Exhibit A

0594-EX-PL-2006 Text Documents

Mobile Satellite Ventures Subsidiary LLC

2006-10-17ELS_78343

Exhibit A

Mobile Satellite Ventures Subsidiary LLC (“MSV”) requests an experimental license to
transmit on certain frequencies in the L-band (1551.213 - 1555.187 MHz) from a fixed antenna
installed on the roof of a building adjacent to MSVs headquarters in Reston, Virginia that will be
used to support an upcoming test and demonstration of MSV’s next-generation Ancillary
Terrestrial Component. See Call Sign WC9XRS. With the experimental STA requested here,
MSV seeks authority to transmit on the specified L-band frequencies from a fixed antenna to
determine the amount of RF isolation between this antenna and MSV’s existing L band antennas
at its Reston, Virginia facility used for ongoing satellite operations. The test will entail
transmitting a low-power (less than or equal to 0 dBW EIRP) carrier from the antenna and
measuring the received power level at several outdoor locations on MSV’s Reston gateway
premises. This testing may be performed over extended time periods of up to several days in
order to characterize long-term fading and possible diurnal effects. MSV’s predecessor, Motient
Services Inc., received an experimental STA to conduct similar tests in October 2000. See File
No. 0462-EX-ST-2000 (granted October 4, 2000).

Document Created: 2006-10-17 15:23:12
Document Modified: 2006-10-17 15:23:12

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