A fuzzy picture can be due to a low quality or defective Camera or due to the loss that is incurred in transmission over the Coaxial or Twisted Pair cable connecting the Camera to the Recorder. Assuming that you have tested the camera and the picture at the Camera location is satisfactory, then the probable answer is that the coaxial cable or the Twisted Pair transmission system is long enough to cause high frequency loss that degrades the picture quality.