Less than standard separation occurred between two aircraft.

Attributes
ACN	149539
Time
Date	199007
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sie
State Reference	NJ
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tower : srq
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	149539
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Even though large transport was on the frequency, I became unaware that I was talking to aircraft. Somehow I thought aircraft was on another frequency and when I realized I had talked to aircraft, I climbed aircraft to miss medium large transport.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION OCCURRED BETWEEN TWO ACFT.

Narrative: EVEN THOUGH LGT WAS ON THE FREQ, I BECAME UNAWARE THAT I WAS TALKING TO ACFT. SOMEHOW I THOUGHT ACFT WAS ON ANOTHER FREQ AND WHEN I REALIZED I HAD TALKED TO ACFT, I CLBED ACFT TO MISS MLG.

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.