ARTCC controller climbed a B737 through another B737 with less than standard separation. Controller says was working multiple frequencys and aircraft were stepping on each other's xmissions. Reporter feels cross coupling of frequencys would have prevented this.

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Attributes
ACN	345233
Time
Date	199608
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lal
State Reference	FL
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 2
ASRS Report	345233
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 25200 vertical : 1700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Numerous aircraft on different frequencys. It is common for controllers at ZMA to monitor and utilize multiple frequencys. This resulted in aircraft stepping on xmissions of aircraft on different frequency. Cross coupling technology is available which would have eliminated this problem. Separation was lost for 6 seconds. Had I been able to utilize my frequency more efficiently, the clrncs to provide standard IFR separation would have been issued earlier.

Original NASA ASRS Text

Title: ARTCC CTLR CLBED A B737 THROUGH ANOTHER B737 WITH LTSS. CTLR SAYS WAS WORKING MULTIPLE FREQS AND ACFT WERE STEPPING ON EACH OTHER'S XMISSIONS. RPTR FEELS CROSS COUPLING OF FREQS WOULD HAVE PREVENTED THIS.

Narrative: NUMEROUS ACFT ON DIFFERENT FREQS. IT IS COMMON FOR CTLRS AT ZMA TO MONITOR AND UTILIZE MULTIPLE FREQS. THIS RESULTED IN ACFT STEPPING ON XMISSIONS OF ACFT ON DIFFERENT FREQ. CROSS COUPLING TECHNOLOGY IS AVAILABLE WHICH WOULD HAVE ELIMINATED THIS PROB. SEPARATION WAS LOST FOR 6 SECONDS. HAD I BEEN ABLE TO UTILIZE MY FREQ MORE EFFICIENTLY, THE CLRNCS TO PROVIDE STANDARD IFR SEPARATION WOULD HAVE BEEN ISSUED EARLIER.

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.