Wayne Stallwood ALUGlist@digimatic.co.uk wrote:
On Tue, 2007-09-18 at 15:07 +0100, MJ Ray wrote:
http://environment.independent.co.uk/lifestyle/article2944417.ece
Well I hope anyone even slightly concerned about that doesn't own or use a Mobile phone...stand too close to their microwave...drive near any TV transmitters or mobile masts..Use DECT phones or work in a building that uses them. [...]
The only ones of those I do are use a mobile phone sometimes and travel near masts, but then I use a hands-free kit to keep the transmitter away from my head. I have sod-all control over the siting of masts, they're not generally announced and I can't avoid them all. My house is in a mobile shadow, so the phone is usually off with its number diverted when I'm at home.
However, the differences of WiFi are that it's nearly always on and it's digital, whereas the ERP limits were set with analogue signals in mind, weren't they?
Dect phones often interfere with DVB-Satellite reception, which I take as a sign of generally poor equipment. It's also been enough fun talking to people whose cordless phones have turned to white noise mid-sentence that I don't want to inflict any more on the world.
Given that they don't interfere with much else why is it not the DVB Satellite receiver that is generally poor equipment ? Anything with a highly directional antenna that is picking up interference from a low power transmitter any further away that lying on top of it and not within the antennas focus has serious issues with the sensitivity/selectivity/screening of it's receiver IMO.
I doubt it's a poor receiver equipment problem because it's been reported with several receivers. A DVB Satellite receiver has to be pretty sensitive because it's receiving from a transmitter the size of a Fiesta parked thousands of kilometres above the equator. DECT phones seem to interfere with the signal on the cable between antenna and receiver in normal operation.
P.S. if you are talking to someone on a cordless and the signal turns to white noise then they are using an analogue one not a DECT phone. [...]
No, they were using DECT phones, but many DECT phones seem to start transmitting white noise as the battery fails. Maybe the handset could be smarter and shut off, but what sort of system design lets the handset transmit loud white noise in a common failure situation and then passes it to the telephone system, deafening the other caller?
Hope that explains,