Sync Strike processes sync from a suitable RGB SCART source. Find the interface and matching enclosures for your RGB signal chain here.
The LM1881 extracts sync information, making RGB, C-Sync and separate V-Sync available for suitable downstream devices. RCA outputs provide separate audio access.
Sync Strike is not a scaler: the 15 kHz line frequency remains unchanged. An HD15 socket therefore does not automatically mean standard VGA. Check signal types, levels and power requirements.