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A transponder which responds on a frequency different from that of the interrogating signal.



Related Terms

INTERROGATION

The transmission of a radio frequency pulse, or combination of pulses, intended to trigger a transponder or group of transponder.

VHF

Very high frequency radio transmission.

WIND ROSE

A diagram showing the relative frequency and sometimes the average speed of the winds blowing from different directions in a specified region.

OCCUPIED BANDWIDTH

As defined by the International Telecommunication Union (ITU) the frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5 percent of the total mean power radiated by a given emission. In some cases, for example multichannel frequency-division systems, the percentage of 0.5 percent may lead to certain difficulties in the practical application of the definitions of occupied and necessary bandwidth; in such cases a different percentage may prove useful.

LOW-FREQUENCY COMPENSATION

Compensation that serves to extend the frequency range of a broad-band amplifier to lower frequencies.

HETERODYNE FREQUENCY METER

A frequency meter in which a known frequency, which 269 heterodyne frequency meter hermetic seal An airtight seal. heterodyne measurement may be adjustable or fixed, is heterodyned with an unknown frequency to produce a zero beat or an audio-frequency signal whose value is measured by other means. Also known as heterodyne wavemeter.

FM

Frequency modulation.

AUDIO-FREQUENCY METER

One of a number of types of frequency meters usable in the audio range; for example, a resonant-reed frequency meter.

GAIN-CROSSOVER FREQUENCY

The frequency at which the magnitude of the loop ratio is unity.

ULTRASONIC

Having a frequency above the audible range. Frequencies below the audible range are called INFRASONIC.

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