Other

Raymond Marlow

John L Nelson

William M Robertson

Edward J Burke

A colored thermal joint compound consists of a mixture of a thermal joint compound and a powdered coloring agent of proportions sufficient to form a colloidal solution. The thermal joint compound is, for example, a zinc oxide in either a silicone oil or mineral oil base, and the coloring agent is, for example, a colored calcium carbonate powder of colloidal size particles.

Colored thermal joint compound

A radar system comprising an RF transmitter and receiver means for mounting in a moving carrier for transmitting RF energy and receiving RF energy returns and a non-rotating modulating radar reflector which has a lens means for focusing incident impinging RF energy onto a spot opposite the incident side and a plurality of solid state modulating radar reflectors positioned at the spot locations for selectively reflecting the RF energy and dissipating the RF energy for providing RF energy returns modulated with a lens identification code and frequencies for determining true ground speed, range, glide slope, and azimuth position. The solid state modulating radar reflector including a microwave section having open back and front ends, a load resistive means at the back end, a PIN diode adjacent to the load resistive means and a modulating power source for modulating the PIN diode to provide at preselected intervals virtual shorts at the open end of the wave guide for reflecting modulated RF energy returns directly to the source of RF energy.

Radar system

A ground speed determining radar system for take off roll and landings and roll out maneuvers has a ground based modulating radar reflector and a carrier based radar. The radar transmits microwave energy to the reflector where it is modulated by rotating spaced reflectors and returned to the radar receiver. The receiver is a heterodyne receiver having a log IF stage and a fast time control (FTC) circuit for attenuating clutter and an acquisition loop circuit, lock-on circuit and tracking loop circuit. The acquisition loop circuit includes a center, gate, modulation bandpass filter, switch, acquisition sweep generator and gate generator; the lock-on circuit adds a delay line and a good data indicator to the loop acquisition circuit, and the track loop circuit includes early/late gates, early/late gate low pass filters, subtractor, integrator, the switch and gate generator. Prior to acquisition or upon loss of lock-on, the modulation band pass filter has zero output to the switch and the switch switches in the acquisition sweep generator and a ramp voltage is applied to the early/late gates. During the time the early/late gates are swept over the desired modulated frequency from the ground reflector the modulated band pass filter outputs a signal to the switch which switches in the integrator of the tracking loop. The lock-on circuit's delay means delays the modulation band pass output a time sufficient for the integrator to settle down and spurious noise to the disappear before activiting the data indicator. At times, the early/late gates are not centered on an echo return; thus more echo energy is in one (late) gate than in the other (early gate), for example. The subtractor outputs the difference to the integrator which output a dc voltage proportional to the range to the reflector. A differentiator and range indicator and the switch are connected to the integrator for receiving its dc output and, respectively, outputting velocity and range information and feed back to center the early/late gates on the echo.

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Rockwall, TX, United States of America

Raymond Marlow