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With a 5.8Ghz WLAN device, operating in the upper UNIII band, 5745mhz-5825mhz...

...is it required that if the device is using a standard 20mhz wide 802.11 channel, that you can ONLY be centered on the pre-defined frequencies of ch149/5745mhz, ch153/5765mhz, ch157/5785mhz, ch161/5805mhz, or (ISM Band) Ch165/5825?

Is it not allowed to set the center of the 20mhz wide operation channel to say, ch155/5775mhz?

I would think that as long as you are within the 5745-5825mhz, it shouldn't matter what the center frequency is.

I'm being told that with a 20mhz, you can only use those 5 pre-defined channels as their center frequency. What about devices that are capable of 10mhz and 5mhz wide channel use?

Thanks in advance.

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If your equipment supports it, you can set it to Channel 155, however, this is not desirable, as you will get interference from the two adjacent channels. The recommendations are just that, recommendations. There are no requirements in FCC 15.245 or 15.247 (ISM regulations) for a specific channel, as long as you are not near the band's edge.

Edit: Following Dave's comment: There are the U-NII (15.407) rules which differ slightly from the 15.247 rules, but there is no specific channel requirements. If the equipment supports it, any frequency inside the band can be used. As for narrow band FHSS transmissions, there is a different set of requirements which applies to them.

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  • \$\begingroup\$ He can use only 20 Mhz of the 80 MHz channel if he wants to. Also, FCC 15.401. There are more documents to read for the 5.8GHz ISM band \$\endgroup\$ – Dave Dec 24 '15 at 9:47

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