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Interactive Beam Footprint Library


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#1 OFFLINE   Gary Toma

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Posted 16 June 2011 - 10:54 PM

Directv Beam Footprint Library


UPDATE: May 23, 2012 Add D14 Beam Footprints
UPDATE: Jul 12, 2012 Add D4S and D7S Beam Footprints
UPDATE: Nov 16, 2012 Add KU76 @76W Beam Footprints (Directv SKY-Mexico)
UPDATE: Feb 7, 2013 Add KU45 @45W Beam Footprints (Directv SKY-Brazil)

UPDATE: Nov 23, 2013 Change D5 Beam Footprints from CONUS to Puerto Rico

UPDATE: May 2, 2014 Update DLA-1 @95W Beam Footprints (Directv Panamericana, IS30)

UPDATE: May 9, 2014 Add DLA-2 @95W Beam Footprints (Directv Panamericana, IS31)

UPDATE: Jun 5, 2014 Add D15 @103W Beam Footprints

UPDATE: Aug 27, 2014 Add D15 @103W Beam Footprints - per updated 8/25/14 filing

UPDATE: Apr 17, 2015 Add KU-76 @76W Two additional Beam Footprints (Directv SKY-Mexico)

UPDATE: Apr 20, 2015 Add KU-79 @76W Beam Footprint (Directv SKY-Mexico)

UPDATE: Oct 21, 2015 TPN Map 'LIL' tab adds Beam Name reference for each channel

UPDATE: Apr 10, 2016  Update all D11 'Derived'  Beam Footprints

UPDATE: Apr 11, 2016  Update all D12 Beam Footprints

UPDATE: Apr 12, 2016  Update all D14 Beam Footprints

 


Index to the Beam Footprint Library Files

 

     KU45 @45W Beams        (Directv KU-45W / SKYB-1  SKY Brazil)

 

     KU76 @76W Beams         (Directv KU-76W / SKYM-2  SKY Mexico)

     KU79 @79W Beams         (Directv KU-79W / RB-79W / SKYM-1  SKY Mexico)

RB-79W @79W Beams

 

    DLA-1 @95W Beams        (Directv DLA-1 / IS-30  Latin America)

    DLA-2 @95W Beams        (Directv DLA-2 / IS-31  Latin America)

 

       D11 @99W Beams

      D11 @99W  Beams         (Derived Footprints)

       D14 @99W Beams

      RB-1 @99W Beams          (D14)

      SW2 @99W Beams         (no longer in service)

 

     D4S @101W Beams

       D5 @110W Beams

       D8 @101W Beams

     D9S @101W Beams

 

     D10 @103W Beams

     D12 @103W Beams

     D15 @103W Beams         (Updated FCC Filing 8/25/14)

    SW1 @103W Beams

    RB-2 @103W Beams         (D15)

  RB-2A @103W Beams         (D12)

 

     D1R @109W Beams         (no longer in service)

 

     D7S @119W Beams


June 2011

This library replaces the original Beam Footprints begun in August, 2009. Those original Beam Footprints were provided as static JPG files. This new generation of Beam Footprints is presented as GoogleEarth media, allowing the viewer an unlimited interactive ability to modify the data display. Thanks to Doug Brott for his support in providing a repository for all this data.

 
 

Viewing this data requires the Google Earth application. The free application is available at
http://www.google.co...rth/download/ge

The Satellite Beam Footprint Library is the creation of dbstalk user spear61. His initiative and creativity culminated with these Beam Footprint Maps.

The beam contour maps reflect the satellite operating at full power. Reception in this case is probably good out to the isobars in the low 50’s dBw.

 


comments from spear61 August, 2009
Background
The FCC started publishing a web database in late 2003. Any original license application filed before that date only has a "marker" in the file system and does not have any online data of any kind. If one of the "old" satellites is moved to a new location after mid 2003, the modification to the original license will include the new footprint data.

Quantity of beam footprints

  • The Spaceway satellites can essentially generate an infinite number of spots. Directv received an exemption allowing them to provide a couple of "examples" in digital form in their license that show how they can blanket the country with spots.
  • Some of the other newer satellites generated so many beams that it overwhelmed the FCC filing system. Again, Directv received an exemption to only show some examples in those cases.
  • Beginning in 2009, a new database was implemented, allowing submission of more data. D12 used that format; that is the reason we have a range of data for D12. For D14 and later satellites, it appears the data for all beams is available.

