That feeling is correct. Simple way to study it. Build a simple NEC
model and compute the response for a range of frequencies, one after
another. Write down the field strength at the same horizontal and
vertical angle. Do the same for every other horizontal and vertical angle.
Time consuming? Sure, but you'll learn a lot. Oh -- and when you build
that model, be sure to include signal return, whatever it is. Like the
green wire running through the home that houses the noise source, maybe
cable TV.
BTW -- there are very few devices that produce energy uniformly across
the spectrum. The vast majority of electronic sources are the harmonics
of switch-mode power supplies, variable speed motor controllers, or
clocks for microprocessors. These are anything but uniform, showing up
as "humps" of noise at intervals of 10-20 kHz, or steady carriers that
don't move. The nature of these harmonic sources is that they get weaker
with increasing frequency.
73, Jim K9YC
73, Jim K9YC
On 2/11/2021 11:02 PM, Tony wrote:
I have a feeling it's not as simple as that.
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