Radio hiss. Power Supply?

[W. eWatson]

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?

 

[Jim Thompson]

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 | |
| Voice480)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.

 

[ehsjr]

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