Harold, Please check with your friendly local test lab, as I am going from memory here, but I'm pretty sure that this is the way it works: > These are all "class A digital devices" as defined in 15.3(h) That is, they meet the class A emissions standard. OK. > These devices are subject to "verification" as specified in > 15.101(a) So you have to test them for emissions before they may be marketed, like most consumer products with micros. > requires > devices subject to verification that are not receivers or cable input > selectors to have the following label: > 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, and (2) this device must accept any interference > received, including interference that may cause undesired operation. Yes, that's the standard (literally) wording. > This page of the rules (as shown in the PDF file) includes > graphics for labels that indicate the product is "for office or home > use." > It appears this artwork is only for products auhorized under a > "Declaration of Conformity." > Class A digital devices are not authorized > under a DOC (they are verified). There are several sets of requirements for different types of equipment. There is Certification, Notification, and Verification. "authorization" has no special meaning in this context as far as I know. The Declaration of Conformity is the document that declares that the device has indeed been tested. I think a DoC is required to state that you met the Verification standard. > So... it looks like the text shown above is what goes on the > product. The second condition (this device must accept any interference > received, including interference that may cause undesired operation.) > seems inappropriate in that the device is not a receiver. EVERY device is a receiver. If you don't believe me, go see if you r product works in the near field of your local broadcaster or (Even worse) Pager transmittter. > However, it > appears this must go on the device anyway. Yes. You have to use that wording, even though it confuses even a technical person such as yourself. Desregarding the obvious risksof attempting to interpret a government edict using (gasp) common sense, here is my translation: "This device's design was tested to make sure that the amount radio frequency energy that it radiates is small enough that it shouldn't cause any problem in typical residential service. "However, if this device does turn out to interfere with an allocated communication service, you may be required to stop using the device. (47 CFR 15.16 10-1-1995) "Also, this device might not work right under some circumstances because of other allocated radio services. If this occurs, it is NOT the responsibility of the allocated transmitter to cease operations to mitigate the problem." > Comments? In other words, this device's operation is secondary to any allocated communication service. Example 1: If my computer mouse fails becuase I live next door to a 50 kW AM radio station, that's the mouse's problem and mine, not the Chief Engineer's at the radio station. The reality of this example is that most radio stations will try to mitigate interference as a public service, because its good PR, and because they are plagued with nuisance lawsuits about this kind of problem, contrary to the intent of the regulations. But if they can't or won't, the Feds are NOT going to yank their license. The more likely scenario is that my computer mouse freaks out when my friendly licensed radio amateur next door fires up his transmitter. The reality of this one is the same as the pros, only usually friendlier. But the Feds are NOT going to yank his license just because your mouse won't work. Example 2: If my tested and labelled PC or whatever turns out to screw up the Instrument Landing System at the local airport, I can be required to stop using the PC. The reality of this is that the Class A and Class B limits were set to prevent this kind of nightmare. BUT the in the final analysis, if this occurred, you could be required to not use the PC in that location. Ain't this FUN! -Barry. ------------ Barry King, KA1NLH yup, that's MY transmitter :)