Induction Coil 3-4
The antisidetone operation of the circuit results from the elec
trical balance between the impedance of the 3-4 section of the induction
coil in series with the 0.3-mf capacitor, and the impedance of the line
circuit consisting of 4 miles or more of Wire W-110-B connected to
terminals L1 and L2. On shorter lines the antisidetone is less pro
nounced, although still effective.
induction coil. The induction coil (Coil C-105) is an autotrans-
former with one continuous winding tapped at terminals 2 and 3 so as
to form the 1-2 section, the 2-3 section, and the 3-4 section. ( See figs. 25
and 26.)