Having Trouble synching a video waveform generator with a visual cortex

Hi, i recently bought a second hand video waveform generator and I’m having a bit of trouble synching it with my visual cortex.
Ive hooked up the Waveform Generator to sync with the field sync on the Cortex ( the vertical sync) and this keep the low oscillation rate relatively synced, but docent seem to sync the high oscillation rates.

I suspect that the Waveform Generator is running slightly out of sync, there is still slight movement when synced with a low oscillation rate, and this movement is enough to completely un sync it at higher rates.

aka, im getting synced lines that slighty wiggle up and down when the Waveform Generator is running slowly, but it just turns into unsynced noise when its running faster.

Does anyone know any fixes for this problem? maybe theirs some setting I need to change on the back of the Waveform generator. Or might it just be that the second hand waveform generator is a lil busted, and if so is there anyway to fix it?

Thanks so much for the help!!

Is the module receiving sync from the Cortex over the 14 pin ribbon cable connection the CV/gate lines on the power bus (VWG does not use 14 pin sync, see below)? I’m not personally too familiar with the VWG but this is probably the best way to sync it. You can also use a patch cable to the sync input but in that case you’re only getting one sync at a time, but probably you want to keep horizontal sync when you’re trying to sync vertically and vice versa. Patching horizontal sync from the Cortex to the oscillator sync input will probably sort of work (at vertical oscillator frequencies) but will still scroll vertically unless you have the oscillator frequency tuned just so. Getting a sync cable from LZX or making a 14 pin ribbon cable is probably your best bet for using modules from the Visionary line (which I have no experience with, but I use a lot of Cadet modules that use the same sync connections)

The VWG syncs to Cortex via the power bus. Visual Cortex sends those syncs on the power bus, when the “HV Sync to power bus” switches are turned ON, on the rear of the module. Originally the Visionary series Video Sync Generator was used with VWG and synced it via the power bus. Cadet 1 will do it too.

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