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Author Topic: RFI In my Samlex SEC 1223  (Read 21290 times)
K9BHP
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« Reply #15 on: October 09, 2014, 08:30:35 AM »

My SEC 1223 Power Supply came back today. Obviously Jim, ND6P, repaired it successfully. No more RF coming from inside the power supply and I have my 200 watts back. Jim definitely localized the problem correctly.
Thanks again Jim!

73
Ben
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K9BHP
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« Reply #16 on: October 09, 2014, 09:16:56 AM »

From Wikipedia:

Decoupling
One common kind of decoupling is of a powered circuit from signals in the power supply. Sometimes, for various reasons, a power supply supplies an AC signal superimposed on the DC power line. Such a signal is often undesirable in the powered circuit. A decoupling capacitor can prevent the powered circuit from seeing that signal, thus decoupling it from that aspect of the power supply circuit.

Another kind of decoupling is stopping a portion of a circuit from being affected by switching that happens in another portion. Switching in subcircuit A may cause fluctuations in the power supply or other electrical lines, but you do not want subcircuit B, which has nothing to do with that switching, to be affected. A decoupling capacitor can decouple subcircuits A and B so that B doesn't see any effects of the switching.

To decouple a subcircuit from AC signals or voltage spikes on a power supply or other line, a bypass capacitor is often used. A bypass capacitor is to shunt energy from those signals or transients past the subcircuit to be decoupled, right to the return path. For a power supply line, a bypass capacitor from the supply voltage line to the power supply return (neutral) would be used.

High frequencies and transient currents flow through a capacitor, in this case in preference to the harder path through the decoupled circuit, but DC cannot go through the capacitor, so continues on to the decoupled circuit.
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