  • DBSSTEPHEN and tomspeer46 like this


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#2 OFFLINE   Gary Toma

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Posted 16 June 2011 - 10:59 PM

SATELLITE DIRECTV D15  @103W  RB-2

Beam Footprint: D15_RB-2_CAK_49States
Beam Footprint: D15_RB-2_HI_Hawaii
Beam Footprint: D15_RB-2_PR_PuertoRico


#3 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:04 PM

SATELLITE DIRECTV D14 @99W  RB-1

Beam Footprint: D14_RB-1_DL1_50States_PR

Note: Update 7/27/11, Beam modified to include Puerto Rico


#4 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:08 PM

SATELLITE DIRECTV D10 @103W

Beam Footprint: D10_A1B2_Tampa
Beam Footprint: D10_A1B3_Atlanta_Chattanooga
Beam Footprint: D10_A3BB_Hawaii      (derived footprint, not part of the FCC filing)
Beam Footprint: D10_A4BB_LosAngeles
Beam Footprint: D10_DL1_49States
 
D10 is not currently providing any LIL spotbeams


#5 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:10 PM

SATELLITE DIRECTV D5 @110W

Beam Footprint: D5_PRTX_PuertoRico
 
NOTE:  11/23/13:  The previous CONUS Beam Footprint map for D5 (D5_TX1_CONUS)  has been removed and is replaced with an updated Beam Footprint map for Puerto Rico based upon Directv's recent FCC filing.


#6 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:20 PM

SATELLITE DIRECTV D8 @101W

Beam Footprint: D8_DL1_50States     (Beams T  1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31)




#7 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:22 PM

SATELLITE DIRECTV D9S @101W

Beam Footprint: D9S_101W_Beams_1-11
Beam Footprint: D9S_101W_Beams_12-20
Beam Footprint: D9S_101W_Beams_21-26

Beam Footprint: D9S_DL1_50States (Beams NAT 2, 6, 8, 10, 14, 16, 22, 24, 30, 32)

Beam Footprint: D9S_BB03_Orlando_Tampa
Beam Footprint: D9S_BB07_KansasCity
Beam Footprint: D9S_BB08_Houston
Beam Footprint: D9S_BB09_Denver_ColoradoSprings
Beam Footprint: D9S_BB10_Seattle_Portland_Yakima
Beam Footprint: D9S_BB11_LosAngeles_SanDiego
Beam Footprint: D9S_BB21_Baltimore_Washington_Harrisburg
Beam Footprint: D9S_BB22_Atlanta
Beam Footprint: D9S_BB23_Indianapolis_Chicago
Beam Footprint: D9S_BB24_Memphis

Beam Footprint: D9S_CB12_Phila_NYC_Boston
Beam Footprint: D9S_CB13_Cincy_Columbus_Dayton_Detroit
Beam Footprint: D9S_CB14_Charlot_Colmbia_Grnsboro_Grnvil
Beam Footprint: D9S_CB15_Miami_WPalmBeach
Beam Footprint: D9S_CB16_Minneapolis_Rochester_Mankato
Beam Footprint: D9S_CB17_StLouis
Beam Footprint: D9S_CB18_Austin_Dallas
Beam Footprint: D9S_CB19_Phoenix
Beam Footprint: D9S_CB20_SanFrancisco_Sacramento


Beam Footprint: D9S_RB01_Boston
Beam Footprint: D9S_RB02_Raleigh
Beam Footprint: D9S_RB04_Pittsburgh
Beam Footprint: D9S_RB05_Chicago_Milwaukee
Beam Footprint: D9S_RB06_Nashville_Birmingham_Huntsville
Beam Footprint: D9S_RB25_SanAntonio_Laredo
Beam Footprint: D9S_RB26_SaltLakeCity


#8 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:32 PM

SATELLITE DIRECTV D12 @103W RB-2A

Beam Footprint: D12_RB-2A_DL1_Alaska
Beam Footprint: D12_RB-2A_DL2_Seattle
Beam Footprint: D12_RB-2A_DL3_SaltLake
Beam Footprint: D12_RB-2A_DL4_ElPaso


#9 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:36 PM

SATELLITE SPACEWAY 1 @103W

Beam Footprint: SW1_DLA_Conus


#10 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:37 PM

SATELLITE SPACEWAY 2 @99W

Beam Footprint: SW2_DLA_Conus


#11 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:39 PM

SATELLITE DIRECTV D11 @99W

Beam Footprint: D11_A1B1_FCC_NewYork_Boston
Beam Footprint: D11_A1B7_FCC_Duluth_Minneapolis_Mankato
Beam Footprint: D11_A1B9_FCC_ColoradoSprings
Beam Footprint: D11_DL1_49States
 
The D11 FCC filing provided only those Beam Footprints above.
 
