VHF Frequency Meter FM-6

Wayne Kerr; New Malden, England

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  • Année
  • 1962 ?
  • Catégorie
  • Appareils de mesure et de dépannage (matériel de labo)
  • Radiomuseum.org ID
  • 335586

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 Spécifications techniques

  • Gammes d'ondes
  • Bandes en notes
  • Tension / type courant
  • Alimentation Courant Alternatif (CA)
  • Haut-parleur
  • - - Pas de sortie basse fréquence
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: VHF Frequency Meter FM-6 - Wayne Kerr; New Malden,
  • Forme
  • Modèle de table profil bas (grand modèle).
  • Remarques

  • A VHF frequency meter which converts easily into a frequency synthesizer 'locking up ' at
    10kHz intervals. Accuracy of the instrument is better than ±0.00001% when used with a 100MHz counter. It is a harmonic instrument with a fundamental frequency range 20 to 40MHz. The conservative upper limit for both measurement and generation is 1,000MHz, but measurements have been recorded as high as 2,400MHz.  Basic accuracy of the instrument is determined by a precise, hermetically sealed 1MHz crystal. The unit is converted to a frequency synthesizer by operating an externally mounted switch. In this form the low frequency oscillator operates as a divide-by-two stage. The 100kHz derived from the 1MHz timebase feeds into this stage, producing a 50kHz signal instead of the 40 to 50kHz variable frequency. Frequency stability and accuracy closely approach the internal 1MHz time-base or any other time-base that is used. When used in its primary form as a frequency meter, its basic circuit is simple. A heterodyne frequency meter consists of an output/input stage, beat detector, HF oscillator and buffer, and an amplifier with aural and visual detectors. Unknown signals are fed into the beat detector and compared against the fundamental or harmonic output of the HF oscillator and buffer. The resultant beat is amplified and zero is detected by means of visual and aural presentations. The HF oscillator dial is calibrated in 1MHz increments and a means of interpolating between these points provides a reading accuracy of one part per million.

  • Littérature
  • Electronic Engineering, volume 34 year 1962, September.
  • Auteur
  • Modèle crée par Pier Antonio Aluffi. Voir les propositions de modification pour les contributeurs supplémentaires.

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