[wireless-regdb] [RFC] wireless-regdb: Update 5 GHz rules for Canada
Johannes Berg
johannes at sipsolutions.net
Mon Feb 6 23:52:30 PST 2017
On Mon, 2017-02-06 at 14:50 -0600, Seth Forshee wrote:
> + (5150 - 5250 @ 80), (23), AUTO-BW
For 20 MHz this is right, since the document says:
The maximum e.i.r.p. shall not exceed 200 mW or 10 + 10 log10 B,
dBm, whichever power is less. B is the 99% emission bandwidth in
megahertz. The e.i.r.p. spectral density shall not exceed 10 dBm in
any 1.0 MHz band.
However, for < 20 MHz, like 5 or 10, which we in theory do support, you
can't use that much due to the spectral density requirement. It seems
possible that that's where the 17 dBm came from, since 10 + 10 log10(5)
is about 17.
johannes
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