How much value is needed to block RF signals!?

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How much attenuation (in dB) can be regarded as "blocking" in your opinion? Why?
Did you check which reactance amount can be achieved with available components (e.g. by reading a datasheet)?
 

Yes, but you didn't specify how much "blocking" would be required. I guess, you didn't even think about, if a choke is required at all,
if the existing series resistor can provide sufficient attenuation of RF, or if and why a certain RF level can be expected as problematic
for the circuit. You actually know very little about the said circuit.

50k inductive reactance at 80 MHz is ridiculous...
 

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