Narrative:

After the preflight check I started the engine and taxied to the active runway 36. Prior to crossing runway 9-27 en route I stopped; looked and broadcast my intention to cross and back taxi on runway 9 on 122.8. I completed the back taxi and did my runup in the runup area at the end of runway 36. I again looked for landing traffic; called on unicom and entered runway 36.as I started my takeoff roll I noted a piper above and moving ahead of me. I wondered why he was there but figured it was someone being stupid or someone doing a go around. I stayed in ground effect until I could determine which way the piper would turn off the center-line of runway 36 then as he had pulled further ahead and to the left I turned right to the east gaining more separation.when I had climbed to 2;500 ft I pulled a chart from the backseat to double check the radio frequency. Then it hit me that I had been calling on the wrong frequency. Thus I had landed using an incorrect frequency on a weekend and had just reused it for this departure instead of the correct 122.7. The lesson I learned is to always recheck radio frequencies even though you have personally been the one who set them for an earlier flight.

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Original NASA ASRS Text

Title: A C-182 pilot who; inadvertently tuned to the wrong unicom frequency; was passed on his takeoff roll by a Piper making a go around.

Narrative: After the preflight check I started the engine and taxied to the active Runway 36. Prior to crossing Runway 9-27 en route I stopped; looked and broadcast my intention to cross and back taxi on Runway 9 on 122.8. I completed the back taxi and did my runup in the runup area at the end of Runway 36. I again looked for landing traffic; called on Unicom and entered Runway 36.As I started my takeoff roll I noted a Piper above and moving ahead of me. I wondered why he was there but figured it was someone being stupid or someone doing a go around. I stayed in ground effect until I could determine which way the Piper would turn off the center-line of Runway 36 then as he had pulled further ahead and to the left I turned right to the east gaining more separation.When I had climbed to 2;500 FT I pulled a chart from the backseat to double check the radio frequency. Then it hit me that I had been calling on the wrong frequency. Thus I had landed using an incorrect frequency on a weekend and had just reused it for this departure instead of the correct 122.7. The lesson I learned is to always recheck radio frequencies even though you have personally been the one who set them for an earlier flight.

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.