Narrative:

I was flying VFR down the hudson VFR corridor for personal sightseeing. I had taken off from teb and was receiving flight following and traffic advisories with teb tower while simultaneously listening and self-announcing on hudson VFR corridor unicom. However; in rush of frequency changes and rapid departure from teb had incorrectly entered 123.075 instead of 123.05 in my COM2. I did not notice that I was broadcasting position reports on the east river frequency as I also had teb tuned and the frequency was congested. I made all position reports on the wrong frequency for about 5 minutes. I was keeping a good look out; following all other rules of the corridor and monitoring my traffic advisory system closely. After turning 180 degrees around the statue of liberty and heading back northbound; I came within about 200-300 feet vertically and laterally of a helicopter. I saw him with plenty of time and turned to build more separation. With good visual tracking there was no real fear of collision (nor would we have come very close without avoidance) but it was closer than I would have liked. A few seconds later another airplane warned that I was on 123.075 instead of 123.05. I promptly switched frequency and started making calls on the correct frequency. I kicked myself for not looking at the tac chart more closely and will pay more attention in the future.

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Original NASA ASRS Text

Title: A light aircraft pilot reported using the wrong frequency for traffic advisories and then experiencing an NMAC in the Hudson River corridor.

Narrative: I was flying VFR down the Hudson VFR corridor for personal sightseeing. I had taken off from TEB and was receiving flight following and traffic advisories with TEB Tower while simultaneously listening and self-announcing on Hudson VFR corridor Unicom. However; in rush of frequency changes and rapid departure from TEB had incorrectly entered 123.075 instead of 123.05 in my COM2. I did not notice that I was broadcasting position reports on the East river frequency as I also had TEB tuned and the frequency was congested. I made all position reports on the wrong frequency for about 5 minutes. I was keeping a good look out; following all other rules of the corridor and monitoring my traffic advisory system closely. After turning 180 degrees around the Statue of Liberty and heading back northbound; I came within about 200-300 feet vertically and laterally of a helicopter. I saw him with plenty of time and turned to build more separation. With good visual tracking there was no real fear of collision (nor would we have come very close without avoidance) but it was closer than I would have liked. A few seconds later another airplane warned that I was on 123.075 instead of 123.05. I promptly switched frequency and started making calls on the correct frequency. I kicked myself for not looking at the TAC chart more closely and will pay more attention in the future.

Data retrieved from NASA's ASRS site as of April 2012 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.