Litton Systems, Inc.

Stanley J Gourse

Jacob Rozmaryn

Eugene Fischer

Dennis L Kershner

George A Harrison

A multichannel frequency phase variable signal source is described having particular application in the simulation of an emitter environment for testing interferometer receivers. An improved direct digital frequency synthesizer produces phase information for initiating the operation of a related frequency synthesizer at a different phase point from those of the remainder of the synthesizers forming the multi channel source. An improved direct digital frequency synthesizer is described for varying this phase information.

Multichannel frequency and phase variable radio frequency simulator

A wide band radio frequency measurement probe assembly is described for use in connection with circuits constructed of microstrip circuitry. The probe includes a resistive voltage divider connected to a microstrip transmission line enclosed in a hand held housing. Ground points for engagement with ground contacts on the probe are provided on the circuit board substrate and are plated through to a ground plane on the other side of the substrate.

Test probe and circuit board arrangement for the circuit under test for

A process and means for identifying erroneous frequency measurements made by an IFM receiver using a multi-channel delay line discriminator. Expected phase codes are compared with measured phase codes. An error signal is generated when the magnitude of deviation exceeds a predetermined amount. Preferred formulas are used to compute the expected phase codes and the deviation magnitude.

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Highland, MD, United States of America

Stanley J Gourse