XVI CONTENTS 



7-3 Receiver Noise Figure 353 



7-4 Low-Noise Figure Devices for RF Amplification .... 356 



7-5 Mixers 357 



7-6 Coupling to the Mixer 361 



7-7 IF Amplifier Design 362 



7-8 Considerations of IF Preamplifier Design 368 



7-9 Overall Amplifier Gain 373 



7-10 Gain Variation and Gain Setting 375 



7-11 Bandwidth and Dynamic Response 375 



7-12 Sneak Circuits 377 



7-13 Considerations Relating to AGC Design 379 



7-14 Problems at High-Input Power Levels 380 



7-15 The Second Detector (Envelope Detector) 382 



7-16 Gating Circuits 386 



7-17 Pulse Stretching 387 



7-18 Connecting the Receiver to the Related Regulating and 



Tracking Circuits 388 



7-19 Angle Demodulation 389 



7-20 Some Problems in the Measurement of Receiver Character- 

 istics 390 



8 REGULATORY CIRCUITS 



8-1 The Need for Regulatory Circuits 394 



8-2 External and Internal Noise Inputs to the Radar System . 395 



8-3 Automatic Frequency Control 401 



8-4 Variation of Transmitter Frequency with Environmental 



Conditions 402 



8-5 Magnetron Pulling . . . . ' 403 



8-6 Static and Dynamic Accuracy Requirements 405 



8-7 Continuous-Correction AFC 407 



8-8 Limit-Activated AFC 412 



8-9 The Influences of Local Oscillator Characteristics . . . 413 



8-10 Relation to Receiver IF Characteristics 414 



8-11 Discriminator Design 414 



8-12 Instantaneous AFC 415 



8-13 Problems of Frequency Search and Acquisition .... 416 



8-14 Automatic Gain Control 416 



8-15 Linear Analysis of AGC Loops 419 



8-16 Static Regulation Requirements of AGC Loops .... 420 



8-17 Dynamic Regulation Requirements of AGC Loops . . . 422 



8-18 AGC Transfer Characteristic Design Considerations . . . 423 



8-19 The Modulation Transmission Requirement 424 



8-20 Design of an AGC Transfer Function 425 



