Motorola V186 - Cell Phone - GSM System Planner Manual page 128

Communications
Sum of the Highest Modulating Frequency plus Deviation shall not exceed a stated
maximum. For most channels, that maximum is 2800 Hz but on two frequencies
(173.2100 and 173.3900 MHz) the maximum is 1700 Hz. The splinters were exempt
from all Refarming actions and still require a 5K60F2D emission designator.
ACE3600, when using DPSK modulation, uses a 1200 Hz modulating tone; the legal
allowable deviation on the "2800" channels is therefore 1.6 kHz whereas on the "1700"
channels the legal deviation is an unusable 500 Hz. FSK is theoretically usable but at an
impractical small deviation (300 Hz); DFM may not be used because it is not an F2
emission. PL/DPL must never be used because their deviation (750 Hz) must be
subtracted from the data deviation which worsens an already marginal situation.
Therefore, DPSK modulation at 1.6 kHz is the only legal emission available for "2800"
splinter frequency use; never use the "1700" frequencies and never use PL/DPL on a
splinter frequency. Refer to the FCC rules or other applicable regulations to understand
additional constraints on maximum Effective Radiated Power, antenna height, and
antenna directivity.
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