Every one of those units has that same problem.
Sent from my iPhone
On Aug 24, 2010, at 10:46 PM, Steve Dresser <[log in to unmask]> wrote:
> Tom,
>
> That hum is probably caused by vibration of the metal case. You may be able
> to fix it by pushing on the cover, or by removing the cover and putting it
> back on again. Then again, it may just remain the same. I wouldn't leave
> that padding underneath the supply; it's probably blocking air flow around
> the case, which may cause unwanted heat build-up, which will give you a far
> worse problem than the mechanical hum you're hearing. Of course, you could
> always mount the power supply on the outside of the motor home and drill
> holes for the wires. You wouldn't hear the hum, but you might not like the
> wind and other weather elements coming through the holes.
>
> Steve
>
>
> Steve
>
> ----- Original Message -----
> From: "tom behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, August 24, 2010 21:42
> Subject: Noisy Astron RS35 power supply
>
>
>> Hi, all.
>>
>> I don't know whether it's because of being jolted around in the move or
>> what, but my trusty metered Astron RS35 power supply seems noisier than it
>> used to be.
>>
>> It still works fine, but seems to have a louder hum than it used to have.
>>
>> I have it set up in exactly the same way I did out in Colorado, on the top
>> shelf of a sturdy ham operating desk. I even put some padding underneath
>> the supply, but it really didn't seem to do much.
>>
>> I suppose I could take the cover off, and try to feel around to see what
>> might have happened, but I know there are some electrolytic capacitors in
>> there that would not make for a pleasant experience if they were
>> accidentally discharged.
>>
>> If anyone has had this experience, and has any suggestions, please let me
>> know.
>>
>> Again, the supply still works fine; it just lets me know it's around more
>> than it used to. (smile)
>>
>> 73 from Tom Behler: KB8TYJ
>>
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