Operation to Avoid TDWR Declaration

FCC ID: QZEWLA322

Cover Letter(s)

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FCCID_1850003

For the US, this document supports: Avoiding interfering with Terminal Doppler Weather Radar (TDWR) (used near major airports) when using the 5.4-GHz band, especially within 35 km (21.75 mi) of the TDWR 4.1 US - OPERATION TO AVOID INTERFERENCE WITH TDWR The US FCC, NTIA, FAA, and industry are working to resolve interference to Terminal Doppler Weather Radar (TDWR) systems used near airports that has occurred from some outdoor wireless systems operating in the 5470 MHz – 5725 MHz band. These wireless devices are subject to Section 15.407. When operating as a master device they are required to implement radar detection and DFS functions and radios must not transmit on channels which overlap the 5600-5650 MHz band used by TDWR. Additional information is available from  the FCC’s Knowledge Database (KDB) Publication 443999 “Interim Plans to Approve UNII Devices Operating in the 5470-5725 MHz Band with Radar Detection and DFS Capabilities” available at https://fjallfoss.fcc.gov/kdb/GetAttachment.html?id=33781  the Wireless Internet Service Providers Association (WISPA) in coordination with Spectrum Bridge: http://www.spectrumbridge.com/udia/home.aspx. 5.4-GHz radios must be professionally installed. The professional installer must have the following expertise:  Understanding of the configurations outlined in Table 11: US FCC IDs and Industry Canada Certification Numbers and covered configurations, especially those applicable to the 5470-5725 MHz U-NII band.  Understanding of the master/slave operation of the device.  Understanding of the devices frequency scan selection settings and how they can be set to prevent scanning and therefore transmission on any specific frequencies.  Understanding of the option to set primary and two alternate frequencies on the device.  Ability to use the GUI to set the primary and alternate transmit frequencies on the device, scanned frequencies on an device, and Transmit Output Power of a radio.  Ability to use the spectrum analyzer feature of the radio to observe the local RF environment.  Ability to determine if a radio is within 35 km (21.75 mi) of any Terminal Doppler Weather Radar (TDWR) using the Search function available at http://www.spectrumbridge.com/udia/search.aspx, or using various mapping programs and the data from in Table 2: TDWR Location Information.  Ability to set the device's transmit frequency (frequencies, if using alternate frequencies) and device's scanned frequencies at least 30 MHz (center-to-center) from any TDWR operating frequency or frequencies within 35 km of the radio. To gain this expertise the following training is required:  Study of the documentation  Familiarization in a lab or test environment  Hands-on training with an experienced installer. Procedure 1 provides the specific instructions to avoid interfering with TDWR when using 5.4GHz devices

Procedure 1: Avoiding interference with Terminal Doppler Weather Radar (TDWR) 1. Use standard installation procedures with the additional steps outlined below. 2. For each 5.4-GHz device, determine if it is within 35 km (21.75 mi) of any Terminal Doppler Weather Radar (TDWR). This can be done using the map search tool at http://www.spectrumbridge.com/udia/search.aspx, or other mapping tools using the data from Table 2. 4. If an device is within 35 km (21.75 mi) of any TDWR, set the primary transmit frequency (and alternate frequencies, if used) to a frequency (or frequencies) at least 30 MHz (center-to-center) from the TDWR operation frequency shown on http://www.spectrumbridge.com/udia/search.aspx or in Table 2. 5. If a deviceis within 35 km (21.75) mi of any TDWR  Ensure its device is using primary and alternate (if used) transmit frequencies that are at least 30 MHz from the TDWR operation frequency  Set the devices scanned frequencies to not include frequencies within 30 MHz of the TDWR operation frequency. Note, even if the primary device itself is more than 35 km from the TDWR, if any of its clients are within 35 km, it must operate at least 30 MHz from the TDWR operation frequency. Note, in some instances a device may be within 35 km of multiple TDWRs. In this case, the device must use a frequency at least 30 MHz from all local TDWR operation frequencies. 6. Register each 5.4-GHz device operating within 35 km (21.75 mi) of any TDWR in the voluntary WISPA- sponsored database at http://www.spectrumbridge.com/udia/home.aspx. Note, this database may help expedite resolution of any interference to TDWRs. 7. Registration includes, at a minimum, Latitude, Longitude, and External Antenna Model. When registering a device, choose whether to allow General Access or to have the device information viewable only by you and government representatives.

