On the few clear nights, at 0:15z 12/30/96 with binoculars, at n42 02.184 w91 40.337 18822 88006A DMSP B5D2-4 would go from mag 4 to 5 down to nothing then back gain in a period of 2 minutes. It went through 2 complete fades in the 7x35.>Unable to determine if its active and in control, unknown downlink. When listing an object in the subject I have trouble searching for anything but the above, to compare observations of same object. Some users are doing it as shown above. Easy to search! Same as the TLE! Is anyone using one of those cheap($300) image intensifiers for these obs? I've been shopping for one and wondered the disadvantages of various models.