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US 4,361,804 AGranted
Electrical test instruments
AssigneeMarconi Instruments Limited
InventorVictor F. Arnold
Life of this patent
Estimating the term…
Abstract
A combined frequency and modulation measuring instrument contains a frequency counter which provides a direct indication of a carrier frequency and which is used to control the frequency of a local oscillator by means of which a modulated carrier frequency is converted directly to a required intermediate frequency.
Claims8
An electrical test instrument including means for receiving a modulated carrier signal;
- a frequency counter for determining the carrier frequency;
- means responsive to said frequency counter for generating a signal which when combined with said received carrier signal produces a further modulated signal having a predetermined intermediate frequency;
- and means for measuring the modulation of said further modulated signal.
Dependencies are inferred from the claim text.