Re: Filter recommendation for DC fan motor interference to echo Link.
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You could try about a 10 ohm resistor, with a >2000 uf cap on both sides to ground (A pi network).?? Better yet, use a toroid instead of a resistor with a lot of windings.??
Good news is that the noise is rather high in frequency, so it is easy to eliminate.
I have not ever had to resort to buying a specific fan to remove the noise.?? It always works with a filter.
Put a scope on it to verify that noise is indeed being induced on the DC line.???
Andy Zorca WJ9J
On Sun, Apr 27, 2025 at 12:48?PM Chad Nelson via <chad.nelson71= [email protected]> wrote: Hi everyone, I just installed a small DC fan to cool my Link radio and notice when echo Link is active I get a wine on the signal going into the controller for my echo link. Don't get this when repeater is transmiting on its own. Any good filter recommendations to eliminate? this out?
Chad Nelson WI9HF/WRPL979
Janesville Wisconsin
608-754-8671
Send from my spectrum iPhone 16.
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