If tower is active they will provide separation in their zone and hand you off to SY Radar 124.55 as you pass 2000.
If tower is not active you call SY Radar 124.55 when taxi-ing (I do it from the run-up bay) and they will give you code and known traffic. Call on CTAF 120.1 as well at taxi and when rolling. Departure call to SY Radar when airborne and on track.