[Code of Federal Regulations]
[Title 47, Volume 2]
[Revised as of October 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR24.135]

[Page 141]
 
                       TITLE 47--TELECOMMUNICATION
 
        CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)
 
PART 24_PERSONAL COMMUNICATIONS SERVICES--Table of Contents
 
                        Subpart D_Narrowband PCS
 
Sec.  24.135  Frequency stability.

    (a) The frequency stability of the transmitter shall be maintained 
within 0.0001 percent (1 
ppm) of the center frequency over a temperature variation of -30[deg] 
Celsius to +50[deg] Celsius at normal supply voltage, and over a 
variation in the primary supply voltage of 85 percent to 115 percent of 
the rated supply voltage at a temperature of 20[deg] Celsius.
    (b) For battery operated equipment, the equipment tests shall be 
performed using a new battery without any further requirement to vary 
supply voltage.
    (c) It is acceptable for a transmitter to meet this frequency 
stability requirement over a narrower temperature range provided the 
transmitter ceases to function before it exceeds these frequency 
stability limits.