2018Center Post forum
HD SDI signal loss through MK-V Nexus 2" post electronics while composite video works fine
What the thread found
- The MK-V V3 electronics have an RF interference issue affecting HD SDI signals traveling through unshielded connectors inside the post, particularly with 1.5GHz or 3GHz signals.
- The V3 to V3.5 upgrade adds internal connector shielding to resolve the HD SDI signal interference problem.
- V4 electronics introduced in 2012 feature redesigned internal cabling and additional SDI lines that eliminate the shielding issues present in V3 versions.
- Using a signal converter to transform HD to composite video allows the signal to pass through the post without loss as a workaround.
- The external appearance difference between V3 and V3.5 is minimal—only an engraving—making it important to verify the upgrade was actually performed internally.
Depends on
- The problem appears specific to the V3 electronics generation.
- The workaround using a converter device may introduce additional equipment into the signal chain.
- Users considering a used sled need to inspect internal modifications since external markings alone cannot confirm an upgrade was completed.
- The RF interference susceptibility depends on the presence of RF sources in the immediate working environment.