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FIGURE 1.-DIAGRAM OF CIRCUIT OF COUPLING TO ARO

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Variation constatée à Leafield pendant le signal U.R.S.I. le 27 novembre 1924.

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1min.

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2 min.

Variation de Fréquence. Arc de Leafield, par temps venteux. Fréquence moyenne 25 000~ par seconde.

Variation constatée a Leafield pendant le signal U.R.S.I. le 26 novembre 1924.

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Deviation de la fréquence

moyenne p.p.s.

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Heure de 3 min. Greenwich

30

1 min.

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Variation de fréquence. Arc de Leafield, par temps calme. Fréquence moyenne 25 000~ par seconde.

2mm.

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FIGURE 2.-TYPICAL CURVES OF FREQUENCY VARIATIONS OF A COUPLED ABC TRANSMITTER

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FIGURE 3.-DIAGRAM OF CIRCUIT OF COUPLING TO ARC WITH LINE OF TTANSMISSION

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