	US 7,592,816 B2
	Localizer cable fault analyzer
Steven William Edwards, Keller, Tex. (US)
Assigned to Federal Aviation Administration, Washington, D.C. (US)
Filed on Aug. 08, 2006, as Appl. No. 11/500,331.
Claims priority of provisional application 60/706758, filed on Aug. 10, 2005.
Prior Publication US 2009/0115662 A1, May 07, 2009
Int. Cl. G01R 31/08 (2006.01); G01R 31/02 (2006.01); H01Q 21/00 (2006.01); G01S 1/16 (2006.01)

U.S. Cl. 324—512 [324/539; 343/810; 342/413]

4 Claims

1. A cable fault analyzer having a plurality of detection and capture circuits coupled to a plurality of antennas in a Localizer antenna array, each said detection and capture circuit comprising:

a. A digital latch circuit comprising:

i. a first input,

ii. a second input coupled to a monitoring terminal on said Localizer antenna array, and

iii. an output;

b. A reset switch comprising:

i. a common terminal coupled to said first input of said latch circuit,

ii. a normally closed terminal coupled to a voltage source to apply a predetermined voltage to bias said latch circuit into a detection and capture mode, and

iii. a normally open terminal coupled to ground to apply ground to reset said latch circuit;

c. An indicator device coupled to said output of said latch circuit to signal the detection and capture of a fault in an antenna in said Localizer antenna array; and

d. A buffer circuit coupled between said second input on said latch circuit and said monitoring terminal on said Localizer antenna array.