It supports the 23.976, 24, and 25 frame rates in one package. Speed adjustment occurs through a small hole to prevent you from changing it accidentally. The Alarm setting tries to sync near zero, which is impossible for Bolex electronics and triggers the Sync Alarm. The STL-24 uses a temperature compensated crystal oscillator (TCXO) that remains consistent between -30C (-22F) and 75C (158F). Its frequency stability is ~2.5ppm, eliminating the need for calibration. The STL-24 includes ESD protection to prevent damage to the sensitive electronics on its circuit board.
A female 7-pin Amphenol-Tuchel port on the top & bottom. Customers from the European Bolex community requested this because it supports many cable options and simplifies repair if the cable gets damaged. The top port always connects to the Bolex camera or motor to keep sync (and typically draws power). An EBM requires power to be connected to the STL-24's bottom port. The STL-24's top port connects to the EBM's single 7-pin port. Power passes through the STL-24 to the EBM. The ESM supports this approach too even though it has two 7-pin ports instead of one. Do not connect power to the STL-24's bottom port when using an EL.
