Sierra AirCard 750 GPRS Card + interference

[chrisukcov]

Hi all,

Probably a simple one!

We have the above card in a Toshiba Laptop and when connecting we get interference similar to that of what you hear when a mobile phone rings near an electrical stereo or TV - Disabling all the internal speakers makes no difference.

Any clues cause its very annoying!!!

Chris

 

[Loon]

Chris

it has to be a speaker somewhere, the internal 'beeper' maybe? Are you using it near anything else with speakers?

Good luck!
Loon

BTW: The sound is caused by the GPRS card sending/receiving bursts of traffic/signalling information with the network. Because a GSM/GPRS TDMA frame is 4.51ms long, that makes 221 frames/second - which is an audible frequency, hence the series of beeps in quick succession.