FlyerTalk Forums - "Morse code" like sound on phones?

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- - "Morse code" like sound on phones? (https://www.flyertalk.com/forum/travel-technology/617631-morse-code-like-sound-phones.html)

Quote:

Originally Posted by joe19812

I thought it was Bluetooth interference. Whenever I'm on my desk phone, I'll get that same sound just before my cell phone rings.
My Bluetooth is always on and I thought it was trying to signal the headset and causing interference on deskphone.

Bluetooth is such a low power system I doubt it could interfere with anything...

That noise you hear is the transmission from a Blackberry.

Not only cheap speakers. I've noticed this with several different brands of professional studio monitor speakers - powered/active ones (in fact IIRC it happens in all the studio facilities i use) . I haven't done any tests to discern whether it leaks in via unbalanced wiring into the mixer, or is picked up directly by the circuitry in the loudspeakers. And the phone doesn't have to be REALLY close either - even 10-15 feet away - I have students sitting in class with phones on vibrate or silent, and until they realise what's going on I to can amaze them with my magical powers by asking who is going to get a message or call in a couple of seconds......!

Quote:

Originally Posted by husker267

I've noticed that some speakers - particularly cheap, unshielded PC speakers are very vulnerable to this. I've had clients complain that their speakers must be going bad due to this noise. Of course, they have their cell phones sitting on the desk not 6 inches from the speakers. Showing them what causes it and seeing the understanding flash across their faces is sometimes priceless.

Quote:

Originally Posted by NickW

I assume you have the wrong model number in there, because a Nokia 6030 is a dual-band (900/1800MHz) GSM phone that won't work in the US. Either that, or Nokia marketing is re-using model numbers :(

Evidently they're re-using model numbers, because it's a 6030... checked under the battery just to make sure. Only had it a couple of months now.

Quote:

Originally Posted by SixAlpha

Evidently they're re-using model numbers, because it's a 6030...

That's crazy - yup, I checked the USA site for Nokia and they market an almost-identical phone to the European model - except that it works on 850/1900MHz instead of 900/1800MHz. It is still a GSM phone, though.

For those of you who still believe that mobile phones cannot interfere with aircraft flight instruments, this is one of a number of interferences that come out on the crew's headphones when people have mobiles switched on in the cabin - or even have them turned to silent. The crew may be well ahead of you but the aircraft aerials are just above your head.

Been there and heard it.