AFAIK (without doing a lot of research) there is nothing in the ISM regulations 
that specifies channel size.  The rules cover frequency, use, out of band 
emissions, etc. but so not specify channel size, modulation, etc.

Even if the equipment is certified the details of the installation and antenna 
installation may result in out of band emissions into the band the company has 
a license for, and the FCC can and will investigate and potentially cite you as 
the operator if there is actual interference.  The difficult part on both sides 
(you and the licensed operator) will be proving that the interference exceeds 
the OOB limits that the licenses are based on.   The licensed user gets 
protection to a specified level, but nothing more.


Mark Radabaugh
WISPA FCC Committee Chair

> On Jun 21, 2018, at 2:57 PM, Steve Barnes <> wrote:
> We had an issue this week where we had a Power company have a 50K licensed 
> band at 901.152 Mhz for power meter reading.  We have still a few older links 
> that are 900MHz on Yagi’s to individuals in deep woods.  I had to move 
> channels all over the place as a 902-912MHz 10Mhz channel with UBNT does not 
> have edge filters that don’t pollute down to 901MHz.  So moving to the middle 
> of the band cleaned up the noise on their license. 
> Now they are claiming that 10MHz channel width in the 900MHz ISM band is 
> Illegal.  That the channel width is to be no larger than 8MHz. I have read 
> all kinds of ISM docs from the FCC and I see no mention of max channel 
> widths.  They made mention of talking to the FCC if we didn’t fix the issue. 
> Proof they are wrong any one?   This is a national company with a $10K 
> Anritsu analyzer they hired in to find the noise.
> Steve Barnes
> Wireless Operations Manager
> New Lisbon Broadband
> 765-584-2288 ext:1101
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> Wireless mailing list

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