Flight crew of a B737-200 at FL310 was advised by controller that they were 3 mi off centerline on J-75 southwest of mxe, PA. PIC reporter cites weak signal from a designated low altitude station at mxe.

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Attributes
ACN	389830
Time
Date	199712
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mxe
State Reference	PA
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise other
Route In Use	enroute airway : zdc enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	controller non radar : 2 controller radar : 2 flight time last 90 days : 200 flight time total : 11000 flight time type : 3000
ASRS Report	389830
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation
Situations
Navigational Aid	Unspecified

Narrative:

Weak VOR, low altitude station on J-75 used for high altitude navigation, wavering needle with unreliable signal. Showed on course but controller said 3 mi east of centerline.

Original NASA ASRS Text

Title: FLC OF A B737-200 AT FL310 WAS ADVISED BY CTLR THAT THEY WERE 3 MI OFF CTRLINE ON J-75 SW OF MXE, PA. PIC RPTR CITES WEAK SIGNAL FROM A DESIGNATED LOW ALT STATION AT MXE.

Narrative: WEAK VOR, LOW ALT STATION ON J-75 USED FOR HIGH ALT NAV, WAVERING NEEDLE WITH UNRELIABLE SIGNAL. SHOWED ON COURSE BUT CTLR SAID 3 MI E OF CTRLINE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.