MICROW.iVE RADAR TESTING 



437 



The more important types of tests required in radar work, either at radar 

 operating locations or at centralized service points, are: (1) Over-all Per- 

 formance (Range Capability), (2) Transmitter Power, (3) Receiver Sensi- 

 tivity, (4) Transmitter Frequency, (5) Transmitter Spectrum, (6) Standing 

 Wave Ratio, (7) R. F. Fnvelope, (8) Receiver Recovery, (9) AFC Tracking, 

 (10) I.F. Alignment, (11) Video Wave Shapes, (12) Range Calibration and 

 (13) Computer Calibration. 



The principal types of test sets required for carrying out the above are: 

 (1) Signal Generators, (2) Echo Boxes, (3) Frequency and Power Meters 

 (separate or combined), (4) Standing Wave Meters, (5) R.F. Loads, (6) 



Fig. 1 — Diagram of typical radar. 



Oscilloscopes, (7) Video Dividers and Loads, (8) Range Calibrators, (9) 

 Computer Test Sets and (10) Spectrum Analyzers. Various auxiliary test- 

 ing instruments are also employed, including vacuum tube testers, I.F. 

 signal generators, audio oscillators, flux meters, etc. Before discussing the 

 above tests and devices individually, some of the requirements for radar 

 test equipment, especially those resulting from military usage, will be 

 summarized. 



Generality of Application 



Radars perform a great variety of functions, including search and sur- 

 veillance, gun laying and fire control, bomb direction, and navigation. They 

 are used in the air, on shipboard, and on the ground, in attack and in de- 



