Try moving the transmitter and cables around a little.  Also try moving the 
speaker cables a little.
----- Original Message ----- 
From: "Ron Canazzi" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 11, 2013 12:05 AM
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.