Abstract: A circuit arrangement for determining the distance of an aircraft from a VOR transmitter is connected with a VOR receiver which determines angular information of the VOR transmitter perpendicular to the radial position line with an accuracy of .alpha. degrees from one bearing shift to the next. The arrangement includes a pulse generator operable to produce counting pulses at a predetermined pulsing frequency of less than 1 Hz, preferably 0.95 Hz or 0.0549 Hz, and feeds the pulses to a counter. Apparatus responsive to a bearing shift applies the counting pulses to the counter and removes the counting pulses from the counter in response to the next bearing shift. A display is connected to the counter and calibrated in minutes for displaying the count to a pilot in order to indicate the flight time to the VOR transmitter at the airspeed employed in the measuring operation.

Abstract: An analyzer device for VOR navigational receivers utilizes a first receiver section in which the reference phase, transmitted in the form of a frequency modulation, is available in demodulated form as reference signal, and a second receiver section in which the rotational phase, depending upon the particular direction of the antenna pattern, occurs in the form of an amplitude modulated rotating signal. Angular information in the azimuthal plane is obtained from a comparison of the reference phase with the rotational phase. In one of the two receiver sections a demodulated signal is applied to a frequency multiplier having a multiplication factor k, which is selected as a whole number multiple (k = 360.n) or as a fraction (k = 360 : n) of 360.