What types of alpine races to you plan on timing? There are strict rules for wireless timing of scored ussa races. You need to comply with "Set-Up Diagram Level 3 (Without Cable)" which is described in the FIS timing booklet.
http://www.fis-ski.com/data/do...ingbooklet-v2_42.pdf
http://www.fis-ski.com/data/do...timingprecisions.pdf