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Re: FAN NOISE BITX20

 

What kind of noise Ron?

Hash noise means you will need HF filtering. A bifilar choke + small value caps (like 10nF).
Hum means you will need magnetic shielding IMHO. Most of these fans I have seen have 3 coils on a PCB that are not shielded. I am sure the pulsating mag field extends right out of the fan at the center. Increasing the distance from your rig should reduce the noise, if this is so then you need a magnetic (iron) shield (a round plate) at the center of the fan.

Raj, vu2zap

At 27-05-2013, you wrote:


Bought a nice brushless silent geld fan,but was surprised to hear all the huge amount of noise in receiver. Best way to clear noise, Cap? What size? Thanks all techs Ron
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