(EDITED) wifi (1km) need help with FCC compliance for antenna and transmiter
时间：04-07
整理：3721RD
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Im very worried that I planned a point to point Wifi connection wrong and i might be sending Wifi 2.4Ghz single beyond the FCC 1 watt limit regulations. the problem lies in not being able to tell what the Dbm of my hardware is at the antenna. here is my setup im a nube at this kind of stuff so please let me know if i made a bad choice in hardware.
I have spent 3 days scowering websites about how to caculate watts,dbm,dbi, and db. i belive that my setup will be to powerfull with out having FCC certification.
From what I could put to geather my access point is 27dBm but I think on low power mode its 14dBm (at least the emulater on tp-link site claims so, but the settings i see on the access points are not specified as Dbm in the settings only as high and low.
The antenna is 24dbi directional.
so according to Raidolabs caculater Radiolabs - Wifi Range Calculator
14dBm and 24Dbi = 38 dB and is way to powerfull. (I think) 30dB/1Watt is the limit.
I think I would need a 6dBm access point power to stay at 1watt with a 24 dbi antenna.
Would some one check my setup and let me know if what i have setup should not be turned on.
I have included links to my hardware setup for refrence if needed.
Thanks
Im also using POE to with a short antenna cable and adapter.
24DBI 2.4Ghz Die cast grid antenna from jefatech
JEFA Tech: 24dBi 2.4Ghz Die Cast Grid Antenna
and the antenna spec sheet
http://support.jefatech.com/specsheets/PAWDCA-24.pdf
Im useing TP-Link 54Mbps High Power Wirless Access Point TL-WA5110G
TL-WA5110G - Welcome to TP-LINK
Thanks again. I have not been able to sleep well because I cant stop thinking about this. I'm worried.
(EDIT)OK im going to attampt to answer my own question. please verify my understanding regarding FCC regulations.
(b) The maximum peak output power of the intentional radiator
shall not exceed the following:
(1) For frequency hopping systems in the 2400-2483.5 MHz band
employing at least 75 hopping channels, and all frequency hopping
systems in the 5725-5850 MHz band: 1 Watt. For all other frequency
hopping systems in the 2400-2483.5 band: 0.125 Watt.
(4) Except as shown in paragraphs (b)(3) (i), (ii) and (iii) of this
section, if transmitting antennas of directional gain greater than 6 dBi
are used the peak output power from the intentional radiator shall be
reduced below the stated values in paragraphs (b)(1) or (b)(2) of this
section, as appropriate, by the amount in dB that the directional gain
of the antenna exceeds 6 dBi.
Sec. 15.247 Operation within the bands 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz.
(i) Systems operating in the 2400-2483.5 MHz band that are used
exclusively for fixed, point-to-point operations may employ transmitting
antennas with directional gain greater than 6 dBi provided the maximum
peak output power of the intentional radiator is reduced by 1 dB for
every 3 dB that the directional gain of the antenna exceeds 6 dBi.
according to Sec. 15.247
if i have a 24dBi Antenna i need to..
24dBi - 6dBi = 18Dbi over the inital 6dbi
30dBm transmit - 6dBi antenna
29dBm transmit - 9dBi antenna
28dBm transmit - 12dBi antenna
27dBm transmit - 15dBi antenna
26dBm transmit - 18dBi antenna
25dBm transmit - 21dBi antenna
24dBm transmit - 24dBi antenna
so my 24 dBi Antenna is 18 dBi over so i need to lower my point to point TL-WA5110g device below 24.dBm (im not counting cable loss besause im using POE and loss is almost insignificant)
my TL-WA5110g has settings range of 26dBm to 14dBm with a option for high power mode that im not using.
I set mt TL-WA5110g to lowest power mode and i belive that is 14 dBi according to tplink's emulater for this model on their webpage.
Would you agree that with the TL-WA5110g set at 14dBm and the 24dBi directional for a point to point connection would be within the regulations of the FCC? and that i could increase my TL-WA5110g to 24dBm if needed and even still be with in FCC Regs?
