Sec. 15.15  General technical requirements.

    (a) An intentional or unintentional radiator shall be constructed in 
accordance with good engineering design and manufacturing practice. 
Emanations from the device shall be suppressed as much as practicable, 
but in no case shall the emanations exceed the levels specified in these 
rules.
    (b) An intentional or unintentional radiator must be constructed 
such that the adjustments of any control that is readily accessible by 
or intended to be accessible to the user will not cause operation of the 
device in violation of the regulations.
    (c) Parties responsible for equipment compliance should note that 
the limits specified in this part will not prevent harmful interference 
under all circumstances. Since the operators of part 15 devices are 
required to cease operation should harmful interference occur to 
authorized users of the radio

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frequency spectrum, the parties responsible for equipment compliance are 
encouraged to employ the minimum field strength necessary for 
communications, to provide greater attenuation of unwanted emissions 
than required by these regulations, and to advise the user as to how to 
resolve harmful interference problems (for example, see Sec. 15.105(b)).