(1) 200sx is 30kHz, so you need a 15kHz to see anything.
(2) SynStrainer info from the Big Book of Amiga Hardware:
• allows the use of multisync monitors while the Amiga is in genlock mode
• in genlock mode the horizontal and vertical sync signals are set to 7.8 kHz on the Amiga video port - these signals are not used by single scan monitors, but are required for multiscan monitors
• when the Sync Strainer senses a genlock condition (as when the Video Toaster is started), it creates new H- and V-sync's from Composite sync
• acts as a simple buffer for H- and V-sync when the Amiga puts out 15.7 kHz or 31.4 kHz horizontal scan rate
• automatically switches between the various scan modes
• a 2" × 3" × 1/2" module which connects to the 23 pin RGB connector
• available with DB9 or DB15 VGA output connectors
• works with any genlock which does not use the 23 pin RGB port
• the Sync Strainer is not a scandoubler, the analog RGB signal is passed through unchanged
Nice to see some more questions, even if it is from a 2nd poster.