COIL PULSERS FOR RADAR 



60S 



The two larger coils shown are used in jxiwer pulsers. Their cores are 

 made up of self-supporting rings. 'J1ic smaller coil has a core weight of one 

 kilogram and is used at voltages up to 25 kv. for the generation of power 

 peaks of the order of 100-250 kw. Phenol fibre is used to support and 

 position the core and winding. The larger core has a weight of 13 kg. and 

 is used at a voltage of 40 kv. in a pulser generating power peaks, of one 

 megawatt. Glass-bonded mica and built-up mica are used for support and 



Fig. 1 — Non-linear ceils used in various radar transmitters. The smallest coil at the 

 left, seen in front of its container, is used for low power pulse generation. The two larger 

 coils are used in power pulsers developing 200 KW and 1000 KW peaks, respectively. 

 The core rings of molybdenum permalloy tape are assembled into the coils shown. 



positioning of the core rings and windings. The coils are assembled with 

 other passive elements of the pulser network and the whole immersed in oil. 

 Operating principles of the two types of pulser circuits in which these 

 coils are used are now to be discussed. 



T.ow-Lkvki. Pui.ser 



A schematic of the circuit used for (level()i)ing low-power i)ulses is shown 

 in Fig. 2a. Sinusoidal driving current (/i) is introduced from the left, and a 

 sharply peaked wave (/2) is dcveloi)ed in the right-hand mesh. A resonant 

 circuit (/-iCi) sers'es to i)revcnt dissipation of the generated pulse in the 

 input mesh, and to tune out the input reactance at the driving frequency. 



