Peter,
Most DC fans use a Hall Effect device to develop the commutating signal that
ultimately drives the fan. Many, and perhaps most, such fans are designed
to meet a price target, and their manufacturers devote very little effort
toward reducing or eliminating EMI. Other manufacturers, such as
At 08:02 PM 02/19/09, you wrote:
>Morning,
>I have a couple of M-10 radios run together with a 12VDC fan keeping
>them cool in the cabinet. However the power block has them all run into
>the same line fed by the power supply. You can hear the noise of the
>fan when you key the repeater. Would a fi
Having the DC fan get into the audio is a common problem for DC fans. It can
be eliminated with filtering but usually an easy fix is to run the fan from
another DC source, like a wall wort.
Ralph W4XE
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoo
Well I already cut the hole in the side of the cabinet so I guess its off to
rat shack for a AC fan. The DC one is just to noisy to be heard on the
machine. When in doubt modify right? Will the AC fan cut the noise I take it
after reading the passage on cooling Mike? I hope so as I want thins thing
I've made this same setup many times.
I usually mount a fan blowing directly on the TX radio.
I then put a 50 ohm 10 watt power resistor in the line to the fan with a 1000
uf capacitor 25 volt capacitor to ground on the fan side of the resistor.
This setup will take out most or all of the dc noise
Good Morning Peter --
Before I can suggest anything I need some more information. Is this a
Motorola repeater, in a cabinet with a motorola power supply? Are you using
a motorola RIC, basically - what is the configuration of the repeater?
I ask this because it has been well documented in the past
!
Thanks again!
Peter Summerhawk-N0WRE
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Rick Beatty
Sent: Friday, February 20, 2009 10:41 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Got some noise
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