Except it is a gray area. technically it says use antenna of similar design
of lesses gain. So if you use a higher gain antenna, and lower power, is it
living up to that same requirement.
In otherwords are they taking about less gain from the system EIRP or Less
gain from the antenna. The idea is that if you lower gain in the radio, you
are actually doing less harm to the enviroment and noise floor because you
are also reducing beanwidth, WITHOUT increasing power.
So the intent of the rule is that we should be able to do anything that
provides less harm to those around us regarding noise. Lower EIRP
regardless of the methid it is achieved is beneficial to the enviroment and
in line with the intent of the rule. However, it could be argued, that they
do not want to allow antennas of non-similar design when radio power is
reduced, because it allows WISPs to easilly on the fly abuse the power
limits. I'm not sure that its been ruled on. I'm not sure that we want it
ruled on. I think the FCC is watching to see what happens. To see if WISP
scan handle the responsibility of not abusing the rules. All the FCC wants
is to reduce intererence so more people can deploy and get along. They are
not going to go after anyone living by that same goal. At least that is my
take. I've been given different answers at different times. I've been told
lower EIRP suffices, others said technically thats not correct, iit states
similar antenna design of lesser gain.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Jason" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Monday, January 02, 2006 7:54 PM
Subject: Re: [WISPA] FCC regs question
So, can I use a radio capable of more than the legal limit as long as I
turn it down to a legal level programatically?
Tom DeReggi wrote:
Jason,
1. My ap with 3 separate 120deg sectors and radios is limited to 1 watt
EIRP per sector/radio, because it is PtMP.
No. Each AP radio/antenna combination is allowed a total of 36 db EIRP
(4watt).
(radio itself not to exceed 30 db + additional antenna 6 db, however no
reason radio power can't be less and antenna power more. )
2. My cpe's get the 3 to 1 rule because they are PtP
Right?
Correct.
More questions:
1. What about using types of antennas that are not certified with the
radio, ie, sectors where no sector is approved? This is not so clear.
Its been ruled that you know longer need to use a certified antenna, as
long as the substituted antenna is of equivellent design of certified
antennas, and of lesser gain.
Responsibility to broadcast at proper levels is not removed. You are then
taking that responsibility that you are personally certifying the antenna
is within the limits and specification.
2. Where can I determine the types of antennas that have been certified
with a given radio?
Contact the manufacturer. Also you can look up the FCCID of the radio. I
believe they list the antennas that were certified with it by
manufacturer.
Tom DeReggi
Jason
Tom DeReggi wrote:
Its spelled out towards the end of the document.
30 db max radio power + 6 db antenna. PTP 3 to 1 rule applies, to use
use much larger antennas at CPE side, and every 3 db antenna gain,
minus 1 db radio gain at CPE side.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message ----- From: "Jason"
<[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Monday, January 02, 2006 1:59 PM
Subject: [WISPA] FCC regs question
List,
Can anyone tell me what the current FCC regs are regarding EIRP? When
choosing an antenna radio combo are we limited to the maximum antenna
gain that has been approved for use with that particular radio? If
so, it eliminates the Super Range 2 radio for me since it's approved
for use with only a 2 dBi antenna. Or are we limited to the
calculated EIRP (the -1 dB for each 3dBi above 6dBi algorithm), which,
would allow the use of a 16 dBi antenna with this radio? I have read
and read and it seems that this is very open to personal
interpretation. Also it's difficult to determine what the latest
ruling is.
Jason Wallace
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