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Bert22306
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re: What part of Part 15 didn’t 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
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re: What part of Part 15 didn’t 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
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re: What part of Part 15 didn’t 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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re: What part of Part 15 didn’t 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
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re: What part of Part 15 didn’t 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
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re: What part of Part 15 didn’t 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
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re: What part of Part 15 didn’t 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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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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