Response

0165-EX-ST-2006 Text Documents

Mobile Satellite Ventures Subsidiary LLC

2006-07-13ELS_77003

Answers to FCC’s Questions Dated June 16, 2006 FCC File # 0165-EX-ST-2006 July 13, 2006 As requested by the FCC, this document provides additional measurement data related to the transmit out-of-channel emission (“OOCE”) and out-of-band emission (“OOBE”) transmissions of the WiNetworks base station (“BTS”). Figure 1 provides the spectrum density measurements of the BTS at the output of the power amplifier (“PA”). We have also attempted to collect measurements at the output of the cavity filter, but the signal level was so low at 1550.00 MHz and 1558.50 MHz (at noise level), that the results became inaccurate. As such, we are providing the spectrum power density measurements along with the cavity filter performance characteristics (Figure 2). Tables 1 and 2 provide OOCE and OOBE analyses based on data obtained from the power spectrum density measurements and filter performance characteristics. As indicated, the BTS OOCE and OOBE levels are well below the FCC’s maximum allowable levels. 47 C.F.R. §§ 25.253(b), 25.253(c)(9). Figure 1: Carrier Spectrum Characteristic (PA Output Power = 38 dBm) Page 1 of 3

Figure 2: Cavity Filter Characteristics Page 2 of 3

OOCE Analysis Table 1 provides calculation of OOCE into adjacent MSS band. Table 1: OOCE Analysis Analysis of OOCE from BTS into Adjacent Band Parameter Trial Units Remarks Transmit Frequency 1553.0 MHz Number of BTS 1 Measurement at 1550.00 MHz -23.95 dBm Transmission loss -2.4 dB Resolution BW 100 kHz BTS Tx PSD (at antenna input) -46.4 dBW/MHz Activation Loss -1.25 dB TDD 3:1 Additional Filter -31.0 dB @ 1550.00MHz Effective BTS OOCE power density -78.6 dBW/MHz OOCE Limit for L-band BTS -57.9 dBW/MHz (47 C.F.R. § 25.253(b)) Margin 20.7 dB OOBE Analysis Table 2 provides calculation of OOBE into GPS band. Table 2: OOBE Analysis Analysis of OOBE from BTS into GPS Parameter Trial Units Remarks Transmit Frequency 1553.0 MHz Number of BTS 1 Measurement at 1558.50 MHz -42.48 dBm Transmission loss -2.4 dB BTS Tx Antenna Gain 16 dBi Effective BTS OOBE EIRP -28.88 dBm Resolution BW 100 kHz BTS Tx PSD -48.9 dBW/MHz Activation Loss 0.00 dB Additional Filter -63.0 dB Effective BTS OOBE EIRP density -111.9 dBW/MHz OOBE Limit for L-band BTS -70.0 dBW/MHz (47 C.F.R. § 25.253(c)(9), (g)(3)) Margin 41.9 dB Page 3 of 3


Document Created: 2006-07-13 13:49:05
Document Modified: 2006-07-13 13:49:05
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