"12 



HEI.I. SYSTEM I FA II MCA I. .101 R.\.\L 



ing into the input or grid cavity and is i)r()i)ortioned for operating out of a 

 5()-ohm im])edance cable connection to tiie radar antenna system. The 

 output coupHng is obtained from a coupling loop located in the region be- 

 tween the grid and i)late concentric sleeves. The gain of this RF amplifier 

 design is 12 db when operating at a frequency of approximately lOOO mc 

 and the noise tigure of this component is 14 db. 



2.14 The Radar duivcrter 



The basic converter is illustrated in l^'ig. 8 and may be defined as a device 

 which has two input pairs and one output pair of terminals and is charac- 



OUTPUT 



^'i^^ 7.- l()0()-mc Radio Frc(|iR'nc\ Aniplilicr. Siniplilicd schematic (iia,i,nam. 



tcrizc'l further by the property of (leli\ering an outjiul signal, which, in 

 terms of amplitude of one of the in])ut signals, is essentially linear but 

 which has an output frequency related to the sum or difference of the two 

 input frequencies. This frequency conversion is obtained by the use of an 

 element which has a nonlinear Noltage-current relationship and upon which 

 is impressed the two in[)ut signals. The desired sum or difference frequency 

 signal is then selected and utilized as the wanted signal output. 



The basic configuration of the coinerter shown in l'"ig. 8 employs a non- 

 linear element with network coupling means to ])rovide efBcient transfer ot 

 signal power into and out of the component and a beating oscillator with its 

 associated coupling network to suppK' the rc(|uire(l additional input tre- 



