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