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On 8/28/19 12:18 PM, Daniel Kunkel wrote:
I am currently working on a pig powered magnifier. I am wondering at what
power levels do I need to be concerned with RF interference and (USA)
Federal Laws and entities getting angry. I don't plan on going over 10KVA.
The good news is, I live out in the country. The bad news is, I live 2.5
miles (as the RF crow flies) away from a military base. And in between my
house and the base, is an off base facility 1.2 miles away (as the RF crow
flies). I believe it is a training center, but there are many antennas and
my radar detector goes crazy there, so I know there is some sort of comm
link between the base and the building.
Advice?
fortunately, tesla coils are terrible antennas.. So you're not an
"intentional radiator" for which damped wave emissions are prohibited.
Basically, if you interfere, and someone complains, you have to turn it
off.
Part 15:
§ 15.5 General conditions of operation.
(a) Persons operating intentional or unintentional radiators shall not
be deemed to have any vested or recognizable right to continued use of
any given frequency by virtue of prior registration or certification of
equipment, or, for power line carrier systems, on the basis of prior
notification of use pursuant to § 90.35(g) of this chapter.
(b)Operation of an intentional, unintentional, or incidental radiator is
subject to the conditions that no harmful interference is caused and
that interference must be accepted that may be caused by the operation
of an authorized radio station, by another intentional or unintentional
radiator, by industrial, scientific and medical (ISM) equipment, or by
an incidental radiator.
(c) The operator of a radio frequency device shall be required to cease
operating the device upon notification by a Commission representative
that the device is causing harmful interference. Operation shall not
resume until the condition causing the harmful interference has been
corrected.
(d)Intentional radiators that produce Class B emissions (damped wave)
are prohibited.
you're not marketing, so you don't need an authorization (Supplier's
Documentation of Conformity or certification) called out in 15.101
You're probably not in the 15.103 exempted devices, although conceivably
you could fit in (c) digital device used in test equipment..
Your radiated emission limits are easy: it starts at 30 MHz, and you're
probably not emitting more than 100 microvolts/meter at 30 Mhz and above.
Frequency of emission (MHz) Field strength (microvolts/meter)
30-88 100
88-216 150
216-960 200
Above 960 500
Just to add:
§ 15.23 Home-built devices.
(a) Equipment authorization is not required for devices that are not
marketed, are not constructed from a kit, and are built in quantities of
five or less for personal use.
(b) It is recognized that the individual builder of home-built equipment
may not possess the means to perform the measurements for determining
compliance with the regulations. In this case, the builder is expected
to employ good engineering practices to meet the specified technical
standards to the greatest extent practicable. The provisions of § 15.5
apply to this equipment.