Electronic Military & Defense magazine was developed for engineers, program managers, project managers, and those involved in the design and development of electronic and electro-optic systems for military, defense, and aerospace applications.
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Techniques Electronic Military & Defense Annual Resource, 5th Edition 37 wherein the operator selects an RF frequency and the instrument stops at this frequency without sweeping its frequency converter. The detector now is responding to all signals within the IF bandwidth (otherwise known as the RBW) of the analyzer. The pulse is displayed versus time on the instru- ment display. The result is a display of RF power-versus-time just like an oscilloscope but with the increased dynamic range of the spectrum ana- lyzer available. In the zero-span mode, RF pulses are detected and shown as baseband pulses. The rise time capability of the zero-span mode is limited by the wid- est resolution filter available in the ana- lyzer's IF system. In the case of either a VSA or a real-time spectrum analyzer (RSA), which can digitize and store a wide frequency band in one capture, signal amplitude-versus-time can be displayed. This can show pulse rise time as fast as the full-capture band- width allows, and the spectrum display does not have the lines. For rise times faster than this bandwidth will support, an oscilloscope is recommended to accurately measure rise times of the pulses. Live RF spectrum displays are becoming increasingly available and are invaluable to radar measurements. These displays recreate the slow-fade memory effect of a CRT phosphor. For an RSA, the hardware processor performs several hundred FFTs per sec- ond. This gives continuous, real-time visibility of varying RF signals without interruption. The continuous, uninter- rupted visibility guarantees 100 percent probability of the intercept of signals or transients as short as a few µs, because there is no dead time — the live RF spectrum display is observing all the time. Interference to radar pulses and situations of multiple signals on the same frequency all can be discovered. Figure 4 shows a chirp that has a sec- ond lower power chirp overlapped in frequency, as well as several single- frequency pulsed carriers and two con- tinuous wave (CW) interferers. Example: Troubleshooting Incidental Modulation In this example, vector signal analysis software on an oscilloscope is used to measure a radar signal with errors in the transmitted signal. Since chirped pulse width is Lansdale Semiconductor still manufactures some of the most popular… and timeless commercial wireless, telecommunications, military and aerospace integrated circuits (ICs) classic designs. As a global pioneer in IC products life cycle management, Lansdale manufactures over 3,000 classic design ICs in the original package, exactly as they were created and produced by AMD, Fairchild, Freescale Semiconductor, Harris, Intel, Motorola, National, Philips (formerly Signetics), and Raytheon. Our exclusive life cycle management program assures you of a dependable, continuous, cost effective, and high quality source of classic designed ICs today… and tomorrow! This means Lansdale eliminates the need to go to the time or expense of designing in a replacement part or even doing a complete product redesign – not when we still make 'em… exactly like they used to. Log on to our Web site at www.lansdale.com to review our up-to-date product listings and data sheets. Contact Sandi@Lansdale.com today. 5245 South 39th Street Phoenix, AZ 85040-9008 3KRQH)D[ Classic Designs Are Timeless ® Just like the legendary Ford Built GT500 Mustang classic design… 1964 2014