Grid dip oscillator

Grid dip oscillator
"Dipmeter" could also refer to an influential early commercial expert system called Dipmeter Advisor; or may refer to an instrument that measures the "dip angle" of the planet's magnetic field, the field line angle in a vertical plane.
A dipmeter and several accessory probe coils. (Mitamusenkenkyūsho 三田無線研究所株式会社 DELICA DMC-230S2)
Two Heathkit Grid Dip Meters with a set of tuning coils.

Grid dip oscillator (GDO), also called grid dip meter, dip meter, dipmeter, or just dipper, is a measuring instrument to measure resonant frequency of radio frequency circuits. It measures the amount of absorption of a high frequency inductively coupled magnetic field by nearby objects. It is an oscillator whose output energy changes in the vicinity of a resonant circuit which is tuned to the frequency the oscillator generates; somewhat similar to an acoustic tone becoming louder when generated in the vicinity of a resonant cavity or a string tuned to the same frequency. At the heart of the instrument is a tunable LC circuit with a coil that serves as a loose inductive coupling to the measured LC resonant circuit. Resonance is indicated by a dip in the meter indicator on the device, usually based on a microammeter.

Contents

History

Grid dip oscillators were first developed in the 1920s, and were built with vacuum tubes. The devices measured the value of the tube's grid current. Modern grid dip oscillators are solid-state devices and are more versatile. Solid-state versions of the grid dip oscillator are sometimes called gate dip oscillators or emitter dip oscillators in reference to the parts of the semiconductor whose current is being measured instead of the grid current on a vacuum tube.

Applications

Grid dip oscillators have been widely used by amateur radio operators for measuring the properties of resonant circuits, filters, and antennas.

See also

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • grid-dip meter — noun : a device for testing radio frequencies that consists of a vacuum tube oscillator having in its grid circuit a current indicating meter which indicates a decrease in current when the oscillator and the circuit to which it is coupled… …   Useful english dictionary

  • GDO — son las siglas en inglés de Grid Dip Oscillator. Técnicamente, y por razones históricas, se lo podría llamar detector de resonancia por caída de corriente de rejilla de oscilador . GDO abierto, monstrando sus principales componentes. Contenido 1 …   Wikipedia Español

  • equipment — Synonyms and related words: Lecher wires, RC oscillator, VOM, VTVM, ability, accessories, accouterment, accouterments, adaptation, adjustment, ammeter, anemometer, anemoscope, apparatus, appliances, appointments, appurtenances, armament,… …   Moby Thesaurus

  • Liste De Sigles — {{{image}}} Sigles d une seule lettre Sigles de deux lettres Sigles de trois lettres AAA à DZZ EAA à HZZ IAA à LZZ MAA à PZZ QAA à TZZ UAA à XZZ YAA à ZZZ …   Wikipédia en Français

  • Liste de sigles — Sigles d’une seule lettre Sigles de deux lettres Sigles de trois lettres Sigles de quatre lettres Sigles de cinq lettres Sigles de six lettres Sigles de sept lettres Sigles de huit lettres Voici une liste des sigles ou acronymes courants. La… …   Wikipédia en Français

  • Liste des sigles — Liste de sigles {{{image}}} Sigles d une seule lettre Sigles de deux lettres Sigles de trois lettres AAA à DZZ EAA à HZZ IAA à LZZ MAA à PZZ QAA à TZZ UAA à XZZ YAA à ZZZ …   Wikipédia en Français

  • Sigle de 7 caractères — Liste de sigles {{{image}}} Sigles d une seule lettre Sigles de deux lettres Sigles de trois lettres AAA à DZZ EAA à HZZ IAA à LZZ MAA à PZZ QAA à TZZ UAA à XZZ YAA à ZZZ …   Wikipédia en Français

  • Dipper (disambiguation) — A Dipper is a passerine bird in the genus Cinclus Dipper can also refer to: A participant on the Barenaked Ladies hosted cruise, Ships and Dip Supporter of the Canadian New Democratic Party or, pluralized, the party itself Dipper (Chinese… …   Wikipedia

  • Absorption wavemeter — The Absorption wavemeter is a simple device for the measurement of radio frequency energy at different frequencies. The device can be used by the users of radio equipment to check the approximate frequency of a strong signal source, and also to… …   Wikipedia

  • GDO — is a three letter acronym (TLA) that could mean: *Garage door opener, a fictional piece of technology in the science fiction television show Stargate SG 1. *Grid dip oscillator, a radio frequency measuring instrument. *Green Day Online, GDO is… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”