[Amps] Amplifier Fans:

[Mark Robinson]

You didn't have to trash it. I had a 5V psu which came with a laptop cooler 
that was really bad. I could hear it on a dipole over 100 feet from the 
house. 12 turns of the 5V side around a clamp on ferrite and it was as quiet 
as a mouse....it took 12 turns, so you know that the noise was bad.


Mark N1UK


----- Original Message ----- 
From: "Bruce Osterberg" <n9bx at mchsi.com>
To: <amps at contesting.com>
Sent: Saturday, 25 August, 2012 4:38 PM
Subject: Re: [Amps] Amplifier Fans:


> Problem Solved:
>
> As you all have suggested it was the Switching Power Supply.  It now has
> a Home in the Trash.  Hooked my 12 Volts to the Main Astron Power supply
> and Noise is Gone.
>
> Thanks All
>
> Bruce N9BX 73
>
> On 8/25/2012 1:33 PM, Bruce Osterberg wrote:
>>
>> Hello:  I have Built a W6PO amplifier in a 30 Inch rack cabinet, along
>> with it's power supply,(pictures available upon request.)  But I thought
>> I would add some internal fans on the inside to help cool the
>> transformer and exhaust a bit more air.  Well that turned out OK except
>> for the Noise, (electrical that the Fans Produce.)
>>
>> With out the Fans on the noise level on the K3 is right at S1 all the
>> time.  Once the Fans are on it goes up to S5 and Stays there.  Mind you
>> these are cheap Ham fest fans, but I don't know if adding anything to
>> them would cut down on the Electrical Noise Generated.  But then as I
>> think of it I may have a Problem with the Switching Power supply from
>> China that I am using to provide power to the Fans.  That's easier to
>> check.  But if it's the Fans, is there a solution to this delima?
>>
>> 73 Bruce N9BX
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