However, D11 does provide a full complement of LIL Spot Beams.  The D11 Spot Beams are all numbered just as the D12 Beams and provide a footprint north and east of their counterpart D12 Beams.   See the posting in this thread for D11-Derived Footprints.


#12 OFFLINE   Gary Toma

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Posted 16 June 2011 - 11:47 PM

SATELLITE DIRECTV D12 @103W

Beam Footprint: D12_103W_Antenna_1
Beam Footprint: D12_103W_Antenna_2
Beam Footprint: D12_103W_Antenna_3
Beam Footprint: D12_103W_Antenna_4

 

Beam Footprint: D12_A1B1_Baltimore_Harrisburg_WilkesBarre
Beam Footprint: D12_A1B2_Tampa
Beam Footprint: D12_A1B3_Atlanta_Chattanooga
Beam Footprint: D12_A1B4_Chicago_Peoria
Beam Footprint: D12_A1B5_Houston
Beam Footprint: D12_A1B6_Sherman
Beam Footprint: D12_A1B7_Fargo_SiouxFalls
Beam Footprint: D12_A1B8_Mexico_Not_Usable
Beam Footprint: D12_A1B9_Albuquerque      (Available for Re-Use)

Beam Footprint: D12_A1BA_IdahoFalls_TwinFalls
Beam Footprint: D12_A1BB_LosAngeles_SantaBarbara
Beam Footprint: D12_A1BC_Bend_Eugene_Medford

 

Beam Footprint: D12_A2B1_Philadelphia
Beam Footprint: D12_A2B2_Orlando
Beam Footprint: D12_A2B3_Cuba_Not_Usable
Beam Footprint: D12_A2B4_Knoxville_GreenvilleSC
Beam Footprint: D12_A2B5_Detroit_Flint
Beam Footprint: D12_A2B6_StLouis_Paducah
Beam Footprint: D12_A2B7_GOM_Not_Usable
Beam Footprint: D12_A2B8_Dallas_Tyler_Waco
Beam Footprint: D12_A2B9_Lincoln_Omaha
Beam Footprint: D12_A2BA_Denver
Beam Footprint: D12_A2BB_Phoenix
Beam Footprint: D12_A2BC_Boise
Beam Footprint: D12_A2BD_SanFrancisco

 

Beam Footprint: D12_A3B1_Albany_Hartford
Beam Footprint: D12_A3B2_Jacksonville_Savannah
Beam Footprint: D12_A3B3_Cleveland_Youngstown
Beam Footprint: D12_A3B4_Memphis
Beam Footprint: D12_A3B5_Milwaukee
Beam Footprint: D12_A3B6_Topeka_StJoseph
Beam Footprint: D12_A3B7_SanAntonio
Beam Footprint: D12_A3B8_Billings
Beam Footprint: D12_A3B9_Tucson
Beam Footprint: D12_A3BA_Fresno
Beam Footprint: D12_A3BB_Hawaii

 

Beam Footprint: D12_A4B1_Raleigh_E-NC
Beam Footprint: D12_A4B2_FortMyers
Beam Footprint: D12_A4B3_Buffalo_Rochester_Syracuse
Beam Footprint: D12_A4B4_Louisville
Beam Footprint: D12_A4B5_NewOrleans
Beam Footprint: D12_A4B6_CedarRapids_Davenport
Beam Footprint: D12_A4B7_Dallas
Beam Footprint: D12_A4B8_RapidCity
Beam Footprint: D12_A4B9_Texas_Not_Usable
Beam Footprint: D12_A4BA_Utah      (Available for Re-Use)

Beam Footprint: D12_A4BB_LosAngeles
Beam Footprint: D12_A4BC_Medford
Beam Footprint: D12_A4BD_Alaska_Not_Usable

 

Beam Footprint: D12_DL1_49States




#13 OFFLINE   Gary Toma

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Posted 18 June 2011 - 12:50 AM

SATELLITE DIRECTV D14 @99W

Beam Footprint: D14_99W_A_LHCP_Beams
Beam Footprint: D14_99W_A_RHCP_Beams
Beam Footprint: D14_99W_B_LHCP_Beams
Beam Footprint: D14_99W_B_RHCP_Beams
 
