The part 15 rules for 2.4 GHz operation state that a maximum transmitter output of 1 watt with a 6 dbi omni antenna is legal. This is 4 watts eirp. With a directional antenna you must decrease your transmitter power 1 db below 1 watt for every 3 db antenna gain over 6 dbi.
Confusing as this may seem, it means that you can have 250 milliwatts of transmitter output with a 24 dbi gain antenna. That is 18 db over the original 6 dbi which is 6 units of 3 db each. This means that the transmitter power must be reduced from 1 watt to 250 milliwatts (6db).
This is an effective isotropic radiated power of 64 watts and is perfictly legal.
Check the gain of a 36 inch dish at 2.4 GHz and do the calculations to see if it is legal or not.
73
Tony W4TAS
----- Original Message ----- From: "Tony Langdon" [email protected] To: "Nate Duehr" [email protected]; "joseph Murray" [email protected] Cc: [email protected] Sent: Monday, October 09, 2006 4:22 PM Subject: [amsat-bb] Re: More Clutter on 2.4 GHz
At 03:11 AM 10/10/2006, Nate Duehr wrote:
Also illegal. Check the FCC's ERP limits for point-to-point 802.11 and I believe you'll find that what your ISP did for you is breaking the law.
36" dish + 100 mW looks to me like it's way above the ISM band EIRP limits for unlicensed use, since the limit is 100mW EIRP.
Hmm, I thought your base EIRP was 4W (same as it is here) for 2.4 GHz wifi (and probably other SS/high speed data networking), and that under US rules, you could increase that further on point to point links on a sliding scale (we can't, it's 4W for all antenna configurations here).
73 de VK3JED http://vkradio.com
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