Intertek Testing Services
Ericsson Inc.
Model: DT-620
FCCID: AXAROA1173201
Report Name: ERI2433.DOC
14 of 28
Transmitting on Channel 3 (1925.625 MHz)
Frequency Range
MHz
Frequency
MHz
Corrected Level
dBm
Limit
dBm
30 – 1923.125
1918.000
-42.0
-39.5
1923.125 – 1924.125
None detected
-29.5
1924.125 – 1927.125
None detected
-9.5
1927.125 – 1928.125
None detected
-29.5
1928.125 – 19300.00
2151.280
3851.256
-48.4
-68.3*
-39.5
* Noise Floor
Spurious Emissions, Radiated
See Section 3.2.2 of this report for the radiated emissions data.
3.2.16 Frame Repetition Stability / Frame Period and Jitter
The frame period (a set of consecutive time slots in which the position of each time slot can be identified
by reference to a synchronizing source) of an intentional radiator operating in these sub-bands shall be 10
milliseconds/X where X is a positive whole number. Each device that implements time division for the
purposes of maintaining a duplex connection on a given frequency carrier shall maintain a frame repetition
rate with a frequency stability of at least 50 parts per millions (ppm). Each device which further divides
access in time in order to support multiple communication links on a given frequency carrier shall maintain
a frame repetition rate with a frequency stability of at least 10 ppm. The jitter (time-related, abrupt,
spurious variations in the duration of the frame interval) introduced at the two ends of such a
communication link shall not exceed 25 microseconds for any two consecutive transmissions.
Transmissions shall be continuous in every time and spectrum window during the frame period defined for
the device.
The DT-620 was tested at Ericsson Inc. See Appendix B for the test results.
3.2.17 Frequency Stability §15.323 (f)
The frequency stability of the carrier frequency of the intentional radiator shall be maintained /-10
ppm over 1 hour or the interval between channel access monitoring, whichever is shorter. The frequency
stability shall be maintained over a temperature variation of -20° to +50° degrees C 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° C. For equipment that is capable only of operating from a battery, the
frequency stability tests shall be performed using a new battery without any further requirement to vary
supply voltage.
Frequency Stability
Temperature C°
Supply
Voltage
Frequency of
Carrier, MHz
Measured
Frequency, MHz
Deviation,
ppm
-20
Nominal
1925.625
1925.6238
1.97
+20
Nominal
1925.625
1925.6200
Reference
+50
Nominal
1925.625
1925.6245
-0.36
