[AMRadio] More Hash and Buzzies

Jim Wilhite w5jo at brightok.net
Fri Mar 26 16:48:34 EDT 2010

I encountered the same situation with the FCC over the air handler unit 
to my HVAC,  it is a multi speed motor that is controlled by a PWM 
signal.    The noise it puts out is nothing like this thing though but I 
followed up with the manufacturer and they would not, (first) admit the 
problem with in their unit, and (second) would not provide any help 
other than telling me to buy a filter from Radio Shack.

I contacted the FCC about the problem and found that the only 
requirement in Part 15 below 30 Mc. has to do with conducted signals, 
not only that, the limits are very liberal.  So ,if you have one of 
these phones  near you, probably the best thing to do is transmit on the 
frequency their oscillator is using with a lot of power and hope the 
user will experience enough trouble to dump the damn thing.

We need a re-write of the re-write of part 15 for signals below 30 meg 
but don't hold your breath unless you have a Congressman or Senator who 
is on the budget committee.


----- Original Message ----- 

> The other day I posted a message that contained the following:
> "Right now, I believe our greatest threat is not that the FCC might 
> outlaw
> AM
> or that commercial interests will take our HF bands away at the next 
> (although we must always keep our eyes open for any such indications); 
> our
> greatest concern at the moment has to be the proliferation of cheap, 
> poorly
> designed consumer products and other technology that unnecessarily 
> pollutes
> the HF spectrum with buzzies and hash.  Just a few examples include 
> BPL, the
> new digital/LED traffic signals, plasma TV's, touch lamps, HomePlug 
> gadgets,
> and whatever new product came on the market this morning to spew 
> additional
> trash in our bands"
> If you were wondering what that new product might be, well, here it 
> is.
> This just came in off the RFI reflector.
> Don, k4kyv
> Date: Thu, 25 Mar 2010 19:01:50 -0700
> I've tried contacting Ooma, and they are stonewalling me. FCC Part 15 
> has no
> limits for radiation under 30 MHz (thanks FCC). There is some language 
> about
> ALL radiations being minimized, however. How do I get to Ooma 
> engineering?

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