 Complete the following phrase:  The P-19 shares many of the physical features of the previous P-15 radar, the P-19 is a high mobility radar and with the antenna mounted on the single truck Zil-131 with the electronic equipment contained in a second truck. The P-19 uses two open frame elliptical parabolic antenna accomplishing both transmission and reception, each antenna being fed by a single antenna feed in a similar fashion to the P-15. The radar can rapidly shift its frequency to one of four pre-set frequencies to avoid active interference with passive interference being removed by a coherent doppler filter. Azimuth was determined by mechanical scanning with an associated accompanying PRV-11 NATO reporting name Side Net used to determine elevation. A secondary radar for IFF is generally used in conjunction with the P-15, generally the 1L22 Parol. The armed forces of the Czech Republic described the P-19 as having outstanding mechanical parameters, simple maintece, overall reliability and multifunctionality. This evaluation was mirrored by a French evaluation of a radar captured in Chad in 1987 during the 