Table 2: TDWR Location Information State City Longitude Latitude Frequency Terrain Antenna Elevation Height (MSL) (ft) above Terrain (ft) AZ PHOENIX W 112 09 46 N 33 25 14 5610 MHz 1024 64 CO DENVER W 104 31 35 N 39 43 39 5615 MHz 5643 64 FL FT LAUDERDALE W 080 20 39 N 26 08 36 5645 MHz 7 113 FL MIAMI W 080 29 28 N 25 45 27 5605 MHz 10 113 FL ORLANDO W 081 19 33 N 28 20 37 5640 MHz 72 97 FL TAMPA W 082 31 04 N 27 51 35 5620 MHz 14 80 FL WEST PALM BEACH W 080 16 23 N 26 41 17 5615 MHz 20 113 GA ATLANTA W 084 15 44 N 33 38 48 5615 MHz 962 113 IL MCCOOK W 087 51 31 N 41 47 50 5615 MHz 646 97 IL CRESTWOOD W 087 43 47 N 41 39 05 5645 MHz 663 113 IN INDIANAPOLIS W 086 26 08 N 39 38 14 5605 MHz 751 97 KS WICHITA W 097 26 13 N 37 30 26 5603 MHz 1270 80 KY COVINGTON CINCINNATI W 084 34 48 N 38 53 53 5610 MHz 942 97 KY LOUISVILLE W 085 36 38 N 38 02 45 5646 MHz 617 113 LA NEW ORLEANS W 090 24 11 N 30 01 18 5645 MHz 2 97 MA BOSTON W 070 56 01 N 42 09 30 5610 MHz 151 113 MD BRANDYWINE W 076 50 42 N 38 41 43 5635 MHz 233 113 MD BENFIELD W 076 37 48 N 39 05 23 5645 MHz 184 113 MD CLINTON W 076 57 43 N 38 45 32 5615 MHz 249 97 MI DETROIT W 083 30 54 N 42 06 40 5615 MHz 656 113 MN MINNEAPOLIS W 092 55 58 N 44 52 17 5610 MHz 1040 80 MO KANSAS CITY W 094 44 31 N 39 29 55 5605 MHz 1040 64 MO SAINT LOUIS W 090 29 21 N 38 48 20 5610 MHz 551 97 MS DESOTO COUNTY W 089 59 33 N 34 53 45 5610 MHz 371 113 NC CHARLOTTE W 080 53 06 N 35 20 14 5608 MHz 757 113 NC RALEIGH DURHAM W 078 41 50 N 36 00 07 5647 MHz 400 113 NJ WOODBRIDGE W 074 16 13 N 40 35 37 5620 MHz 19 113 NJ PENNSAUKEN W 075 04 12 N 39 56 57 5610 MHz 39 113 NV LAS VEGAS W 115 00 26 N 36 08 37 5645 MHz 1995 64 NY FLOYD BENNETT FIELD W 073 52 49 N 40 35 20 5647 MHz 8 97 OH DAYTON W 084 07 23 N 40 01 19 5640 MHz 922 97 OH CLEVELAND W 082 00 28 N 41 17 23 5645 MHz 817 113 OH COLUMBUS W 082 42 55 N 40 00 20 5605 MHz 1037 113 OK AERO. CTR TDWR #1 W 097 37 31 N 35 24 19 5610 MHz 1285 80 OK AERO. CTR TDWR #2 W 097 37 43 N 35 23 34 5620 MHz 1293 97 OK TULSA W 095 49 34 N 36 04 14 5605 MHz 712 113 OK OKLAHOMA CITY W 097 30 36 N 35 16 34 5603 MHz 1195 64 PA HANOVER W 080 29 10 N 40 30 05 5615 MHz 1266 113 PR SAN JUAN W 066 10 46 N 18 28 26 5610 MHz 59 113 TN NASHVILLE W 086 39 42 N 35 58 47 5605 MHz 722 97 TX HOUSTON INTERCONTL W 095 34 01 N 30 03 54 5605 MHz 154 97 TX PEARLAND W 095 14 30 N 29 30 59 5645 MHz 36 80 TX DALLAS LOVE FIELD W 096 58 06 N 32 55 33 5608 MHz 541 80 TX LEWISVILLE DFW W 096 55 05 N 33 03 53 5640 MHz 554 31 UT SALT LAKE CITY W 111 55 47 N 40 58 02 5610 MHz 4219 80 VA LEESBURG W 077 31 46 N 39 05 02 5605 MHz 361 113 WI MILWAUKEE W 088 02 47 N 42 49 10 5603 MHz 820 113 Latitude and Longitude are specified in NAD 83 Last updated July 30, 2010


Document Created: 2012-11-16 17:33:36
Document Modified: 2012-11-16 17:33:36
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