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View Full Version : Solution to RF Interference on AM radio when Squeeze Box ispowered up



Charlie Richman
2004-12-27, 20:40
Like some others, I had unacceptable RF interference
with AM radio from my Squeezebox. (It sounded like
sparkplug/ignition noise.) I narrowed the problem
down to the Uniplug power supply. The RF radiated
from the p/s itself was not the issue, but it was
radiated through my preamp/amp/speaker wiring via the
Squeezebox RCA connectors. Even if my stereo and the
Squeezebox were off.

Swapping to a 2nd Uniplug didn't do it, and neither
did a ferrite bead choke... but a $11 eBay replacement
p/s did the trick.

You need a 5 volt regulated supply, and you'll
probably need to splice the original p/s connector
onto the new p/s. Be sure to check the polarity with
a voltmeter. (I don't expect things would go well if
you got it backwards.)

Mine came from Excellent Electronic Components and was
listed as a "5V/2A Regulated Wall Wart." I see they
have similar items available in their eBay store.

Charlie Richman



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Jeff Shanholtz
2004-12-29, 23:38
On Mon, 27 Dec 2004 19:40:56 -0800 (PST), Charlie Richman wrote:

> Like some others, I had unacceptable RF interference
> with AM radio from my Squeezebox. (It sounded like
> sparkplug/ignition noise.) I narrowed the problem
> down to the Uniplug power supply. The RF radiated
> from the p/s itself was not the issue, but it was
> radiated through my preamp/amp/speaker wiring via the
> Squeezebox RCA connectors. Even if my stereo and the
> Squeezebox were off.
>
> Swapping to a 2nd Uniplug didn't do it, and neither
> did a ferrite bead choke... but a $11 eBay replacement
> p/s did the trick.
>
> You need a 5 volt regulated supply, and you'll
> probably need to splice the original p/s connector
> onto the new p/s. Be sure to check the polarity with
> a voltmeter. (I don't expect things would go well if
> you got it backwards.)

I have the same problem. However, as I just got a squeeze for Christmas
(also own a slimp3), I'm preparing to buy either a coax or toslink/optical
cable. Since I also have confirmed that the noise is reaching my receiver
via the rca cables, obviously the toslink cable will eliminate the
interference. However, my preference otherwise is to go with coax. Is it
safe to assume coax will transmit the interference just as the rca cables
do?

seanadams
2004-12-30, 00:41
Charlie,

I'll talk to our power supply vendor about this, and see if there's
something we can implement short of using a different supply. We have
received very favorable feedback for the tiny power supplies - most
products still come with the ancient "brick" style, which is cheaper,
but a PITA to fit in a power strip (and more expensive to ship because
of the weight).

I'm curious if you tried optical toslink instead of the RCAs. That will
block any conducted rf between the systems.

Sean

On Dec 27, 2004, at 7:40 PM, Charlie Richman wrote:

> Like some others, I had unacceptable RF interference
> with AM radio from my Squeezebox. (It sounded like
> sparkplug/ignition noise.) I narrowed the problem
> down to the Uniplug power supply. The RF radiated
> from the p/s itself was not the issue, but it was
> radiated through my preamp/amp/speaker wiring via the
> Squeezebox RCA connectors. Even if my stereo and the
> Squeezebox were off.
>
> Swapping to a 2nd Uniplug didn't do it, and neither
> did a ferrite bead choke... but a $11 eBay replacement
> p/s did the trick.
>
> You need a 5 volt regulated supply, and you'll
> probably need to splice the original p/s connector
> onto the new p/s. Be sure to check the polarity with
> a voltmeter. (I don't expect things would go well if
> you got it backwards.)
>
> Mine came from Excellent Electronic Components and was
> listed as a "5V/2A Regulated Wall Wart." I see they
> have similar items available in their eBay store.
>
> Charlie Richman
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Mail - Find what you need with new enhanced search.
> http://info.mail.yahoo.com/mail_250
>