. The principles underlying radio communication . ctron tube as a detector see the next chapter, Section 194. An inductively coupled circuit is shown in Fig. 239-a, whichhas been found to be particularly adapted to wave lengthsshorter than 400 meters and also to give good results on longerwave lengths. In this circuit it is essential that the variable RECEIVING CIRCUITS. 427 inductances L2 and L3 shall be continuously variable. Thename variometer is sometimes applied to a form of con-tinuously variable inductance often used with this inductance Lx may be of the usual type, var
. The principles underlying radio communication . ctron tube as a detector see the next chapter, Section 194. An inductively coupled circuit is shown in Fig. 239-a, whichhas been found to be particularly adapted to wave lengthsshorter than 400 meters and also to give good results on longerwave lengths. In this circuit it is essential that the variable RECEIVING CIRCUITS. 427 inductances L2 and L3 shall be continuously variable. Thename variometer is sometimes applied to a form of con-tinuously variable inductance often used with this inductance Lx may be of the usual type, variable bysteps. Condenser C2 may be variable by steps, and is not neces-sarily continuously variable. Ci and Li are adjusted to approxi-mately the wave length of the incoming signal, but it is notessential that the primary be accurately tuned. It is, however,essential that the secondary be very accurately tuned, and in-ductance L2 must be very carefully adjusted. The inductanceL3 in the regenerative circuit (see Sec. 199, p„ 487) should also be. >fl^K^-| |-r^^
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