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jwireless
09-25-2007, 04:53 PM
Please help? Max EIRP @ 5.8GHz?
What is the max EIRP @ 5.8GHZ?
Are there different numbers for Point-to-Point and Point-to-Multipoint designs?
I did have one manufacturer tell me the following:
Point-to-Multipoint:
Base = 36dBm / CPE = 53dBm...is this correct?
Thanks
In the 802.11a frequency range there are three distinct 100MHz bands
UNII-1: 5.15GHz to 5.25GHz/Max output of 40mW and only used indoors
UNII-2: 5.25GHz to 5.35GHz/Max output of 200mW and used in and outdoors
UNII-3: 5.725 to 5.825GHz/Max output of 800mW and used outdoors
POINT to MULTI-POINT link:
The same intentional radiator power limit applies for all three bands. when using a maximum antenna gain of 6dBi. If the antenna gain is greater then the 1:1 rule applies, for each 1dB of gain above the 6dBi then 1dB of power from the intentional radiator must be reduced by 1dB
Max in UNII-1: 40mW=16dBm, so 16dBm+6dBi=22dBm or 160mW
Max in UNII-2: 200mW=23dBm, so 23dBm+6dBi=29dBm or 800mW
Max in UNII-3: 800mW=29dBm, so 29dBm+6dBi=35dBm or 3200mW
POINT to POINT link:
FCC uses the POINT to MULTIPOINT EIRP power ratings for UNII-1 and UNII-2 in POINT to POINT links. UNII-3 can use 800mW at the intentional radiator with an maximum antenna gain of 23dBi before the 1:1 rule applies. Which means 29dBm+23dBi=52dBm or 200Watts EIRP.