P80 controller described a loss of separation event between an aircraft holding at ugb VOR and an IF...

Narrative:

A C172 was in a published holding pattern at the ubg VOR. A C414 was a departure from uao airport; approximately 8 miles east of the ubg VOR. Limited departure routes from uao; most being routed over ubg. Normally; with a good performing airplane; you are able to establish radar contact around 2;000 from uao (the newberg sector is both radar and non-radar; given the location of our single radar sensor); but did not see the C414 until approximately 5 miles west of uao. [I] turned the C414 immediately to avoid the C172. Thought I had cleared the traffic; but tarp thought otherwise. I believe it happened due to our poor radar coverage; and poor climb performance of the C414. There are things I could have done also; such as climb the C414 to 3;000. The problem with that however; would be the fact that I would possibly never see C414 on radar; because our coverage gets much worse the farther you venture west. Simple answer is: we need another radar installation to cover the entire southwest quadrant of our airspace. This airspace contains 80 percent of our student pilot; instrument training airports. There have been several issues over the years with this airspace; and lack of radar coverage.

Original NASA ASRS Text

Title: P80 Controller described a loss of separation event between an aircraft holding at UGB VOR and an IFR UAO departure. The reporter suggested improved RADAR coverage is a must in this area.

Narrative: A C172 was in a published holding pattern at the UBG VOR. A C414 was a departure from UAO airport; approximately 8 miles east of the UBG VOR. Limited departure routes from UAO; most being routed over UBG. Normally; with a good performing airplane; you are able to establish RADAR contact around 2;000 from UAO (the Newberg Sector is both RADAR and non-RADAR; given the location of our single RADAR sensor); but did not see the C414 until approximately 5 miles west of UAO. [I] turned the C414 immediately to avoid the C172. Thought I had cleared the traffic; but TARP thought otherwise. I believe it happened due to our poor RADAR coverage; and poor climb performance of the C414. There are things I could have done also; such as climb the C414 to 3;000. The problem with that however; would be the fact that I would possibly never see C414 on RADAR; because our coverage gets much worse the farther you venture west. Simple answer is: We need another RADAR installation to cover the entire southwest quadrant of our airspace. This airspace contains 80 percent of our student pilot; instrument training airports. There have been several issues over the years with this airspace; and lack of RADAR coverage.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1026198
Time
Date	201207
Local Time Of Day	1801-2400
Place
Locale Reference	UAO.Airport
State Reference	OR
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Chancellor 414A / C414
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Departure Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

P80 controller described a loss of separation event between an aircraft holding at ugb VOR and an IFR uao departure. The reporter suggested improved radar coverage is a must in this area.