There isn't an internal fan on astron power supplies except maybe the 
switching ones.
----- Original Message ----- 
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 14, 2008 12:04 AM
Subject: Re: DC Power Supply Roar


> the internal fan.
> 73
> Colin, V A6BKX
> ----- Original Message ----- 
> From: "Steve Forst" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, October 13, 2008 9:56 PM
> Subject: Re: DC Power Supply Roar
>
>
>>
>> Bob,
>>
>> I've had an RS-20A for over 20 years and an RS-35A
>> for 7 years.  Both can be  noisy and there is a vibration  you can feel 
>> if
>> you touch the top cover.  I've found that just  moving it around  a bit
> can
>> reduce any noise, although I've never experienced the roar you describe.
>> They also both clunk pretty good when powered up.
>>
>> 73, Steve KW3A
>>
>> ----- Original Message ----- 
>> From: "Bob Martin" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Monday, October 13, 2008 8:13 PM
>> Subject: DC Power Supply Roar
>>
>>
>> > Earlier today, my almost new ASTRON 35 developed a really loud roar
> under
>> > load.  It had been on receive for 2 or 3 hours.  Then, At 5 Watts
> transmit
>> > on FM,  it was hardly noticed.  At about 40 Watts it is quite lout and
> at
>> > 100 continuous it can be heard throughout the entire basement. Just 
>> > now,
> I
>> > turned it on and went through the cycle noted above with no noise 
>> > heard.
>> > In
>> > stand-by I can't hear it at all now but when I was experiencing the
>> > problem,
>> > I could feel it vibrating ever so slightly.  Will try it before I turn
> in
>> > tonight.
>> >
>> > Any thoughts?
>> >
>> > 73
>> > Bob Martin
>> > KC3FI
>> >
>> >
>> > EchoLink Node - 55127
>> > Please visit http://www.wan-leatonks.net.
>> >
>>
>>
>> -- 
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>> 10/13/2008
> 7:50 AM
>>
>>