On 12/1/2014 8:48 AM, Mike Hammett wrote:
5150 != DFS.
That's right, which is why it's +41 rather than +30. That number from
the actual FCC approval that the NanoBridge M got for U-NII-1. The
allowable maximum power is gated by the out-of-band EIRP at 5150, which
has to be -27 dBm/MHz, a very stringent standard. That's why the
technical U-NII-1 EIRP PTP limit of +53 dBm is never met, and why
there's a petition to fix the rule. I think I saw one vendor radio get
approval for +48 though, probably not using the same Atheros chipset.
From the NanoBridge 5M's recent approval:
FCC ID: SWX-NBM5D
(SWXNBM5D, SWX NBM5D)
Application: 802.11n 2x2 MIMO
Application Type: Class II permissive change or modification of
presently authorized equipment
Equipment Class: II - Unlicensed National Information Infrastructure TX
Date: 08/04/2014
Operating Frequencies:
Grant Notes FCC Rule Parts Frequency
Range (MHZ) Output
Watts Frequency
Tolerance Emission
Designator
41 CC MO ND *15E* *5255.0* - *5340.0* *0.0004* ** **
41 CC MO ND *15E* *5475.0* - *5595.0* *0.0003* ** **
41 CC MO ND *15E* *5665.0* - *5715.0* *0.0003* ** **
41 CC MO ND *15E* *5265.0* - *5320.0* *0.0014* ** **
41 CC MO ND *15E* *5500.0* - *5580.0* *0.0016* ** **
41 CC MO ND *15E* *5660.0* - *5700.0* *0.0016* ** **
41 CC MO ND *15E* *5275.0* - *5310.0* *0.0015* ** **
41 CC MO ND *15E* *5510.0* - *5550.0* *0.0016* ** **
41 CC MO ND *15E* *5670.0* - *5670.0* *0.0016* ** **
39 41 CC MO *15E* *5180.0* - *5240.0* *0.0396* **
Note that the first approvals on the list (around -5 dBm) are for
operation very close to a band edge (5250 was a band edge at the time;
it no longer is.) The U-NII-1 approval begins at 5180. However, XM
5.5.10 does allow the NanoStation to be tuned down lower, or even to
5155 if you set it to 5 MHz. And if you leave on "auto adjust to EIRP
limit", it caps the power on the AP side to +36 (the PtMP limit) on
5150-5250, but doesn't enforce the +36 cap on 5725+.
I'm not 100% certain that the test lab was following the rules, though,
as there is no band edge to protect at 5725.
*From: *"Fred Goldstein" <f...@interisle.net>
*To: *wireless@wispa.org
*Sent: *Sunday, November 30, 2014 11:23:35 PM
*Subject: *Re: [WISPA] 5 ghz backhaul sanity check
On 11/30/2014 11:55 PM, Josh Luthman wrote:
> I have a link at 6.6 miles with a pair of Rocket M5. It's at 5765 and
> has worked beautifully for a couple of years now. It is -55 on each
> side with 2' dishes.
>
> I'm looking at doing another link that's almost identical (one similar
> tower) and my calculations are showing if I use 5660 at 14dbm tx power
> I should see -56. Does this sound right at all? 6.6 miles seems far
> off the top of my head for the DFS band.
The ERP limit there is +30, so if you're using +14 tx power, then the
antenna gain is only 16 dB or you're noncompliant. That's what a
NanoStation does on DFS. A big dish (like the 2 footer, around 30 dB
gain) would still help with receive gain but you would have to turn down
the Rocket to something lower (0 dBm).
UBNT DFS stuff is approved for +41 dBm EIRP or so on the 5150 band,
though.
--
Fred R. Goldstein k1io fred "at" interisle.net
Interisle Consulting Group
+1 617 795 2701
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http://lists.wispa.org/mailman/listinfo/wireless
--
Fred R. Goldstein k1io fred "at" interisle.net
Interisle Consulting Group
+1 617 795 2701
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Wireless mailing list
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http://lists.wispa.org/mailman/listinfo/wireless
