I noticed that the original 450 SM only does 5470 - 5875, whereas the 450b does 4900 - 5925. I was just wondering why that is, I am assuming it is a difference in the chipset / radio hardware, and not the software.
Yep, different filters and FCC certs. 450i SM's can also access the entire 5GHz band as well.
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Due to hardware differences, Eric is correct... the old 450 SM hardware was only capable of 5.4 and 5.8 GHz bands, while the new radio hardware 450i and 450b is capable of 4.9, 5.1, 5.2, 5.4 and 5.8 GHz.
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