| 摘要 |
A circuit arrangement for an electronic distance measuring device for drawing the frequency of a measuring oscillator towards a set point frequency which is higher or lower, respectively, by a certain predetermined amount or value than the frequency of a similar measuring oscillator at the counter station. From the measuring waves of both measuring oscillators there is produced at such circuit arrangement, by mixing, a differential signal. The circuitry of the invention also contains a discriminator circuit which compares the frequency of the differential signal with a reference frequency corresponding to the aforesaid predetermined amount and upon deviation of this differential signal from the reference frequency there is produced an error voltage for drawing or shifting the frequency of such measuring oscillator. |
