RF Output Power Measurements

FCC ID: OIIDTSA1900-2

Test Report

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FCCID_37318

Omnipoint Technologies, Inc. Exhibit 11 FCC ID: OIIDTSA1900-2 Page 1 of 2 EXHIBIT 11 RF OUTPUT POWER MEASUREMENTS This exhibit describes the procedures employed and presents results of measurements of DTSA output power, as required by and performed in accordance with § 2.1046. Requirements Section 24.232 of the FCC Rules and Regulations governing operation of PCS equipment provides power limitations for base and mobile/portable stations. Per § 24.232(a), base (fixed) stations are limited to 1640 W peak equivalent isotropically radiated power (e.i.r.p.) with an antenna height up to 300 meters HAAT (height above average terrain). In no case may peak output power exceed 100 W. In § 24.232(b), mobile/portable stations are limited to 2 W e.i.r.p. peak output power. Measurement of transmitter RF output power are described in § 2.1046 and are necessary to obtain a certification grant of equipment authorization. For all measurements of output power, the RF output port of the DTSA was loaded with a matched 50 Ω impedance. Measurement Procedure Measurements of DTSA output power was performed using an HP8563E Spectrum Analyzer, with a resolution bandwidth set large enough to integrate the power in the entire transmitted burst. Prior to the measurement, signal path loss of the diagnostic system (cables and attenuator) was characterized at all frequencies at which output power was measured; this loss was then used to correct the raw readings to obtain precise measurements of DTSA RF output power. Measurements were made at the lowest (channel 512, 1850.2 MHz), middle (channel 661, 1880.0), and highest (channel 810, 1908.8 MHz) PCS-1900 defined channels in the licensed PCS spectrum. Specific procedures followed during measurements of RF output power were as follows: 1. Configure the DTSA: • Input Voltage 9.0 VDC • Mode Transmit, random data pattern selected using PC controller • RF Output Power Maximum level (step 0, 30 dBm nominal) and minimum level (step 15, 0 dBm nominal) selected using the PC controller • Frequencies Channel 512 (1850.2 MHz), Channel 661 (1880.0 MHz), and Channel 810 (1908.8 MHz) selected using the PC controller This document contains PROPRIETARY and CONFIDENTIAL information of Omnipoint Technologies, Inc.

Omnipoint Technologies, Inc. Exhibit 11 FCC ID: OIIDTSA1900-2 Page 2 of 2 2. Configure the HP8563E Spectrum Analyzer: • Center Frequency Center of selected channel • Span 1 kHz • RBW 1 MHz • Sweep Time 5 sec • Display Max Hold 3. Record peak RF output power, correcting for diagnostic system losses 4. Perform measurement at all three channels 5. Perform measurement at minimum power level (Step 15, 0 dBm nominal) Measurement Results DTSA output power measurement results are given in Table E11.1. All results have been corrected to account for diagnostic system losses. Table E11.1. RF output power measurement results. PCS-1900 Measurement Maximum Output Minimum Output Channel Frequency (MHz) Power (dBm) Power (dBm) 512 1850.2 31.00 0.33 661 1880.0 30.77 0.27 810 1909.8 30.00 -0.33 As the results in Table E11.1 indicate, the measured maximum RF peak output power of the DTSA is approximately 31.0 dBm, or 1.26 W. The nominal maximum RF output power of the DTSA is 1.0 W (30 dBm). The peak RF output power of the DTSA complies with the 100 W maximum for fixed applications given in § 24.232(a); peak e.i.r.p. will not exceed 1640 W (i.e., antenna gain will not exceed 32 dBi). For mobile/portable applications, compliance with the 2 W e.i.r.p. limit given in § 24.232(b) will be ensured by limiting antenna system gain (antenna gain minus RF interconnect cable loss) to 3 dB nominally. Note that in all applications, DTSA output power is controlled by the GSM network to minimize transmit power while maintaining the quality of the link. This document contains PROPRIETARY and CONFIDENTIAL information of Omnipoint Technologies, Inc.


Document Created: 2001-06-25 16:44:31
Document Modified: 2001-06-25 16:44:31
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