In the radar under discussion this is achieved as follows. When the target pulse reaches an apparent range of ± of the Tx pulse a number of Tx pulse, the number being the zone count, are delayed by a time equivalent to Take our example above. When the range of the target reduces to -that is greater than the 4 zones, the delay is introduced into the Tx system. After 4 pulses the delay is transferred into the range gate generation system, and the target continues to be tracked. After the target has reached a range of , 4 zones minus , the delay is removed from the system. At that point the range is such that the zone counter will have been decremented by 1 and the apparent range will be , but with the target at a real range of 3 zones plus the apparent range. Obviously, for an opening target the zone counter will be incremented and the apparent range will be slightly more than .