The minimum update interval for TR-102 is about 10 seconds. The user interface in GpsGate Server 1.3 will not allow you to set a faster update rate. However you can actually do it if you modify the database directly.
You need to set "time_filter" in the "track_recorder" table to 10 for the user in question.
(We will make it possible to set faster update intervals in the web interface in coming versions of GpsGate Server).
You can find the database schema of GpsGate Server 1.1 here
(There are more tables in GpsGate Server 1.3, we'll post that schema to the forum soon.)