[RFI] Comments on RFI from Ductless Air Conditioning Units?

[Cortland Richmond]

it is worth remembering that most appliances are exempted from Part B 
(or A) at 15.103, only having to comply with not causing harmful 
interference. FCC Knowledge data base I see that new guidance last year 
removed exemption Verification (Section 2.902) for: External Thermostats 
connected via wire and not contained within the appliance, Exercise 
Equipment, Hair Dryers, Heat Guns, Hair straighteners, Electric 
Blankets, Paper Shredders, Bed Warmers, and Portable Personal Fan Heaters.


See Publication Number 772105 
<https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=33062> 
(3/29/2012) (new).

excerpt: /An exempt appliance is only exempt from equipment 
authorization procedures for the functions associated with the digital 
device circuitry.*The appliance remains subject to the requirements in 
Section 15.5 requiring the device not cause harmful interference, and 
Section 15.29 regarding inspection by the Commission.* It is strongly 
recommended that manufacturers or importers make every effort to meet 
the specific technical standards, follow appropriate FCC equipment 
authorization procedures, and comply with quality practices to ensure 
all units sold and marketed are, and will remain, compliant. /
(emphasis added)

Cortland
KA5S

On 5/12/2013 2251, Dale wrote:
> David,
>
> Be certain to specify FCC Part 15 Class B limits.  Those are the limits applicable to home and office environments.
>
> After that, it will then be up to you to determine if Part 15, Class B limits are, in fact, adequate for your application.  Keep in mind that if your antennas are fairly close to the shack or house (less than 50 feet away), you could still have problems with RFI, especially in the HF range.  You probably won't know until you try it.
>
> 73, Dale
> WA9ENA
>
>