Im starting to feel more confident that i have cracked the complicted dBm, dBi and FCC codes but as this is my very first setup like this, im still somewhat worried.
Plase verify! Thanks every one
I have spent 3 days scowering websites about how to caculate watts,dbm,dbi, and db. i belive that my setup will be to powerfull with out having FCC certification.
From what I could put to geather my access point is 27dBm but I think on low power mode its 14dBm (at least the emulater on tp-link site claims so, but the settings i see on the access points are not specified as Dbm in the settings only as high and low.
The antenna is 24dbi directional.
so according to Raidolabs caculater Radiolabs - Wifi Range Calculator
14dBm and 24Dbi = 38 dB and is way to powerfull. (I think) 30dB/1Watt is the limit.
I think I would need a 6dBm access point power to stay at 1watt with a 24 dbi antenna.
Would some one check my setup and let me know if what i have setup should not be turned on.
I have included links to my hardware setup for refrence if needed.
Thanks
Im also using POE to with a short antenna cable and adapter.
24DBI 2.4Ghz Die cast grid antenna from jefatech
JEFA Tech: 24dBi 2.4Ghz Die Cast Grid Antenna
and the antenna spec sheet
http://support.jefatech.com/specsheets/PAWDCA-24.pdf
Im useing TP-Link 54Mbps High Power Wirless Access Point TL-WA5110G
TL-WA5110G - Welcome to TP-LINK
Thanks again. I have not been able to sleep well because I cant stop thinking about this. I'm worried.
(EDIT)OK im going to attampt to answer my own question. please verify my understanding regarding FCC regulations.
(b) The maximum peak output power of the intentional radiator
shall not exceed the following:
(1) For frequency hopping systems in the 2400-2483.5 MHz band
employing at least 75 hopping channels, and all frequency hopping
systems in the 5725-5850 MHz band: 1 Watt. For all other frequency
hopping systems in the 2400-2483.5 band: 0.125 Watt.
(4) Except as shown in paragraphs (b)(3) (i), (ii) and (iii) of this
section, if transmitting antennas of directional gain greater than 6 dBi
are used the peak output power from the intentional radiator shall be
reduced below the stated values in paragraphs (b)(1) or (b)(2) of this
section, as appropriate, by the amount in dB that the directional gain
of the antenna exceeds 6 dBi.
Sec. 15.247 Operation within the bands 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz.
(i) Systems operating in the 2400-2483.5 MHz band that are used
exclusively for fixed, point-to-point operations may employ transmitting
antennas with directional gain greater than 6 dBi provided the maximum
peak output power of the intentional radiator is reduced by 1 dB for
every 3 dB that the directional gain of the antenna exceeds 6 dBi.
according to Sec. 15.247
if i have a 24dBi Antenna i need to..
24dBi - 6dBi = 18Dbi over the inital 6dbi
30dBm transmit - 6dBi antenna
29dBm transmit - 9dBi antenna
28dBm transmit - 12dBi antenna
27dBm transmit - 15dBi antenna
26dBm transmit - 18dBi antenna
25dBm transmit - 21dBi antenna
24dBm transmit - 24dBi antenna
so my 24 dBi Antenna is 18 dBi over so i need to lower my point to point TL-WA5110g device below 24.dBm (im not counting cable loss besause im using POE and loss is almost insignificant)
my TL-WA5110g has settings range of 26dBm to 14dBm with a option for high power mode that im not using.
I set mt TL-WA5110g to lowest power mode and i belive that is 14 dBi according to tplink's emulater for this model on their webpage.
Would you agree that with the TL-WA5110g set at 14dBm and the 24dBi directional for a point to point connection would be within the regulations of the FCC? and that i could increase my TL-WA5110g to 24dBm if needed and even still be with in FCC Regs?
Im starting to feel more confident that i have cracked the complicted dBm, dBi and FCC codes but as this is my very first setup like this, im still somewhat worried.
Plase verify! Thanks every one
At 27 dbm, you are only allowed 15 dBi antenna gain. At 14 dBm, you are allowed your full 24 dBi antenna gain.
Part 97 vs Part 15 and Permissible Power Comparison
Rich
OK Thanks!