Main 1 and Main are not SDI outputs, they are composite analog video outputs. SDI out is labeled Serial D1 on the Kudos NRS 50 and SDI on the NRS 70. From what I have been able to determine, I do not think the NRS 30 has a SDI out. But it is a TBC with a Frame Sync, which is what you need for VHS transfers.
You can take the SVideo (better than Composite) or component (best) output and connect it to a BM Analog to SDI Mini Converter HD model, to get a SDI out, and it will embed the audio for you also. That said, adding a small mixer or line level preamp, like a Sound Devices MicPre, between your VCR source and the Mini Converter will give you better control over audio levels.
The Kudos filtering on the NRS30 is a full-featured multi-standard format
interchange Timebase/Synchroniser incorporating
a powerful 2-stage noise reducer comprising a
non-linear adaptive recursive filter followed by a
unique spatial-temporal median filter. The median
filter has the ability to remove noise peaks without
introducing smearing artefacts and is ideally suited
to the suppressing of impulse noise originating
from film dirt or ‘sparklies’ prevalent in pictures
received via satellite sources.All recursive and
median noise reduction coefficients are adjustable
and a bargraph display shows the calculated noise
floor of the signal being processed so the adaption
threshold may be accurately set."
There are four settings for this filter, and they're described as follows:
The Median Filter switch selects the following filter
characteristics:-
1 Off
2 Luminance 5-point, 2 dimensional spatial
filter
3 Luminance 7-point, 2 dimensional spatial
filter (This setting has two configurations,
SYMMETRIC and ASYMMETRIC which
are selectable by a DIP switch on the noise
reducer PCB.
See ‘Noise Reduction’ section)
4 As position 3, plus additional 7-point
filtering for the Chrominance channel.
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