Oooo. Just noticed you said this model doesn't have an analog input. That may be the key difference between the DCR-HC20 and 30.

If it did have an input, the jack is likely a 3.5mm headphone-type jack. The cable that turns this into composite RCA connectors probably came with the camera, or is available at RadioShack.
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-Rob Riccardelli
80GB 16MB MK2 090000736