When you use night vision it is better to have binocular NODs aka dual tubes over a single PVS-14. The pros and cons of running duals over a monotube is for another day. While getting dedicated dual tubes is the best, sometimes that is not an option for some. In some instances, a unit or department may have a bunch of PVS-14s but not enough money to upgrade to dual tube night vision. So bridging two PVS-14s is a compromise but it works. While there are other bridges out on the market, TNVC just came out with their Powered Bridge Mount.
Thanks to my friend, I got a chance to check out the TNVC powered bridge mount up close. Most bridges simply connect two PVS-14s and allow you to mount them to a helmet so you can see through both PVS-14s. However, they are individually powered. What sets the TNVC Powered Bridge Mount apart from the rest is its ability to power the twin PVS-14’s using a single power source.
When you connect and mount the PVS-14s to the powered bridge mount you remove the AA battery in each unit. The PBM will not work for a PVS-14 with 2xAA battery box. It only works on single AA powered PVS-14. If you have the ones with dual AAs then you can send them into TNVC and have them swap out the battery box for a single AA battery box.
Once you install the battery insert, you can store the battery cap on the end of the insert.
The bridge has a centrally located AA compartment and a main power switch just above it.
Another feature that the PBM has over other bridges is the ability to run a battery pack like an ANVIS battery pack.
The PBM holds onto the PVS14s using a ring around the objective lens infinity focus lock ring and a screw fastened to the screw hole in the PVS-14.
One nice thing about the PBM is that it allows the PVS-14s to articulate and flip around the bridge. Articulating dual tubes has a lot of uses. You can flip one up so you can scan your environment in case you need to see visible light and colors or you can use a handheld thermal scope or camera.
Another benefit to articulating night vision is when you fold the mount upwards. See the pic below? This is a standard position of night vision in the stowed position. Wearing them like this gets tiring as it is further away from your helmet and acts like a lever pulling the helmet down onto your forehead.
Bringing them closer to the helmet is a significant improvement in comfort. You can actually feel an appreciable difference.
Here is my PVS-14 bridge and it is a simple no-frills design. While it allows two PVS-14s to be mounted, it does not have all the features like the TNVC PBM.
Be careful which mount you use with the TNVC PBM. I tried it with my Norotos AKA2 mount. And found that the screw for the left side PVS14 interferes with the forward adjustment knob on the AKA2 mount.
It prevents the left side PVS14 from folding all the way against the helmet.
Here is the same setup with a Wilcox mount and there are no issues here.
If you run the dual PVS-14s on a single onboard AA you get approximately 12 hours of use at room temperature. Run a remote battery pack and you get 50 hours of run time.
The TNVC PBM is a bit pricey at an MSRP of $789. There are other bridges out there for less. Some can fold like the PBM but none of them run a single power source like the TNVC PBM. For more information go to their website.
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