Here's a general topic - Cell Phone radiated RFI.

This cropped up just this morning.

Just switched over to FM for a bit this morning. Wanted to hear my 'alma mater' station, KNTU-FM - all Jazz.
(http://kntu.fm/, if you're interested in streaming! - all Jazz, 1920's through today...)

I have TWO radios here at work (your general, multi-story office building).

1. Hallicrafters S-38E (metal cabinet, etc). NEVER any RFI.
2. Modern GE SuperRadio III. Almost constantly interrupting RFI. Some periods (15 minutes or so) without, but long periods of 10 minutes of - dit-ddtttttttt-buzzz-braaappppp--dit-dit-buzz...

Within 10 minutes or so - the interference. Turned MY cell phone off completely. Didn't remove the battery though.
RFI Continued, so I'm guessing it's someone above, below or otherwise nearby.

How can I reduce or address this?
Ferrites on the speaker wires? (I've heard it's via the speaker, not actually thru the radio...)
Or, does the (latest model) GE SuperRadio just have a barn door IF, and I should try a different FM radio?
(Hey! I am finishing up on a Hallicrafters WR-700!)

Updated: Well, now that's a conundrum - now the S-38E is picking up the same RFI, but maybe not at the same rate.
Surely this comes in on speaker wiring or something. It's the exact same sound as on the FM receiver, but a lower volume.

Mike Yancey
KM5Z
Dallas, Texas

I have the same problem. I always know if my cell is about to ring, because if I am near any kind of device with speakers that is not shielded, I get an odd buzzing noise from the speakers.

That's the one; you know that sound.
Yesterday it was going on all morning, 'til I gave up w/radio at work.

I'm thinking some small beads on speaker wires, possibly.

Thing is - this type of RF is in the microwave area, so I'm not sure how to mitigate it.
Ham Radio RFI, I can handle...

Back to google for me...

Mike Y