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
----- Original Message ----- 
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 26, 2007 8:48 PM
Subject: using TS480 with 35-amp Samlex switching power supply


> Hi, all.
>
> I have noticed something when using my TS480 with my 35-amp Samlex 
> switching
> power supply.
>
> When I transmit with 100 watts, in CW mode or in RTTY mode using the stock
> mic, I notice a slight but audible hum coming from the switching power
> supply.  The hum stops when I stop transmitting.  I had my XYL take a look
> at the meters on the front of the supply, and they say I'm running at 13.8
> volts, and drawing about 19 amps, which is about what I'd expect.
>
> And, just for the record, I'm doing this with a resonant antenna, and just
> using the auto-tuner to be sure I have a perfect match.
>
> Is this slight but noticeable hum when transmitting normal?
>
> Thanks, and 73 from Tom Behler:  KB8TYJ
>
>
>