dicky138hk

I really do not what's wrong to this Digiguard D0824, from AVTECH. I connect a total of 7 caremas only, 3 of them have about 250 meters long, other 4 have about 50-150meters long. However, only 5 cameras can view. 2 cameras with 250-280 meters long are not showing in this DVR. To prove the problem, I connect these 2 cameras directly to a LCD TV, and it works fine. I really do not have idea what happen to this brand. Anybody have idea please share with me. Thanks