Question about Yukon NVRS 26022T Weapon Sight

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Yukon NVRS not working-.

Hi, thank´s in advance for your help. NIGHT VISION SCOPE TITANIUM Model: 3x50 Serial Number: XXX Night vision riflescope gen 2+ , the NVRS 3X50. I installed it on a CZ 22 magnum rifle and zeroed the rifle without problems. The scope was never used on daylight and I always kept the scope objective lens closed when adjusting the scope on the rifle. After the sighting in session at the range, I returned home and tried it again at night but to my surprise, the scope phototube does not turn on. Only the red lighted reticle of the scope and the IR illuminator do turn on, and there´s no image at all. Checked the batteries and they where fresh, the objective lens cover open and the battery cap completely screwed down. There is absolutely no image on the scope, the green image does not turn on, even after 8 hours of the scope resting in my house to be sure it is not an humidity problem. Follow up: I purchased it new, it uses a 2+ tube. It worked perfectly the first 50 rounds of 22 magnum rimfire, then sudently it started to fail. The red hairs turn on, the IR iluminator turns on, but the tube is dark. Sometimes it works but the image appears as the tube was much less powerful. When I first tryed it start time was only 3 to 4 seconds. Now, when the tube works, it takes as long as 30 seconds. Changed batteries but the problem is the same. I really like the scope´s fit and finish, but something seems to be wrong with it. Returned it to Yukon for check, and the scope came back with a hand note inside the box which says the scope works fine.But I doesn´t! At Yukon nobody answers my calls or messages, nor they answer my e-mails.

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SOURCE: yukon 2.5 x50 nvrs tactical

Hello, don't worry about it. It is HV to the image intensifier tube. The battery voltage goes through control circuit then to ccfl inverter (here is were dc voltage is switch on and off and switch dc voltage is step up by toroid coil that has two input and only two out puts). By impulsing the coil with two different switch dc voltage on the input this make the current lag the two different phase voltage by 90 degrees. Here is where the strange noise is coming from. The toroid coil is encased in iron case and if half of this iron case is loose, it makes case vibrate so the noise.

Now, the voltage come out of the toroid coil is switching dc (one could call it AC because that what AC voltage is, it switch between positive to negative) this voltage is about 300 to 900 switching DC voltage. This voltage will be applied to a 1/2 wave voltage multiplier (this voltage multiplier with have anywhere four four stages to 10 stages depend on what the input voltage to multiplier is.

Low the voltage out of the ccfl inverter the more stages the multiplier will have.

Now, the voltage multiplier will double the voltage per stage to need image intensifier tube voltage of 12000 to 45000 volts---DC switching or AC what ever one wants to call it. This voltage will bit you but it doesn't have a lot current associated with it, the current would be in the 10 to 15 ua (micro-amps) 1/10X6 amps.

Now, you know. GB...stewbison

Posted on Sep 24, 2011

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