carram Wrote: > By the way just saw a programme on BBC TV ref. wifi and how interference > can affect reception. I use my SB3 using wifi only and its installed on > top my hifi gear which in turn in above the TV, I'm wondering if > electromagnetic interference from the TV can be causing the SB3's loss > of signal at times.
You'd be looking for devices which produce interference in the 2.4 GHz range. These would fall under two categories: 1. Devices which specifically transmit in the 2.4 GHz range. 2. Devices which emit broad-spectrum EMI, some of which would fall in the 2.4 GHz range. For category 1, the worst offenders are cordless phones and other wireless networks. For category 2, it could be anything, but microwave ovens are most frequently noted for doing so. Your TV and stereo gear do not transmit purposefully in the 2.4 GHz range, so that eliminates category 1, leaving category 2. I'm not an electrical engineer but I believe that in order to produce EMI into the 2.4 GHz range, the device needs to have a very powerful transmitter that can have harmonics up into the 2.4 GHz range - which is why microwave ovens are a problem here. Stereo gear does not contain a powerful transmitter. The power in this equipment is in the audio frequencies, 20 Hz - 20 kHz. There are probably EMI harmonics much higher than that which escape, but all the way up to 2.4 GHz? Probably not. Also this equipment is designed to prevent electrical noise from entering its circuits. The shielding, grounding and general design prevents EMI from escaping as well. With regards to a TV, you do have high-power devices, the CRT coils. These are high-power enough to generate EMI. However if your hearing is good enough you'll hear that the coils oscillate in the 18-20 kHz range. There would be higher EMI harmonics, but not likely as high as 2.4 GHz. > > PS. it seems even a wet dog can cause wifi interference! At first this sounded like a statement for 'Snopes' (http://www.snopes.com/) to investigate, but wet surfaces do inhibit the flow and penetration of radio waves. If the dog was big enough and close enough to the antenna, the waves would be blocked. -- Mark Lanctot ------------------------------------------------------------------------ Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=23883 _______________________________________________ squeezenetwork mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/squeezenetwork
