The "Pegmantit 8" or P-8 (also referred to by the NATO reporting name "Knife Rest A" in the west) was an early 2D VHF radar developed and operated by the former Soviet Union.

The P-8 was developed by the SKB Design Bureau, a division of State Plant No.197 named after V. I. Lenin who developed the previous P-3, the predecessor of the current Nizhniy Novgorod Research Institute of Radio Engineering (NNIIRT).

[2] The development of the P-8 radar won the team responsible for its introduction the state prize.

[4] Azimuth was scanned mechanically by the antenna with elevation determined using a goniometer in similar fashion to the P-3.

[4] The P-8 was one of the first Russian radars to incorporate a means of clutter suppression,[2] a coherent oscillator in the receiver circuit acted as a simple moving target indicator to eliminate passive interference like ground clutter.