Mpv and tan have cochannel interference on ASOS frequency of 132.67.

Attributes
ACN	515609
Time
Date	200106
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mpv.airport
State Reference	VT
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zbw.artcc artcc : ztl.artcc
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	other
Function	observation : passenger
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 10 flight time total : 1500 flight time type : 100
ASRS Report	515609
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted other
Supplementary
Problem Areas	FAA ATC Facility
Situations
ATC Facility	communication equipment : mpv.comrdo

Narrative:

There is a ASOS frequency spillover/conflict. We were attempting to get local airport information while descending to land at kmpv (barre/mountpelier vt).while only 20 NM south (coming from bos area), down through 10000 ft MSL. We were still receiving taunton, ma ASOS information. Both frqs are 132.675. Tauntom (ktan) is 150 NM south of kmpv! VFR was ok but not great. Kmpv is uncontrolled field. Terrain to north plus our speed/AC type dictates planning the approach descent properly depending on local wind/runways in use. For some reason, the ASOS information at mpv was overpowered by taunton even though we were 20 NM from kmpv and 130 NM from ktan. This would be a problem if flying conditions were worse and IFR approach needed to be selected ahead of time. Also, 132.675 has been in place at kmpv for some yrs, ktan's is more recent. Please turn down the power at ktan!

Original NASA ASRS Text

Title: MPV AND TAN HAVE COCHANNEL INTERFERENCE ON ASOS FREQUENCY OF 132.67.

Narrative: THERE IS A ASOS FREQ SPILLOVER/CONFLICT. WE WERE ATTEMPTING TO GET LOCAL ARPT INFO WHILE DESCENDING TO LAND AT KMPV (BARRE/MOUNTPELIER VT).WHILE ONLY 20 NM S (COMING FROM BOS AREA), DOWN THROUGH 10000 FT MSL. WE WERE STILL RECEIVING TAUNTON, MA ASOS INFO. BOTH FRQS ARE 132.675. TAUNTOM (KTAN) IS 150 NM S OF KMPV! VFR WAS OK BUT NOT GREAT. KMPV IS UNCONTROLLED FIELD. TERRAIN TO N PLUS OUR SPEED/AC TYPE DICTATES PLANNING THE APCH DSCNT PROPERLY DEPENDING ON LOCAL WIND/RWYS IN USE. FOR SOME REASON, THE ASOS INFO AT MPV WAS OVERPOWERED BY TAUNTON EVEN THOUGH WE WERE 20 NM FROM KMPV AND 130 NM FROM KTAN. THIS WOULD BE A PROBLEM IF FLYING CONDITIONS WERE WORSE AND IFR APCH NEEDED TO BE SELECTED AHEAD OF TIME. ALSO, 132.675 HAS BEEN IN PLACE AT KMPV FOR SOME YRS, KTAN'S IS MORE RECENT. PLEASE TURN DOWN THE POWER AT KTAN!

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.