FYI.....
Please make sure that you are running the most recent version 5.2 on the M
series... Older firmware had known issues in setting up the output power.
Faisal
On Jun 24, 2010, at 10:06 AM, "Stuart Pierce" <spie...@avolve.net> wrote:
> I see negligible difference in signal strength anyway between 20 and 27.
>
> ---------- Original Message ----------------------------------
> From: Francois Menard <fmen...@xittel.net>
> Reply-To: WISPA General List <wireless@wispa.org>
> Date: Thu, 24 Jun 2010 09:03:59 -0400
>
>> Or you can be legit in Canada, and go for 3.65 GHz and get up to 57 dBM
>> legally in rural areas ;)
>>
>> Courtesy of the guy that changed the rules for 3.65 in Canada and is looking
>> for the US to do the same...
>>
>> F.
>>
>> On 2010-06-23, at 5:41 PM, Fred R. Goldstein wrote:
>>
>>> I'm just a little confused about some of these nice-looking access
>>> points. The UBNT Rocket M5, for instance, can put out +27 dBm. It
>>> plugs *right into* a nice 19dB sector antenna. Okay, the smaller,
>>> 120 dB sector is only 16 dB. Now math is not really my thing but I
>>> get a total ERP there of +43 to 46 dBm.
>>>
>>> FCC Rule 15.247 states that the maximum transmitted power output for
>>> digitally-modulated intentional radiators in the 5725-5850 MHz band
>>> ("ISM") is 1 watt, and the maximum antenna gain is 6 dBi. Each
>>> additional dB of antanna gain means one less dB of power. So the
>>> maximum ERP is 4 watts (+36).
>>>
>>> Point-to-point is an exception in that specific band; it is allowed
>>> unlimited antenna gain. But "point-to-multipoint systems,
>>> omnidirectional applications, and multiple co-located intentional
>>> radiators transmitting the same information" are under the cap.
>>>
>>> So am I correct in assuming that everybody who uses the Rocket M5, or
>>> any other similar PtMP system for subscriber access, turns the
>>> transmitter power REAL low (~+20 + feedline loss), in order to keep
>>> the ERP below +36? Or are we assuming that since you're technically
>>> only transmitting and receiving to one end user at a time, it's really PtP?
>>>
>>> SkyPilot's legal hack, of course, is to have eight 45 degree sector
>>> antennas and only use one at a time, so it is legally PTP even with
>>> +42 EiRP. And with advanced 11N 4x4 beamforming antennas, something
>>> like that will become relatively easy. But we're not quite there
>>> yet. Thoughts?
>>>
>>> --
>>> Fred Goldstein k1io fgoldstein "at" ionary.com
>>> ionary Consulting http://www.ionary.com/
>>> +1 617 795 2701
>>>
>>>
>>>
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>>
>>
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