I think you may have made a typo, but R/C aircraft models are on 72MHz in
the US, not kHz range. Your device should fall under the unintentional
radiator area and I believe, unless you can find some loophole, technically
you are required to meet the emissions criteria for FCC. If you send it
into other countries, well be prepared for another barage of tests as they
generally require immunity, meaning that it has to be immune to ESD
(electrostatic discharge), emissions off of the signal lines themselves,
etc etc etc. Generally, you need to test to the fifth harmonic of the
highest clock frequency. Well, in your case, looks like 20MHz, but the
radiated emissions (measured with an antenna) start at 30MHz.

I'm developing a telemetry unit myself for the R/C hobby industry, but it
will have an intentional radiator, so will need to meet FCC, etc.

I'll let you find out more when I do. I have to dig into the standards at
work because I deal with things in the field like this there, but are not
sure of some of the exemptions that may fall into this area. But, R/C
receivers in the plane are FCC part 15 compliant. You don't want to
interfere with them, so the FCC may regulate that you have a product
checked.

Take a look at some of these links. It will give you an idea of the
standards by country.

http://www.ul.com/emc/
http://www.ul.com/emc/emcfaq1.html
In the Q&A section, look at "What are the EMC laws in the United States? "
http://www.ul.com/emc/emcacc.html

http://www.baclcorp.com/Test_services.htm
http://www.baclcorp.com/certification_process.htm
http://www.baclcorp.com/tcb_info.htm

Hopefully, this helps some.

Michael


> [Original Message]
> From: Drew Vassallo <snurple@HOTMAIL.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
 > Date: 6/12/02 11:56:56 AM
> Subject: [PIC]: FCC question
>
> The latest thread regarding FCC compliance got me thinking.  I'm about to
> start on producing my first commercial product (100% developed and
produced
> by me, that is), which is intended for the model airplane (hobby)
industry.
> I hope to produce at least a few hundred per year.
>
> Basically it's an in-flight monitor (no RF or telemetry) that stores
> measured values of altitude, etc.  The unit operates at 4 MHz and borrows
> power from the flight battery pack of the radio control.  (I don't know if
> any of this matters, but I'm including it for information.)
>
> Do I have to be concerned about FCC compliance for this application?  That
> is, do I have to have this formally certified in order to sell it
> commercially?  Does it need some sort of markings on the package that
> indicate compliance?  Or can I just "let the buyer beware" so to speak?  I
> feel that this is a relatively innocuous application, and this isn't going
> to cause problems with the radio controls (they typically operate in the
72
> KHz range), as I've tested it on a number of airplanes using various
radios.
>
> --Andrew
>
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- Michael Luvara

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