Radio interference on ZID ARTCC frequency of 128 pt 8. Other frequencys clear.

Attributes
ACN	118471
Time
Date	198907
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : okk
State Reference	IN
Altitude	msl bound lower : 10000 msl bound upper : 13000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 3400 flight time type : 750
ASRS Report	118471
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

After establishing radio voice contact with ind ARTCC on frequency 128.8, interference from what seemed to be a public service radio transmitter began to occur. I distinctly heard the words 'dispatch' and 'street' in one transmission. There were several xmissions from this source as we climbed. It was not clear enough to understand all of the words to identify the source, but was a very strong carrier and quite active (busy). I informed ATC of the radio interference, was advised by ind ARTCC that interference may be due to WX conditions, and advised to contact ind ARTCC on frequency 134.6. After changing over to 134.6, assigned frequency, the radio interference was not noticed. My first officer advised me that this interference happens 'all the time' in that area and on 128.8. He had experience over that route for approximately 3 weeks, under varying WX conditions. This type of interference could easily be detrimental to the safety of aircraft flying north of ind.

Original NASA ASRS Text

Title: RADIO INTERFERENCE ON ZID ARTCC FREQ OF 128 PT 8. OTHER FREQS CLEAR.

Narrative: AFTER ESTABLISHING RADIO VOICE CONTACT WITH IND ARTCC ON FREQ 128.8, INTERFERENCE FROM WHAT SEEMED TO BE A PUBLIC SERVICE RADIO TRANSMITTER BEGAN TO OCCUR. I DISTINCTLY HEARD THE WORDS 'DISPATCH' AND 'STREET' IN ONE XMISSION. THERE WERE SEVERAL XMISSIONS FROM THIS SOURCE AS WE CLIMBED. IT WAS NOT CLEAR ENOUGH TO UNDERSTAND ALL OF THE WORDS TO IDENTIFY THE SOURCE, BUT WAS A VERY STRONG CARRIER AND QUITE ACTIVE (BUSY). I INFORMED ATC OF THE RADIO INTERFERENCE, WAS ADVISED BY IND ARTCC THAT INTERFERENCE MAY BE DUE TO WX CONDITIONS, AND ADVISED TO CONTACT IND ARTCC ON FREQ 134.6. AFTER CHANGING OVER TO 134.6, ASSIGNED FREQ, THE RADIO INTERFERENCE WAS NOT NOTICED. MY FIRST OFFICER ADVISED ME THAT THIS INTERFERENCE HAPPENS 'ALL THE TIME' IN THAT AREA AND ON 128.8. HE HAD EXPERIENCE OVER THAT ROUTE FOR APPROX 3 WEEKS, UNDER VARYING WX CONDITIONS. THIS TYPE OF INTERFERENCE COULD EASILY BE DETRIMENTAL TO THE SAFETY OF ACFT FLYING N OF IND.

Data retrieved from NASA's ASRS site as of August 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.