InssomniakThe Glitch Premium Member join:2005-04-06 Cayuga, ON |
Absolute farthest edge of 2.4 band?For Canada:
Is it 2400mhz the lowest edge and 2474mhz the highest legal edge? I'm asking because of a post on ubnt forums suggesting Canada had slightly different rules for that band.? |
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I believe the range in Canada is 2400-2483.5 MHz. |
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LLigetfa
1 recommendation |
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InssomniakThe Glitch Premium Member join:2005-04-06 Cayuga, ON 2 edits |
OK thanks!
I am assuming then I could operate at 2474mhz with a 10mhz width, leaving me at 2479mhz edge and well, 4.5mhz of guard space.?
Edit: Frequency wrong |
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lutful... of ideas Premium Member join:2005-06-16 Ottawa, ON
1 recommendation |
lutful
Premium Member
2013-Jan-30 10:05 am
The radio was most probably tested to pass at the upper end of the 2.4Ghz spectrum only when centered on CH 11 with standard 20Mhz wide channel.
The narrower 5Mhz/10Mhz wide channels are implemented in the baseband and are usually not tested separately towards the edges. You can check the official test results.
Anyway, when you shift the center frequency any higher than CH 11 center, even with narrower bandwidth, it may spill sufficient RF into the licensed 2.5Ghz band to attract someone's attention ... eventually. |
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InssomniakThe Glitch Premium Member join:2005-04-06 Cayuga, ON |
Is there any way for me to test that theory myself? being fairly close to the transmitter and seeing on a spectrum analyzer what kind of power might be spilling over?
Assuming all I have is a wide array of 2.4ghz antennas, a wi-spy, and the subject radio 120 feet in the air. |
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lutful... of ideas Premium Member join:2005-06-16 Ottawa, ON |
lutful
Premium Member
2013-Jan-30 3:20 pm
Use 1Mhz or smaller frequency slots and check if the emission level drops off sharply at the uppermost slots of 2.4Ghz ISM band. |
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bburley join:2010-04-30 Cold Lake, AB |
to Inssomniak
I am not sure if testing yourself will be a guarantee that you will meet Industry Canada's specifications. I think you would need a fairly expensive spectrum analyzer (not the typical CPE built-in ones).
I was talking with a manufacturer recently and they were saying that it was going to be very difficult to meet IC's requirements for one of their new products. |
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InssomniakThe Glitch Premium Member join:2005-04-06 Cayuga, ON |
said by bburley:I am not sure if testing yourself will be a guarantee that you will meet Industry Canada's specifications. I think you would need a fairly expensive spectrum analyzer (not the typical CPE built-in ones).
I was talking with a manufacturer recently and they were saying that it was going to be very difficult to meet IC's requirements for one of their new products. I wasnt needing to be that exact. Ive noticed that with these newer atheros chips "Merlin" that the cutoffs are much better than the older stuff to the point that I can actually co-locate (10 feet apart) 2 radios on channel 6 and 9 in 10mhz, without self interference and negligible loss in RX sensitivity. That was impossible with the older ones. |
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