Do you use same supply for receiver and fan Ron ? If yes, try different supply means different transformer w/ bypass ac capacitor in the primary winding, and good voltage regulator for fan.
If still some hum, try to supply the fan using pure dc voltage and see the result, you may take some conclusions base on this simple experiment.
Just an idea Ron.
Sudarmanta - YC1DCN
Pa-kaspa-an layauw �
toggle quoted message
Show quoted text
-----Original Message-----
From: "ronbaechle" <ronbaechle@...>
Sender: BITX20@...
Date: Mon, 27 May 2013 21:38:35
To: <BITX20@...>
Reply-To: BITX20@...
Subject: [BITX20] Re: FAN NOISE BITX20
Tried three 470 parallel caps still sum hum.This is 3200 rpm fan. Any more ideas? Thanks Ron
--- In BITX20@..., "ronbaechle" <ronbaechle@...> wrote:
Tom I tried 100uf didn't work. I will try larger Thanks Ron
--- In BITX20@..., Tom Sevart <n2uhc@> 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
I put a nice large electrolytic cap across the terminals for the fan, but I don't remember how large it was.� I think it was probably a 1000 uF or something.� I don't think you'll go wrong with that size or larger.
�
Tom Sevart N2UHC
St. Paul, KS
