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Decimator Design

MD-LX

SDI to HDMI and HDMI to SDI, both at once, with the 3G level A/B conversion that settles a surprising number of 'no signal' arguments.

Spec

I/O: 1 x HDMI and 1 x 3G-SDI in; 1 x HDMI and 1 x 3G-SDI out
Modes: Both directions at once, or either input to both outputs
SDI: 3G level A and B in and out, with A/B conversion
Formats: Up to 1080p60, 1080i, 720p, 625i50, 525i59.94
Power: Micro-USB, 5 V, under 2.5 W; supply included
Size: 60 x 74 x 23 mm

More converters and sync

Blackmagic Design

Micro Converter BiDirectional SDI/HDMI 3G

SDI to HDMI and HDMI to SDI at the same time, in a box small enough to lose in a cable bag.

Directions: SDI in to HDMI out, and HDMI in to SDI out, at once
Formats: SD and HD up to 1080p60, plus 2K DCI
Power: USB-C, 5 V, 2.5 W

SDI
HDMI
USB-C power

Blackmagic Design

Mini Converter Sync Generator

Black burst and tri-level sync for kit that wants to be told when a frame starts.

Outputs: 6 x reference, black burst or tri-level
Formats: 525i NTSC, 625i PAL, 720p, 1080i and 1080p (incl. PsF)
Input: None: it's the house reference, not a genlocked one

Reference
Genlock