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Bert22306
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CEO
re: What part of Part 15 didnít you read?
Bert22306   10/26/2011 9:50:38 PM
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BTW, what I meant by that last sentence was, it is the microwave oven that is non-compliant. Not the 6lowpan or 802.11 device. Microwave ovens do not initially scan for signals in the band they will radiate on. So blame them, not 6lowpan.

Bert22306
User Rank
CEO
re: What part of Part 15 didnít you read?
Bert22306   10/26/2011 8:35:29 PM
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That's why we have cognitive radio. You first see whether a given band is available, and then you start using it. Oh, just like 802.11 has been doing for years already. For short range wireless, like 6lowpan devices are expected to be, this works reasonably well. Because typically, it is the strongest signals, in this type of network, that matter most. This does not work well in mands like the GPS band, or even TV bands, obviously, because there very weak signals are the ones you want. Yes, there are those ill-behaved appliances like microwave ovens. Nothing new there.

sharps_eng
User Rank
Rookie
re: What part of Part 15 didnít you read?
sharps_eng   10/26/2011 6:19:21 PM
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So we are talking about something happening that has been warned about for years. Lets learn from another area where warnings were ignored - finance. Finance did not 'oil the wheels'; it created friction, by taking a slice of every transaction; it disrupted stable arrangements in order to get slice of the recovery processes, and it never actually created a solitary cent of net wealth. It won't continue, the inequalities are too great and in the internet age, too obvious, but is anyone going to take avoiding action? A clean, organised, well-policed RF spectrum could deliver new products and services for centuries, but we will pollute it faster and faster with poorer and poorer-quality products until it hits a ceiling of impracticality, and the opportunities and value to industry will disappear like a seam of ore in a worked-out mine. And we're just gonna sit here and talk about it? Ideas, guys, ideas please!

Blake2
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Rookie
re: What part of Part 15 didnít you read?
Blake2   10/26/2011 4:12:11 PM
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I agree--I used to have a 100-ft ethernet cable attached to my laptop that reached anywhere in the house I wanted to go... until our new puppy chewed it in half one day. But hey! Now I'm wireless!

kdboyce
User Rank
Rookie
re: What part of Part 15 didnít you read?
kdboyce   10/26/2011 5:38:39 AM
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Problems are already happening. For example, I know of a functioning ISM 2.4GHz system with small external antennas working just fine here in the US but gets clobbered by QRM in South Korea. The only way to make it work well is to strip away the external receiver antenna and reduce the overall gain of signal levels into the receiver from anything else but the closest paired transmitter. To maintain high quality signals, and good distance, the transmitter runs its maximum output with an external antenna. This only adds to the overall QRM. I have no idea of what the ISM 2.4GHz spectrum looks/sounds like in Korea, but it is crowded.

dwhite
User Rank
Rookie
re: What part of Part 15 didnít you read?
dwhite   10/25/2011 8:19:48 PM
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I agree. I'm always amazed by the push for wireless communications in devices that are tied down with power supply wires.

BicycleBill
User Rank
Rookie
re: What part of Part 15 didnít you read?
BicycleBill   10/25/2011 5:11:49 PM
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Often a wire is the best, cheapest, most secure, most reliable connection between points A and B--let's never forget that in the rush to "wireless everything".

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