It's the AN/APN-1 in the USAAC version. There is also a USN version with slight differences.
-John ============== > A widely used WW-II aircraft radio altimeter used a triangular waveform to > FM modulate a 400 MHz oscillator, employing a mechanical variable > capacitor > constructed similar to a permanent-magnet loudspeaker. To get the > capacitor's diaphragm to reverse accurately, at the positive peak of the > trianglular waveform, required a sharp, negative-going impulse to be added > to the > peak of the triangle, creating a sharp notch in the waveform about 30% > deep. > This makes me wonder about the limitations of speaker cones attempting > to > reproduce complex waveforms. If they had overall feedback for positional > correction, the spectrum of the resulting driving waveform might contain > some pretty complex components. > > Bruce Hunter > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
