Apparatus for generating signals useful for testing the sensitivity of microwave receiving equipment

Patent 4742561 Issued on May 3, 1988. Estimated Expiration Date:

September 10, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3731186

3896385

Critical parameter receiver tester
Patent #: 4004230
Issued on: 01/18/1977
Inventor: Campbell

System for establishing signal level for transmission of a CATV cable
Patent #: 4023104
Issued on: 05/10/1977
Inventor: Rheinfelder

In-service technique for measuring transmission characteristics of a microwave radio link
Patent #: 4025854
Issued on: 05/24/1977
Inventor: Oades

Broad band microwave receiver gain calibrator
Patent #: 4048567
Issued on: 09/13/1977
Inventor: Johnson , et al.

Signal analyzer with noise estimation and signal to noise readout
Patent #: 4074201
Issued on: 02/14/1978
Inventor: Lennon

Random state generator
Patent #: 4095192
Issued on: 06/13/1978
Inventor: Atkinson, et al.

Digital C/kT meter
Patent #: 4125809
Issued on: 11/14/1978
Inventor: Mott

Statistical calibration system
Patent #: 4328552
Issued on: 05/04/1982
Inventor: Stovall

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Inventor

Tipton, M. Scott

Application

No. 06/774324 filed on 09/10/1985

US Classes:

455/67.12, Using a chamber (e.g., room testing or audio surveillance, etc.)324/614, Signal to noise ratio or noise figure342/168, With noise generation455/226.1, Measuring or testing of receiver455/226.4With meter or indicator

Examiners

Primary: Griffin, Robert L.
Assistant: Kuntz, Curtis

Attorney, Agent or Firm

Kennard; Wayne M.

International Classes

G01R 29/00 (20060101)
G01R 29/26 (20060101)
G01R 35/00 (20060101)

Abstract

The present invention is an apparatus for generating a signal for use in testing the purported sensitivity of a microwave receiving equipment having a noise source (105, 106) for generating a noise signal, first (112), second (114), and third (118) stage microamplifiers connected in series with an attenuator (116) for amplification and adjustment of the power level of the noise signal, a first splitter (120) connected to the output of the third stage amplifier (118), a first power meter (124) connected to a first output of the first splitter (120), a second splitter (130) receiving at its input a microwave carrier signal (127) having a specific power level, a second power meter (134) connected to a first output of the second splitter (132) and a combiner (138) connected to the second outputs of the first and second splitters (120, 130) which provides an output test signal for use in testing the carrier to noise of the microwave receiving equipment.

Other References

Beck, D. et al, "Fading Machine for the Simulation of the Ionosphere", 1965, pp. 74-79
"Avalanche Diodes as Transfer Noise Standards," pp. 133-135, Keen, 1971
"Measurement Parameters for Preventative Maintenance," Thomas, pp. 32-35, May 1977