if i use a sma plug rated at 50 ohms impedance and a coaxial cable rated at 50 ohms impedance, will the load impedance be 100 ohms, if the coaxial cable is connected to the sma plus?
I am planning to build a filter that will filter the harmonics produced by the crystal oscillator module, leaving a 100 mhz sinewave. I am trying to scale the normalized filter to the load impedance. I am trying to make sure the load impedance is 50 ohms. The output of the crystal oscillator module will travel through the filter, filtering the output. Then into a sma plug connected a coaxial cable serving as an antenna. Will the filter see a load of 50 ohms? I don't know how to connect the components of the filter together. So please don't ask for a schematic. Just trying to learn how to build a filter.You are getting very confused and heading off in the wrong direction. It still isn't clear exactly what you are trying to achieve.
Think of connectors and co-ax as being like water pipes and water fittings. If you have 15mm pipes you need 15mm joints between them. You can't fit a smaller or larger one without some blockage or leakage. Similarly, for 50 Ohm cable you use 50 Ohm connectors, you cannot simply add the numbers together, the connector becomes an integral part of the connection and the impedance stays the same.
Brian.
I am planning to use coaxial cables, because I want to make sure the load has a known impedance
So make the coaxial cable 1/4 of a wavelength long, then use the coaxial cable as an antenna?
So if I double antenna length of a monopole, I double the input impedance?
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