GRID MODULATION.--See Modulation, Grid.
GRID POTENTIAL.--The negative or positive voltage of the grid of a vacuum tube.
GRID VOLTAGE.--See Grid Potential.
GRINDERS.--The most common form of Static, which see. They make a grinding noise in the headphones.
GROUND.--See Earth Connection.
GROUND, AMATEUR.--A water-pipe ground.
GROUND, WATERPIPE.--A common method of grounding by amateurs is to use the waterpipe, gaspipe or radiator.
GUIDED WAVE TELEPHONY.--See Wired Wireless.
HARD TUBE.--A vacuum tube in which the vacuum is high, that is, exhausted to a high degree.
HELIX.--(1) Any coil of wire. (2) Specifically a transmitter tuning inductance coil.