Frequency converter for oscilloscope. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The frequency converter is made with a separate generator on Q1, its frequency is controlled by the oscilloscope sweep saw. The loop L1, C11 and the sweep voltage determine the frequency band to be analyzed. Circuit L2, C6 - filters out interference (L2 ~ 300 turns on K12 2000 NM). U1 - microcircuit MS174PS. To power the device, you must use a stabilized voltage.
(click to enlarge)
The gadget operates at frequencies up to 250MHz and is quite linear with output signals up to 2V. Usually I connect: INPUT - 10cm wiring or an external antenna (2 m pin with counterweights installed on the roof of a 5-story building), OUTPUT - input Y (closed), output from the generator - C1-73 (made it a tap from the output of the sweep generator ), sweep frequency - 5ms/div., . To control the range, I use a board with an LC7265 from an old car balalaika. It is convenient to use the lotion when setting up Spy transmitters, RF amplifiers, monitoring the presence of signals over the range, it can be used as an FM transmitter (instead of a saw - a tape recorder).
A frequency converter for an oscilloscope, it is more correct to call a frequency converter with a zero output IF. Zero beats allocated by the low-pass filter are formed in the same way when interacting with the local oscillator frequency located both above and below the frequency of the received signal. The error in determining the frequency of the received signal depends on the frequency tuning rate of the local oscillator and the bandwidth of the low-pass filter and can be quite large.
The scheme gives good results for rough estimates of the frequency and amplitude of the received signals. The circuit should work well in indicators of radio emissions used to detect, for example, radio microphones installed for eavesdropping.
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