A feedback voltage in the transmitter’s output amplifier used to prevent amplifier overload. A feedback voltage in the receiver circuit to prevent fadingĪLC – Automatic level control. URL: PropagationĪGC – Automatic Gain Control. Propagation generally improves with lower measurement numbers. Used in FM receivers to prevent drift.ĪFSK – Audio frequency shift keying (as opposed to frequency shift keying, FSK)Ī-index – An index of the conditions of the Earth’s magnetic field as measured at Boulder, Colorado. Also abbreviation for AfricaĪFC – Automatic frequency control. Still used in the UK.ĪF – Audio Frequency 20 to 20,000 hertz, the human hearing range. One or more numbers and/or symbols are keyed in with a telephone key pad and transmitted to the repeater.Īerial – Used in the early days of radio – sometimes referring to an outdoor antenna.
#Ehf echolink stations code
Abbreviated as amps.Ī Battery - in early radio, batteries were the prime source of power – The A battery provided the filament voltage, the B-battery furnished the B+ or the Voltage to the plates of the tubes, and the C battery provided the grid-bias voltage for the tubes.Ībsorption – The reduction in a radio signal strength in the ionosphere.Īccess code – (Repeater Term) A code to activate a repeater function e.g. 6.24 x 10^18 electrons moving past a point in one second, equals one ampere.
Current is a measure of the electron flow through a circuit per unit of time. A – Ampere – Unit of current measurement.
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