ePMP 2000 UNII-2 max TX power

Sorry if this is an old question. 

Why is the max TX power of the 2000 limited to 12 dBm in the UNII-2 bands?  I thought the rules are max TX of 250mW and max EIRP of 1W.  If we have a 13 dBi antenna, shouldn't we be able to TX around 17 dBm?


My understanding was that the 5.2-5.3 'middle band' part of UNII2 was limited to 13dB xmit and 30dB EIRP, while the 'extended' 5.4-5.7 UNII2 was limited to 14dB xmit and 30dB EIRP.  And that matches up with what I remember being limited to in ePMP AP settings in the past, but I just checked and sure enough it's telling me 12dB max transmit across the whole band from 5245-5705 on ePMP2000 sectors while the ePMP1000's (on the same or newer firmware) still allow 13dB and 14dB.


Which 13 dBi antenna are you referring to?

I see antennas from 17-23 dbi available for ePMP 2000.


We're using the RF Elements 60 deg horn antenna. 

The actual rule states,

(2) For the 5.25-5.35 GHz and 5.47-5.725 GHz bands, the maximum conducted output power over the frequency bands of operation shall not exceed the lesser of 250 mW or 11 dBm + 10 log B, where B is the 26 dB emission bandwidth in megahertz. In addition, the maximum power spectral density shall not exceed 11 dBm in any 1 megahertz band. If transmitting antennas of directional gain greater than 6 dBi are used, both the maximum conducted output power and the maximum power spectral density shall be reduced by the amount in dB that the directional gain of the antenna exceeds 6 dBi.

So the 250 mW (+24 dBm) applies to 20 MHz or wider channels. EIRP is capped at +30. If the channel is narrower than 20 MHz, the power is capped by the PSD (11 dBm/MHz). If it is a 20 MHz channel with a 13 dB antenna, 17m dB conducted power is allowed, though due to real world issues 16 dBm is more likely. OOBE also has to be taken into account when near a band edge (5350 or 5470).

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