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HDV in NTSC has one framerate: 29.97 (approximately - it's actually 30*1000/1001). Irrespective of the selected frame rate (60i, 30P, 24P) 60*1000/1001 fields will be written to tape every second. A separate audio recorder will record 48ksps (or 96 ksps or 192 ksps) irrespective of the selected frame rate. The camera and the recorder will each produce time code at the rate of 30 frames per second which slip relative to the video frames by the factor 1000/1001. Thus the only reason the recorder needs to know the camera frame rate is so that it (or an NLE using files from it) can reconcile time code with frame number for display and especially for file timestamping. Equally as important as the frame rate is whether it is drop frame or non drop frame. Not all NLEs can process all frame rates equally well. It is thus generally considered best to set timecode to 29.97ND when recording audio seprately with HDV. If experiment with recorder and NLE indicate ability to use DF and you prefer that then by all means have at it.
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