Hi all
ALL the "video broadcasting" and not source, are always interlaced (PAL50/60 hz, NTSC 3.58-60 hz /4.43-50 hz, SECAM 50 hz)
Sources like: VCRs, TUNERs, VideoDisks, video DVDs and so , are ALL interlaced.
Ciao
EDIT- by the way . . . which brand/model genlock, have you?