Tom,

If you ever start to miss that hum, you might put the supply on top of an 
empty paint can, which would act as an acoustic amplifier.

Steve

----- Original Message ----- 
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 27, 2007 21:15
Subject: Re: using TS480 with 35-amp Samlex switching power supply


>    Steve and all:
>
> Well, I tried transmitting on various power levels, including 5 watts, and
> the hum was still there, although it was somewhat less noticeable on 5
> watts.  I also tried farther separating the power supply from the radio, 
> and
> plugging the power supply into another outlet, but the hum still 
> persisted.
> Again, the hum is not unbearable--it's just noticeable if you listen 
> closely
> when the rig is keyed.
>
> I'm starting to conclude that this is all normal for this type of power
> supply.  So, I tried the ultimate "low tech" solution of them all;  I put
> the supply on a computer mouse pad on my ham desk, and the noise almost
> became unnoticeable.  So, I think I'm just going to leave it that way for
> now.
>
> If the supply or radio ran hot, I'd re-think my strategy, but so far, 
> things
> run very very cool.
>
> 73 from Tom Behler:  KB8TYJ
>
>
> ----- Original Message ----- 
> From: "Steve Forst" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, December 26, 2007 10:31 PM
> Subject: Re: using TS480 with 35-amp Samlex switching power supply
>
>
>> Tom,
>>
>> I don't have one of these,  so can't comment on if it's normal or not. 
>> If
>> it's not  normal for this supply, perhaps you  are getting some RF into 
>> it
>> through the ac line cord.  If you feel like playing,  try reducing power
>> and
>> see what happens,  try seperating the rig and supply as far as possible,
>> or
>> perhaps a different outlet to see what happens.
>>
>>
>> Or maybe someone will tellyou it is normal for this supply  and you can
>> just
>> enjoy your new toys.
>>
>> 73, Steve
>
>
>
>