Radio hiss. Power Supply?

I have a Sonido radio by Sangean. To listen to distant radio stations, I 
use my PC in the den, and pick up the signal from our bedroom. The 
signal is sent from the PC via a CCrane xmiter. Sometimes the signal is 
so noisy I have to put the radio on the floor flat on its back to get 
something decent. Last night I had this problem, but decided to take out 
the wall wart. Instantly, the noise went away and the program could 
easily be heard. When I listen to local stations, there is little noise. 
I suppose the wall wart as it at fault. Comments?

On Sun, 07 Apr 2013 10:03:21 -0700, "W. eWatson"
<wolftracks@invalid.com> wrote:

>I have a Sonido radio by Sangean. To listen to distant radio stations, I 
>use my PC in the den, and pick up the signal from our bedroom. The 
>signal is sent from the PC via a CCrane xmiter. Sometimes the signal is 
>so noisy I have to put the radio on the floor flat on its back to get 
>something decent. Last night I had this problem, but decided to take out 
>the wall wart. Instantly, the noise went away and the program could 
>easily be heard. When I listen to local stations, there is little noise. 
>I suppose the wall wart as it at fault. Comments?

Cheapy filter caps.  I had the same sort of problem with my
Soundbridge... fired it up on a lab supply, noise went away.  Bought a
new wallwart.
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
I love to cook with wine.     Sometimes I even put it in the food.

On 4/7/2013 1:03 PM, W. eWatson wrote:
> I have a Sonido radio by Sangean. To listen to distant radio stations, I
> use my PC in the den, and pick up the signal from our bedroom. The
> signal is sent from the PC via a CCrane xmiter. Sometimes the signal is
> so noisy I have to put the radio on the floor flat on its back to get
> something decent. Last night I had this problem, but decided to take out
> the wall wart. Instantly, the noise went away and the program could
> easily be heard. When I listen to local stations, there is little noise.
> I suppose the wall wart as it at fault. Comments?

Some wall warts contain cheap switch mode power supplies
notorious for electrical noise. You need a better power supply.

Ed