Approach controller has intermittent receiver failures and claims it is an ongoing problem.

Attributes
ACN	232901
Time
Date	199302
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mke
State Reference	WI
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : mke
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 8
ASRS Report	232901
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
ATC Facility	other physical facility
Navigational Aid	Unspecified

Narrative:

At XX10 I terminated radar service with an aircraft and didn't hear an acknowledgement, but noticed the frequency modulating. I went to standby and back to main, which 'reset' the frequency. Between XX10 and XX25 I watched the frequencys for modulation and observed this on 3 additional frequencys without hearing a transmission. I was able to restore each frequency by changing to standby and then back to main. This is an ongoing problem.

Original NASA ASRS Text

Title: APCH CTLR HAS INTERMITTENT RECEIVER FAILURES AND CLAIMS IT IS AN ONGOING PROB.

Narrative: AT XX10 I TERMINATED RADAR SVC WITH AN ACFT AND DIDN'T HEAR AN ACKNOWLEDGEMENT, BUT NOTICED THE FREQ MODULATING. I WENT TO STANDBY AND BACK TO MAIN, WHICH 'RESET' THE FREQ. BTWN XX10 AND XX25 I WATCHED THE FREQS FOR MODULATION AND OBSERVED THIS ON 3 ADDITIONAL FREQS WITHOUT HEARING A XMISSION. I WAS ABLE TO RESTORE EACH FREQ BY CHANGING TO STANDBY AND THEN BACK TO MAIN. THIS IS AN ONGOING PROB.

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.