Part 15 conducted emission limits only apply to a very specific test set up
for compliance testing, which may or may not reflect the real world
application of the device. The compliance test can help raise a red flag,
but it may or may not be an adequate test in relation to the real world
application of the DUT (device under test).
The major problem I have with part 15 is the lack of radiated field limits
below 30 Mhz (not the radiated field limits acceptable during compliance
testing), but rather the radiated field limits that would define "Harmful
Interference", and without this it's very difficult from an engineering
standpoint to say someone is not compliant when discussing frequencies
below 30 Mhz. The term "Harmful Interference" is vague (probably
intentionally so). If my noise level goes up 3 dB is that "Harmful
Interference"? If my noise level goes up 1 dB is that "Harmful
Interference"? What defines "Harmful Interference"? If the interference
has a very narrow bandwidth is that considered "Harmful Interference" since
I can easily move frequency (except when the station I'm trying to work is
on the frequency where the interference is located).
So far I have been lucky and no one has challenged me when I track down
interference to their location and tell them they are causing interference,
but it sure would be nice to have technical data in hand that defines the
problem from a numerical standpoint.
Don Kirk (wd8dsb)
On Thu, Sep 29, 2016 at 6:53 AM, Charles Gallo <charlie@thegallos.com>
wrote:
> But part 15 limits are not low enough
>
> --
> 73 de KG2V
> Charlie
>
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>
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