Schematics

Report No.: I20W00023-WWAN_Rev1
Chongqing Academy of Information and Communication Technology
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No. 8,Yuma Road, Chayuan New City, Nan’an District, Chongqing, P. R. China,401336
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Page 526 of 585
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5.7 Frequency Stability over Voltage Variation
Specifications:
FCC Part 2.1055, 22.355, 24.235, 27.54,90.213
DUT Serial Number:
866884045632254
Test conditions:
Ambient Temperature:15℃-35℃
Relative Humidity:30%-60%
Air pressure: 86-106kPa
Test Results:
Pass
Limit
Frequency deviation
[ppm]
±2.5
Test Setup
The EUT was placed in a shielding chamber and powered by an adjustable power supply,
demonstrated as figure V. A Wireless Telecommunications Test Set was used to set the TX
channel and power level, modulate the TX signal with different bit patterns and measure the
frequency of TX.
Measurement Uncertainty:
Item
Uncertainty
Expanded Uncertainty
15 Hz (k=2)
Test Method
The EUT was powered by the adjustable power supply. The frequency stability is measured by the
Wireless Telecommunications Test Set.
Note: Only worst case result is given below.