A CL65 captain reports when transmitting on #2 communication to operations #1 communication tuned to a different frequency was blocked out. Recycling receive and transmit switch a few times cleared problem.

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Attributes
ACN	638378
Time
Date	200411
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : fll.airport
State Reference	FL
Altitude	msl single value : 11000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : mia.tracon tower : jef.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 260 flight time total : 6050 flight time type : 4600
ASRS Report	638378
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After departure from fll, communicating with ZMA, I called in our out and off times to fll operations at about 11000 ft (frequency 131.02). As I was transmitting on communication #2 to fll operations, I noticed that communication #1 was being blocked by my transmission. ZMA (132.45) was transmitting to other aircraft. I cycled my receive/transmit switch a few times to check to see if communication #2 was blocking communication #1 from receiving, which it was. I finished transmitting on communication #2. ZMA had not tried to communicate with us during my xmissions and communication #2. I feel a problem could arise if this situation causes radio xmissions to be blocked out and missed.

Original NASA ASRS Text

Title: A CL65 CAPT RPTS WHEN XMITTING ON #2 COM TO OPS #1 COM TUNED TO A DIFFERENT FREQ WAS BLOCKED OUT. RECYCLING RECEIVE AND XMIT SWITCH A FEW TIMES CLRED PROB.

Narrative: AFTER DEP FROM FLL, COMMUNICATING WITH ZMA, I CALLED IN OUR OUT AND OFF TIMES TO FLL OPS AT ABOUT 11000 FT (FREQ 131.02). AS I WAS XMITTING ON COM #2 TO FLL OPS, I NOTICED THAT COM #1 WAS BEING BLOCKED BY MY XMISSION. ZMA (132.45) WAS XMITTING TO OTHER ACFT. I CYCLED MY RECEIVE/XMIT SWITCH A FEW TIMES TO CHK TO SEE IF COM #2 WAS BLOCKING COM #1 FROM RECEIVING, WHICH IT WAS. I FINISHED XMITTING ON COM #2. ZMA HAD NOT TRIED TO COMMUNICATE WITH US DURING MY XMISSIONS AND COM #2. I FEEL A PROB COULD ARISE IF THIS SIT CAUSES RADIO XMISSIONS TO BE BLOCKED OUT AND MISSED.

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.