[mdlug] OT - IR jamming

[Aaron Kulkis]

Clinton V. Weiss wrote:
> On Sat, Feb 16, 2008 at 11:18 PM, Aaron Kulkis <akulkis3 at hotpop.com> wrote:
>>  Alternate theory: have you ever noticed how the definition of
>>  a Class C consumer electronics device states, "this device
>>  *MUST* accept interference causing unwanted operation."
> 
> Where is your source for this information?
> 

The back of nearly any electronic device.  It's everywhere.

Picking something at random, the first object I picked up
was my new 2.5-inch SATA drive/USB 2.0 carrier, which has
the typical wording on the back:

	This device complies with Part 15 of the FCC rules.
	Operation is subject to the following two conditions:

	(1) This device may not cause harmful interference

	(2) This device must accept any interference recieved,
	including interference that may cause undesired operation.

	[FCC logo]   Tested to comply with FCC standards.



The only difference from years ago is that in the 70's
and 80's, there was a a title at the top, which said
"Class C consumer device."

In any event, you'll find it on all sorts of things.
TVs. Radios, alarm clocks.

Interestingly, my $150 HP-50G does not carry this
legend, but a $10 scientific calculator does.

The back of the HP-50G says:
		Complies with ICES-003, Class B



Class B devices cannot emit interference, but
ARE ALLOWED to reject interference.