For anyone that cares to fact check this the guy at the FCC to talk to is John Reed. He wrote much of the part-15 rules. I ask him whenever I'm not sure.

Here goes:

900 mhz. max of 36 dB eirp. Period. Max radio output of 30 dB (1 watt) period.

5.1 is indoor only, very low power. I don't remember how much but I'm thinking 250mw or some such.

5.3 (sometimes called 5.2) 30 dB period. never more. I think the radios are limited to 24 dB (250mw). You CAN drop the radio output and run higher gain antennas and get very long ranges. We used to run a lot of 10 to 15 mile ptp links with Wireless Inc. radios.

5.7 (unii) has a strange power rule to it. I can't remember how it all works exactly, stick with manufacturer advice.

5.8 36 dB max for ptmp. for ptp (remember, customers are considered ptp) it's max of 30 dB of radio output, no limit on antenna gain.

OK, now for the most confusing one.
2.4. PTMP is 36 dB. Unless you run an active antenna or switched multiple sector distribution point that sees very small sectors then you can follow the ptp rules up to a certain point. Vivato and Navini are the only companies I know of that are certified under these rules. It's actually a much better idea for rural than urban deployments due to noise levels.

2.4 ptp is max of 30 dB (1 Watt) of radio (or amp) tx power and 6 dB of antenna gain. After that it's down one on tx power and up 3 dB on antenna gain. You can, legally run 10,000 watts at 2.4. All you need is one of those NASA type antennas to do it :-).

On the certification thing. All antennas use have to be of the same type (yagi, grid, dish, panel, omni, sector etc.), same pattern and equal or lesser gain than what's been certified.

If you are running radios that are certified only with 2.2 dB rubber ducky antennas, then you can't put anything bigger than that on them.

Penalties for not following the rules range from fines to replacement of the offending gear. Thus far I know of NO one that's been shut down but I do know of people who've had to change things out or get equipment specially certified.

Hope that helps,
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----- Original Message ----- From: "Anthony Will" <[EMAIL PROTECTED]>
To: "WISPA General List" <>
Sent: Monday, January 02, 2006 7:40 PM
Subject: Re: [WISPA] FCC regs question

This only applies to the 2.4ghz ISM band there are different rules for the 900mhz and 5.8 ISM band plus different rules for the UNII rules.

The ISM rules state, 900mhz is a total of 36dbm EIRP no mater if it is multi point or PtP. 5.8ghz is 1 watt power and as large a antenna you can put on it for PtP and 36dbm total EIRP for multi point.

This is how I understand the rules. You are not technically allowed to swap out other manufacture antenna's only allowed to use lower gain antenna from the same manufacture this is of the same basic type that has the type acceptance registered with the FCC for any given radio transmitter. For example if a pacwireless 18dbi flat panel is registered you can use any flat panel from pacwireless that is 18dbi or less in gain. Now there has been a lot of "unofficial" statements by members of the FCC that have stated twists or bends in the antenna selection part of the rulings but I have yet to see anything that states otherwise on a official document.


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" <>
Sent: Monday, January 02, 2006 1:59 PM
Subject: [WISPA] FCC regs question


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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