Beam Footprint: D14_A01L_GreenvilleNC
Beam Footprint: D14_A02L_Binghamton_Elmira_Utica
Beam Footprint: D14_A03R_Harrisonburg_Roanoke
Beam Footprint: D14_A04R_Erie
Beam Footprint: D14_A05L_Bluefield_CharlestonWV
Beam Footprint: D14_A06L_Augusta-ColumbiaSC
Beam Footprint: D14_A07L_Gainesville
Beam Footprint: D14_A08R_Albany_Columbus_Macon
Beam Footprint: D14_A09R_FortWayne_Lima
Beam Footprint: D14_A10L_Dothan_Montgomery
Beam Footprint: D14_A11L_Evansville_TerreHaute
Beam Footprint: D14_A12R_Columbus-Tupelo_Meridian
Beam Footprint: D14_A13R_Marquette      (Unused)
Beam Footprint: D14_A14R_ColumbiaMO_Quincy
Beam Footprint: D14_A15L_Monroe
Beam Footprint: D14_A16R_Shreveport
Beam Footprint: D14_A17R_SiouxCity
Beam Footprint: D14_A18L_OklahomaCity_Wichita
Beam Footprint: D14_A19R_Abilene      (Unused)
Beam Footprint: D14_A20R_SaltLakeCity
Beam Footprint: D14_A21R_Anchorage
Beam Footprint: D14_A22L_Rockford      (Unused)
 
Beam Footprint: D14_B01R_Bangor
Beam Footprint: D14_B02L_Utica_Watertown
Beam Footprint: D14_B03L_Salisbury      (Unused)
Beam Footprint: D14_B04R_Charlottesville_Johnstown
Beam Footprint: D14_B05R_MyrtleBeach_Wilmington
Beam Footprint: D14_B06L_Clarksburg_Parkersburg_Wheeling      (No Valid Data Filed)
Beam Footprint: D14_B07R_Tallahasee      (No Valid Data Filed)
Beam Footprint: D14_B08L_PanamaCity_Dothan
Beam Footprint: D14_B09R_Lexington_TriCities
Beam Footprint: D14_B10L_Lansing
Beam Footprint: D14_B11L_Chattanooga_Huntsville
Beam Footprint: D14_B12L_Hattiesburg
Beam Footprint: D14_B13R_Champaign
Beam Footprint: D14_B14R_Greenwood_Jackson
Beam Footprint: D14_B15L_Jonesboro
Beam Footprint: D14_B16L_Ottumwa      (Unused)
Beam Footprint: D14_B17L_Beaumont_LakeCharles      (Unused)
Beam Footprint: D14_B18R_OklahomaCity_WichitaFalls
Beam Footprint: D14_B19L_Amarillo_Lubbock
Beam Footprint: D14_B20R_Albuquerque
Beam Footprint: D14_B21L_Portland      (Unused)
Beam Footprint: D14_B22R_Reno      (Unused)
 
Beam Footprint: D14_B23L_B24R_PuertoRico
 
Beam Footprint: D14_C01RL_Hawaii
 
Beam Footprint: D14_NATL_49States


#14 OFFLINE   Gary Toma

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Posted 30 June 2011 - 06:41 PM

SATELLITE DIRECTV D4S @101W

D4S_101W_Beams_1-11
D4S_101W_Beams_12-20
D4S_101W_Beams_21-26

D4S_TCON_50States

D4S_S01_Boston
D4S_S02_Raleigh
D4S_S03_Orlando_Tampa
D4S_S04_Pittsburgh
D4S_S05_Chicago_Milwaukee
D4S_S06_Nashville_Birmingham_Huntsville
D4S_S07_KansasCity
D4S_S08_Houston
D4S_S09_Denver_ColoradoSprings
D4S_S10_Seattle_Portland_Yakima
D4S_S11_LosAngeles_SanDiego
D4S_S12_Phila_NYC_Boston
D4S_S13_Cincy_Columbus_Dayton_Detroit
D4S_S14_Charlot_Colmbia_Grnsboro_Grnvil
D4S_S15_Miami_WPalmBeach
D4S_S16_Minneapolis_Rochester_Mankato
D4S_S17_StLouis
D4S_S18_Austin_Dallas
D4S_S19_Phoenix
D4S_S20_SanFrancisco_Sacramento
D4S_S21_Baltimore_Washington_Harrisburg
D4S_S22_Atlanta
D4S_S23_Indianapolis_Chicago
D4S_S24_Memphis
D4S_S25_SanAntonio_Laredo
D4S_S26_SaltLakeCity

