Hi Ron, I have the same problem.  I haven't tried my own idea 
yet, but I would recommend locating the transmitter farther away 
from your computer speakers and use a long coax feedline to 
connect it to your computer.  Also, you could try rapping the 
audio feedline through some of those fehrite loops that will 
filter out RF.  Sorry I can't find the right spelling of fehrite 
in my spell checker.  I think if you get the transmitter 15 to 20 
feet away from your computer it should not interfere with the 
computer speakers which are notoriously good at picking up RF.  I 
get hum in my computer speakers from my VHF antenna mounted 
probably 35 to 45 feet away up in the clear when I transmit using 
high power on my Kenwood TMV71A.  73, Jim

 ----- Original Message -----
From: Ron Canazzi <[log in to unmask]
To: [log in to unmask]
Date sent: Mon, 11 Mar 2013 02:05:18 -0400
Subject: FM Transmitter Issues And Questions

    Hi list,

Since this is one of the lists where I got information about an 
FM
transmitter for feeding audio from my computer to FM receivers 
through out
my house and property, I thought I would inquire here again.

I have purchased the Sansonic FM transmitter that someone 
referenced on this
list a few months ago.  It does a real nice job with meeting my 
requirements
of clear and clean signals through out my property.  However, I 
have run
into one problem.  I have the transmitter fairly close to the 
computer from
which I am running the audio.  It is about 4 feet away from the 
computer.  I
am getting a pulsating hum through the computer speakers when the
transmitter is operating.  The transmitter runs from 1 to 7 
watts.  In light
of the issue, I don't dare put the power any higher than 1 
watt--and I
really don't need to anyway.

What can I do to solve this problem?  Any help would be greatly 
appreciated.