Narrative:

I was on the ground holding short of runway 24 at palomar airport (crq) and called tower to request a right downwind departure on runway 24 for my VFR flight north. I received clearance for a right downwind departure on runway 24 and acknowledged this clearance and rolled onto the runway and took off. I heard static and poor quality radio transmissions whilst I was upwind on 24 and turning crosswind and eventually downwind. I reported this but still received only static on my radio. Finally; while I was abeam midfield on right downwind; an audible call came through which asked me to turn southbound immediately; I copied this ATC instruction and turned south. I saw the traffic; a citation jet; whilst turning to the south and maintained visual separation. The pilot of the citation announced that they were in a RA climb and that they had me in sight. The near miss was resolved at the moment when I began my evasive turn southbound and when the jet began to climb to a higher attitude. I later learned after calling the tower upon the completion of my flight and listening to the ATC recordings online that during my climb into the right pattern for runway 24 that the static and inaudible transmissions that I couldn't hear was when the citation jet called in to announce their position and the controller asking them to enter right downwind for runway 24 as they were inbound. Tower asked me; after establishing contact with the citation; to make a left downwind departure instead and that the controller would call my northbound turn. Ultimately; I believe that this incident would have been averted if two way radio communications were able to be established during my takeoff roll or even the initial climb out whilst still on upwind. Therefore; it is my view that it was the momentary radio malfunction which put my aircraft in such close proximity to the citation jet.

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Original NASA ASRS Text

Title: DA40 pilot on a right downwind departure experiences a NMAC with a Citation jet joining the right downwind at the Tower Controllers direction. The Tower's initial instructions to the reporter had been changed to a left downwind during takeoff but were heard as static on the reporters radio.

Narrative: I was on the ground holding short of Runway 24 at Palomar Airport (CRQ) and called Tower to request a right downwind departure on Runway 24 for my VFR flight north. I received clearance for a right downwind departure on Runway 24 and acknowledged this clearance and rolled onto the runway and took off. I heard static and poor quality radio transmissions whilst I was upwind on 24 and turning crosswind and eventually downwind. I reported this but still received only static on my radio. Finally; while I was abeam midfield on right downwind; an audible call came through which asked me to turn southbound immediately; I copied this ATC instruction and turned south. I saw the traffic; a Citation jet; whilst turning to the south and maintained visual separation. The pilot of the Citation announced that they were in a RA climb and that they had me in sight. The near miss was resolved at the moment when I began my evasive turn southbound and when the jet began to climb to a higher attitude. I later learned after calling the Tower upon the completion of my flight and listening to the ATC recordings online that during my climb into the right pattern for Runway 24 that the static and inaudible transmissions that I couldn't hear was when the Citation jet called in to announce their position and the Controller asking them to enter right downwind for Runway 24 as they were inbound. Tower asked me; after establishing contact with the Citation; to make a left downwind departure instead and that the Controller would call my northbound turn. Ultimately; I believe that this incident would have been averted if two way radio communications were able to be established during my takeoff roll or even the initial climb out whilst still on upwind. Therefore; it is my view that it was the momentary radio malfunction which put my aircraft in such close proximity to the Citation jet.

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.