By Joseph Carr
Explains the fundamentals of acting the checks and measurements utilized in fitting, proving the functionality, retaining, and troubleshooting radio-frequency structures. Carr, who has written prolifically on electronics and communications, comprises easy theories of measuring radio frequency in addition to attempt gear, set-ups, dimension tactics, and examining the implications. Engineers, technicians, novice radio buffs, or hobbyists may well locate the knowledge important.
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Additional resources for Practical Radio Frequency Test and Measurement
This line is called the pure resistance line and forms the reference for measurements made on the chart. 1 The SmithChart. 2 Pureresistanceline. 51 52 SMITH CHARTING THE RADIO FREQUENCYCIRCUIT The pure resistance line represents the situation where X - 0, and the impedance is therefore equal to the resistive component only. , Z o in transmission lines); for most microwave RF systems the system impedance is standardized at 50 f~. In order to normalize the actual impedance, divide it by the system impedance.
67 ohms, and for 75 ohm systems R -- 25 ohms. The resistors used in this circuit must be noninductive. This limits selection to carbon composition or metal film resistors. If higher power than 2-watts is needed, then each arm of the Y-network must be made from multiple resistors in series or parallel. 67 ohms and 25 ohms are not standard values, except perhaps in certain lines of 1% or less tolerance precision resistors. They can, however, be approximated using standard values. 67 ohms, and 27 ohms is used in place of 25 ohms.
Each quarter wavelength segment creates a 90 ~ phase shift, while the half wavelength produces a 180 ~ phase shift. When a quarter wavelength and half wavelength are combined, to form a three-quarter wavelength segment, the phase shift is 270 ~. 19 ' Rat-racecombiner/splitter. 2 Input Use 0~Splitter,--3 dB at Ports I and 2 180~Splitter, -3 dB, -90 ~at Port 1, and -270 ~ at Port 2 Port 3 Port 4 It is necessary to terminate all ports of the Rat-Race n e t w o r k in the system characteristic impedance, R o, w h e t h e r they are used or not.