called electrosttitic coupling in Fig. V. c
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