#15 OFFLINE   Gary Toma

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Posted 07 July 2011 - 03:16 PM

SATELLITE DIRECTV D7S @119W
 
Beam Footprint:  D7S_119W_Beams_B01-B07
Beam Footprint:  D7S_119W_Beams_C31-C39
Beam Footprint:  D7S_119W_Beams_R11-R23
 
Beam Footprint:  D7S_NAT_50States
 
Beam Footprint:  D7S_B01_Buffalo_WilkesBarre
Beam Footprint:  D7S_B02_Norfolk_WilmingtonNC
Beam Footprint:  D7S_B03_Paducah
Beam Footprint:  D7S_B04_Duluth
Beam Footprint:  D7S_B05_OklahomaCity_Tulsa_Wichita
Beam Footprint:  D7S_B06_Tucson
Beam Footprint:  D7S_B07_Chico_Reno
 
Beam Footprint:  D7S_C31_Hartford_Portland_Prov_Springfld
Beam Footprint:  D7S_C32_Jacksonville_Savannah_Tallahasee
Beam Footprint:  D7S_C33_Charleston_Lexington_Knoxville
Beam Footprint:  D7S_C34_NOrleans_BatonRg_Jacksn_Lafayet
Beam Footprint:  D7S_C35_Flint_GrandRapids_Lansing_SoBend
Beam Footprint:  D7S_C36_DesMoines_Omaha
Beam Footprint:  D7S_C37_Albuquerque_ElPaso
Beam Footprint:  D7S_C38_Bakrsfld_Frsno_Montrey_SantaBarbara
Beam Footprint:  D7S_C39_Spokane_Yakima
 
Beam Footprint:  D7S_R11_Albany_Rochester
Beam Footprint:  D7S_R12_Richmond_Roanoke
Beam Footprint:  D7S_R13_FtMyers-Naples
Beam Footprint:  D7S_R14_Mobile-Pensacola
Beam Footprint:  D7S_R15_Dayton_Indianapolis_Louisville
Beam Footprint:  D7S_R16_LittleRock_Shreveport_Tyler
Beam Footprint:  D7S_R17_GreenBay_Madison
Beam Footprint:  D7S_R18_CorpusChristi_Harlingen_Laredo
Beam Footprint:  D7S_R19_Topeka
Beam Footprint:  D7S_R20_Fargo
Beam Footprint:  D7S_R21_S-Colorado-unused
Beam Footprint:  D7S_R22_LasVegas
Beam Footprint:  D7S_R23_Eugene_Medford


#16 OFFLINE   Gary Toma

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Posted 09 July 2011 - 03:48 PM

SATELLITE D1R @72.5W

Beam Footprint: D1R_Conus


EDIT: a 12/5/2011 filing with the FCC requests moving D1R to the 109.8 W slot.

EDIT: a 5/8/2012 filing with the FCC requests moving D1R to provide programming for Russia. The full thread for this move is here: http://www.dbstalk.c...ad.php?t=204856


Edited by gct, 17 April 2013 - 04:21 PM.



#17 OFFLINE   Gary Toma

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Posted 28 July 2011 - 02:50 PM

SATELLITE DLA-1 / INTELSAT-30 @95W

Beam Footprint: IS30_CBCL
Beam Footprint: IS30_PRLD
Beam Footprint: IS30_PRRD
Beam Footprint: IS30_R1LD
Beam Footprint: IS30_R1RD
Beam Footprint: IS30_R2LD
Beam Footprint: IS30_R2RD
Beam Footprint: IS30_R3LD
Beam Footprint: IS30_R3RD
Beam Footprint: IS30_R4LD
Beam Footprint: IS30_R4RD
Beam Footprint: IS30_TCNL




#18 OFFLINE   Gary Toma

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Posted 30 July 2011 - 01:06 PM

SATELLITE DIRECTV KU76 @76W / SKY-Mexico-2

Beam Footprint: Mexico_TXH
Beam Footprint: Mexico_TXV
Beam Footprint: Mexico_TBL
Beam Footprint: Mexico_TKH
 
Update:  4/26/2016

#19 OFFLINE   Gary Toma

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Posted 31 July 2011 - 12:47 AM

SATELLITE  DIRECTV KU45 @45W SKY-Brazil-1

Beam Footprint: KU-45W_T1H_Brazil
Beam Footprint: KU-45W_T2H_Brazil
Beam Footprint: KU-45W_T2V_Brazil
Beam Footprint: KU-45W_TXV_Brazil




#20 OFFLINE   levibluewa

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Posted 01 August 2011 - 08:36 PM

I'm assuming that the color rings indicate the dish size needed in order to access the signal...did I miss the posting that shows the color legend.

