Gerhard Fiedler <lists <at> connectionbrazil.com> writes:

> You didn't mention the country, what type of device, what frequency range,
> whether this is commercial (for sale) or for your own use. (I think this
> are the main parameters.)

In general, world wide.

The devices I gave as examples all have CE and some have FCC ratings. I wonder
if this implies testing or just the right stencil at the package
manufacturer's. This is of course not for myself (I will not likely ask for 
permission to run a known low power 'unintentional' radiator in my lab - if 
I'd have to do that I would have to get written permission every time I turn 
on a SMPSU without the shields and filters mounted - and my own radio(s) tell 
me already when I'm 'broadcasting').

By this I mean, what chapter should these devices fall under ? I.e. a very low
power device could simply radiate at any frequency it wishes as long as it 
stays under the FCC ratings ? That would be too good to be true (and I suspect
that it's true although the lawmakers did not mean it to be like that). As you
know, a couple of uW go a long way with a good receiver.

F.ex. my likely very wrong calculations based on a point isotropic radiator 
and a matched lambda/2 dipole at 2 meters distance seem to indicate that I 
need 0.5uW radiated RF for 10uV@50Ohms receiving at 100MHz. I don't quite 
believe that someone needs a license for a 0.5uW radiator (the LO leakage from 
the average FM radio is several times that). (0.5uW radiated corresponds to
100nA at 5V 'input' power at eta=100% - assuming the osc. is 1% efficient and
'transmission' attenuation is 40dB - likely for a LO - this is still only 
1mA@5V LO osc input power - so clearly the average FM radio's LO stray 
radiation outperforms 'my' transmitter by a wide margin).

thanks,
Peter P.


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