Sec. 15.319  General technical requirements.

    (a) The 1910-1920 MHz and 2390-2400 MHz bands are limited to use by 
asynchronous devices under the requirements of Sec. 15.321. The 1920-
1930 MHz sub-band is limited to use by isochronous devices under the 
requirements of Sec. 15.323.
    (b) All transmissions must use only digital modulation techniques.
    (c) Peak transmit power shall not exceed 100 microwatts multiplied 
by the square root of the emission bandwidth in hertz. Peak transmit 
power must be measured over any interval of continuous transmission 
using instrumentation calibrated in terms of an rms-equivalent voltage. 
The measurement results shall be properly adjusted for any instrument 
limitations, such as detector response times, limited resolution 
bandwidth capability when compared to the emission bandwidth, 
sensitivity, etc., so as to obtain a true peak measurement for the 
emission in question over the full bandwidth of the channel.
    (d) Power spectral density shall not exceed 3 milliwatts in any 3 
kHz bandwidth as measured with a spectrum analyzer having a resolution 
bandwidth of 3 kHz.
    (e) The peak transmit power shall be reduced by the amount in 
decibels that the maximum directional gain of the antenna exceeds 3 dBi.
    (f) The device shall automatically discontinue transmission in case 
of either absence of information to transmit or operational failure. The 
provisions in this section are not intended to preclude transmission of 
control and signaling information or use of repetitive codes used by 
certain digital technologies to complete frame or burst intervals.
    (g) Notwithstanding other technical requirements specified in this 
subpart, attenuation of emissions below the general emission limits in 
Sec. 15.209 is not required.
    (h) Where there is a transition between limits, the tighter limit 
shall apply at the transition point.
    (i) Unlicensed PCS devices are subject to the radiofrequency 
radiation exposure requirements specified in Secs. 1.1307(b), 2.1091 and 
2.1093 of this chapter, as appropriate. All equipment shall be 
considered to operate in a ``general population/uncontrolled'' 
environment. Applications for equipment authorization of devices 
operating under this section must contain a statement confirming 
compliance with these requirements for both fundamental emissions and 
unwanted emissions. Technical information showing the basis for this 
statement must be submitted to the Commission upon request.
[ 58 FR 59180 , Nov. 8, 1993, as amended at  59 FR 32852 , June 24, 1994;  59 FR 40835 , Aug. 10, 1994;  60 FR 13073 , Mar. 10, 1995;  61 FR 41018 , Aug. 
7, 1996]

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