To: WayCool, 你說“FCC就允許100mw的發射功率”，究竟你有沒有看過FCC part 15?

• Frequencies include 902-928 MHz, 2400-2483.5 and 5725-5850 MHz
• Maximum Transmitter Power Output (TPO) is 1.0 watt or 30dBm
• The formula for converting antennas from dBi to dBd is dBi-2.2=dBd

There are two different classifications for operation.
Point to Point (PTP) and Point to Multipoint (PTMP):

PTP: is when two sites talk only to eachother.
PTMP: is when multiple sites talk to a single core site.

Each of these modes have different EIRP (Effective Isotropic Radiated Power) limitations.

Point to MultiPoint (PTMP) Limitation:

• The maximum EIRP power allowed is 36dBm (4 watts).

Maximum transmitter power versus largest antenna table for PTMP
Transmitter RF power	Antenna GainM	EIRP in watts
30dBm 1W	6dBi	3.98
27dBm 500mW	9dBi	3.98
24dBm 250mW	12dBi	3.98
20dBm 100mW	15dBi	3.98
17dBm 50mW	18dBi	3.98
14dBm 25mW	21dBi	3.98
10dBm 10mW	24dBi	3.98

• Higher EIRP is allowed if the antennas are directional in nature.
• Systems operating in a point-to-point operation may use transmitting antennas with directional gain greater than 6 dBi, provided the maximum output power of the transmitter is reduced by 1dB for every 3dB that the directional gain of the antenna that exceeds 6 dBi. Maximum transmitter power versus largest antenna table for PTP:

Maximum transmitter power versus largest antenna table for PTP
Transmitter RF power	Antenna GainM	EIRP in watts
30dBm 1W	6dBi	3.98
29dBm 800mW	9dBi	6.35
28dBm 630mW	12dBi	10.14
27dBm 500mW	15dBi	15.81
26dBm 398mW	18dBi	25.23
25dBm 316mW	21dBi	40.28
24dBm 250mW	24dBi	62.79
23dBm 200mW	27dBi	100.2

This information is just provided as a guideline. We highly recommend that you read the FCC Part 15 rules and understand them before attempting any installations.