FIG. 37. A Damped Oscillation.
Close-Coupled Transmitter vs. Loose-Coupled Transmitter
For this reason the old style helixes are now practically obsolete and the loose or inductively coupled helix is the one most commonly used. Loose coupled helixes are also often termed oscillation transformers.
FIG. 38. An Inductively Coupled Helix.
An ordinary transmitter tends to emit two sets of waves of different length. By carefully adjusting the coupling, pure trains of waves are formed by attracting the apices of the two sets of waves into one.
LESSON EIGHTEEN. SPARK GAPS.
A Spark Gap is the medium across which the oscillatory discharge takes place. It usually consists of two electrodes of zinc alloy, nickel steel or brass, suitably mounted on an insulating base and standards.