#21 OFFLINE   doctor j

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Posted 05 August 2011 - 12:03 PM

I'm assuming that the color rings indicate the dish size needed in order to access the signal...did I miss the posting that shows the color legend.


spears61 is the spotbeam expert.
the old document did have a legend for the rings.
I cannot find my original notes but reviewing the data i believe the center point is 0dB gain or the predicted EIRP of the beam in question.

the rings are power losses from the center
White = -2 dB
Blue = -4 dB
Green = -6 dB
Pink =-8 dB
Yellow = -10 db
Orange = -15 dB
Red = -20 dB

This does correlate with the size reflector/ dish needed for adequate reception but is not indicative of specific size needed.

My "ballpark" guesstimates are that inside the Pink ring is adequate for standard slimline dish reception.
Outside or approaching Red ring may push the limits of the DTVAH 1.2 Meter dish.

Maybe others can give exact dB conversions /explanations.

Doctor j

MFH-2 System : 2 Major Viewing Areas. 2 x HR20-700's & H21 in each area via E2/SWM-8. Hardwire gigabit switch to 30 mb/sec internet.


#22 OFFLINE   Gary Toma

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Posted 05 August 2011 - 03:01 PM

Sorry to be responding so late.

With the new interactive displays, zoom in and watch closely. You'll see the isobars are all labeled with the signal strength they represent. The labels indicate signal strength in dBw; that's yet another topic.

For our purposes, the signal is really 'usable' out to approximately a signal level of 50 dBw, which is usually a pink or white band. (But always, always, check the isobar label.)

A big caveat: the charts are very accurate, but assume the satellite is transmitting at full power. However, adjusting the signal power is one way the broadcaster can control the beam. In addition, many other factors can impact the decision of how much power to use.

There is nothing wrong with Doctor J's memory!!

:)


#23 OFFLINE   doctor j

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Posted 06 August 2011 - 07:47 AM

These sites can give more insight.
Assume center point 59 to 60 dBw and rings reduce as above.

http://www.kvh.com/P...ision-Maps.aspx

http://www.sadoun.co...n/Dish-Size.htm

KA reception may need 1 or 2 "steps" up in size to prevent serious "minor" weather problems.

Doctor j

MFH-2 System : 2 Major Viewing Areas. 2 x HR20-700's & H21 in each area via E2/SWM-8. Hardwire gigabit switch to 30 mb/sec internet.


#24 OFFLINE   spear61

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Posted 18 August 2011 - 10:21 AM

spears61 is the spotbeam expert.
the old document did have a legend for the rings.
I cannot find my original notes but reviewing the data i believe the center point is 0dB gain or the predicted EIRP of the beam in question.


Doctor j


Each satellite is unique in that the Maximum dBw strength at the center point will vary. And each filing may have different ranges. But, in general, the filings are for 0, -2,-4,-6,-8, -10,-15, and -20

Remember, a 3dBw change reflects a factor of 2, either double or 1/2 signal strength and you are working with logrithmic data so you either add or subtract to calculate totals ; ie a change of 6 is equal to a change by a factor of 4 for absolute signal strength.

You will find the dBw level somewhere on each isodBw bar east or west of the center point. The macro runs thru the data points and places the digital data point at the first location within +/- 2 degrees latitude of the center point as it increments thru the lat/long points for each curve.

I prefer to use the left side panal to open the index. The center point, and all curves are labeled by both color, name, and dBw number in that panal (all done automatically by the Google Earth guys).

Mix and match satellites, beams, and dBw levels by toggle to get a view of you area.

Remember. A standard Directv antenna probably will have solid reception for anything above 50 dBw.

#25 OFFLINE   gwade

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Posted 19 August 2011 - 04:09 PM

Trying to understand the maps and getting a bit confused. I'm in the South San Francisco Bay Area, but I see two D3 spot beam maps: one for San Francisco (D12 A2BD) and one for San Jose (D12 A3BA). I'm certainly closer to San Jose (a few miles) than San Francisco. What Spot Beam would I be receiving HD locals from then?

Only reason I'm asking is because the San Jose spot beam seems to be pointed farther east with a pretty strong signal in Lake Tahoe...not that that particular piece of information is germane to the question. :)

The San Francisco spot beam is clearly farther west, with a very weak (if not receivable) signal in Tahoe.

Thoughts from you experts out there?




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