email 5/25 questions

0085-EX-CN-2017 Text Documents

AT&T; Services, Inc.

2017-05-25ELS_192603

Anthony Serafini From: Anthony Serafini Sent: Thursday, May 25, 2017 7:28 PM To: 'david.wolter@att.com' Subject: Questions for 0085-EX-CN-2017 Hello David Our International Bureau has the following questions and comments concerning your application. Please respond to the following. IB/SD has reviewed the subject request and has performed a worst-case analysis to assess the potential impact to license FSS received earth stations operating in the 3700-4200 MHz band. 3700 – 4200 MHz band Our analysis in the 3700 – 4200 MHz band indicates a high potential of harmful interference to in-band license FSS received earth stations from the experimental fixed and mobile stations operations. We will need additional information to determine the degree of potential of harmful interference in the 3700-4200 MHz band. We will need to know the exact antenna configuration/pointing directions, antenna altitudes, specific antenna gains & beamwidth and if antenna tilt-downwards. - What is the maximum antenna height above ground level for each fixed stations and each mobile stations? - Please provide an antenna pattern or a representative antenna pattern for the fixed and mobile stations. - What is the direction of each antenna pointing (azimuth and elevation angle)? Are they configure to provide a 360 degrees’ coverage? - Will the fixed antenna be down tilted? If yes, what is the tilt angle? - Are mitigation methods being used to preclude interference to incumbent license FSS receive earth stations? 27.5 – 28.35 GHz, 37-40 GHz bands New NGSO satellite operators will be using the 27.5‐28.35 GHz, 37‐40 GHz and 64‐71 GHz bands at a lower altitude and which will be susceptible to potential interference. ‐ Please provide antenna patterns or representative antenna pattern in the horizontal and vertical plane for each frequency band. ‐ Please indicate if antennas will be pointing towards the south, south‐west, south‐east, east or west. ‐ Indicate if the antenna will be pointing towards the ground or at the horizon. Is there any antenna that will be pointing above the horizon? 1

Regards Tony Serafini 2


Document Created: 2017-05-25 19:31:08
Document Modified: 2017-05-25 19:31:08
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