A music-based "more tracks, less talk" format aimed at the over-40s will be broadcast by The Coast for a month on the frequency left vacant by the Talk 107 station.
The move by Celador Radio Broadcasting – part of the Celador group which injected 7 million into Slumdog Millionaire – is aimed at convincing Ofcom, the media regulator, that the group should win the franchise permanently.
Paul Smith, Celador founder, said: "It is a privilege to be broadcasting in Scotland.
"My great passion is for radio above all else and we hope that we will soon be able to make a bid to provide a permanent service for Edinburgh."
The new station would be in competition with Radio 2 and Radio Scotland for listeners in the Edinburgh area.
A spokesman for Ofcom said the regulator could not comment.