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Vintage HEWLETT PACKARD HP 537A Coaxial FREQUENCY METER 3.7 - 14.4 GHz Type N, US $570 – Picture 0
Vintage HEWLETT PACKARD HP 537A Coaxial FREQUENCY METER 3.7 - 14.4 GHz Type N, US $570 – Picture 0

Vintage Hewlett Packard Hp 537a Coaxial Frequency Meter 3.7 - 14.4 Ghz Type N

US $570

  • Marblehead, Massachusetts, United States
  • May 27th
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Vintage Hewlett Packard HP Model  537A Coaxial Frequency Meter, produced by Hewlett Packard right here in the US of A. Measures 3.7 to 14.4 GHz in 10 MHz increments with 0.170% Accuracy Type N (F-F) Clean and undamaged, with some wear and grime commensurate with age.  Smooth action across full range of adjustment. The HP 537A coaxial frequency meter is used for measuring frequency in the 3.7 to 14.4 GHz range. Accuracy is obtained from the spiral scale. The meter contains a coaxial line coupled to a quarter-wavelength coaxial resonant cavity loaded with capacitance at the bottom of the band. At resonance, power is absorbed by the cavity, producing a dip in the coaxial line power. The frequency at which this dip occurs is read directly from the dial in gigahertz. Tuning is accomplished by moving a piston. A precision lead screw, which is spring-loaded to prevent backlash, is used to position the piston in the cavity. Due to the design of the cavity, its electrical length is extended at lower frequencies, and there are no spurious modes.

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