Radio laboratory handbook by Zennaro M.

By Zennaro M.

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The meter scale can be calibrated to show SWR directly when switched to sense the reflected component. In modern instruments the signal processing and display circuits compute and display the SWR. One of the most common SWR meters family is the “Bird” one. They provide an easy way to switch between frequency and power ranges by using different plug-in elements, also called “slugs”, which have an arrow over them to indicate the direction of the measured power. 7 GHz. There can be place for one or two slugs.

If you are not sure, adopt a safe setting. 4 GHz. Disable any modulation. If possible, disable the output of the generator (“RF OFF”). 2) Connect the power sensor to the power meter and calibrate them. 51 9 3) Connect the output of the signal generator to the input port of the directional coupler with a 50 Ω cable. 4) Connect the output port of the directional coupler to the 50 Ω € dummy load. € coupling 5) Connect another 50 Ω dummy load to the reflected signal port of the directional coupler.

The resultant value is the maximum possible value that can exist along a line, and it is useful in determining whether a particular line can operate safely with a given € SWR. 70 A SWR € It is very useful to relate the value of attenuation with the power lost along a line and with the values of voltage at the input and at the output of the line. We have A(power)=10 log10 Pout Pin A(voltage)=20 log10 Vout Vin € We can also use this equation to calculate the power that is going to be delivered to the load when we have€a certain power at the input and a certain value of attenuation.

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