Fcc
Fcc
Terry Yager said...Must not interfere with other devices, and Must accept any incoming interference.
It kinda makes sense if you look at the phrasing in Class A digital devices:
FCC 15.105.a says...This equipment has been tested and
found to comply with the limits for a Class
A digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide
reasonable protection against harmful
interference when the equipment is operated
in a commercial environment. This equipment
generates, uses, and can radiate radio
frequency energy and, if not installed and
used in accordance with the instruction
manual, may cause harmful interference to
radio communications. Operation of this
equipment in a residential area is likely to
cause harmful interference in which case the
user will be required to correct the interference
at his own expense.
However, if you look at
FCC 15.105.b says...
NOTE: This equipment has been tested and
found to comply with the limits for a Class
B digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide
reasonable protection against harmful
interference in a residential installation.
This equipment generates, uses and can radiate
radio frequency energy and, if not installed
and used in accordance with the instructions,
may cause harmful interference
to radio communications. However, there is
no guarantee that interference will not occur
in a particular installation. If this equipment
does cause harmful interference to
radio or television reception, which can be
determined by turning the equipment off and
on, the user is encouraged to try to correct
the interference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment
and receiver.
—Connect the equipment into an outlet on a
circuit different from that to which the receiver
is connected.
—Consult the dealer or an experienced radio/
TV technician for help.
These are the "official notices" on user notification for Chapter 15 widgets in FCC lit. They do state, however, that the notice doesn't have to be exact, just in spirit, so I think is why most manufacturers have distilled it down to ...
Must not interfere with other devices, and Must accept any incoming interference.
Ok, maybe sense is overstating it. FCC Part 15 deals with unlicensed transmission.
The Class A digital device stuff basically says that this doohickie can emit messy low-power rf, shouldn't be used in a non-industrial settings, and you're stuck with whatever the effects are, and, if you're using at home, resolution of problems is at your cost.
Class B digital device basically says that this doohickie can emit messy low-power rf, you're stuck with the effects, but you should try to fiddle with it on your own if it louses up your TV reception. Or, in other words, if you're WiFi (a Chapter 15 device )messes up your neighbors cordless phone( a Chapter 15 device ) {cordless phone, not cell phone), and you like your neighbor, you should do some fiddling, but if not, then sc**w them.
Note that it deals ONLY wth interference to radio communications, NOT other devices. The big part of Chapter 15 tells you that your Chapter 15 widget must give way to licensed spectrum users and suck up any interference.
Cell phones are licensed spectrum users, governed under Chapter 22, so they get to interfere with Chapter 15 stuff. Undesirable, but not much you can do about it.
For more fun Title 47 readings go to
http://wireless.fcc.gov/index.htm?job=rules_and_regulations
My favourites are:
15.23 Home Built Devices
15.25 Kits
15.103 Exempted Devices (to the unintentional radiators stuff, i.e. Class A & Class B )
patscc