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Guest Message by DevFuse

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Interactive Beam Footprint Library


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132 replies to this topic

#121 OFFLINE   P Smith

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Posted 23 May 2014 - 10:30 PM

that's outcome of SW-1/2 co-location with D110/11/12 ... check with Gary the middle freqs of 6 tpns at SW-1/2



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#122 OFFLINE   HoTat2

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Posted 25 May 2014 - 04:23 AM

that's outcome of SW-1/2 co-location with D110/11/12 ... check with Gary the middle freqs of 6 tpns at SW-1/2

According to the Schedule S documents for the Spaceways, the tp. center frequencies for "Bent Pipe" mode are simply at multiples of 62.5 MHz, with half this bandwidth or 31.25 MHz on the upper and lower band edges.  
 
19731.25 MHz
19793.75 MHz
19856.25 MHz 
19918.75 MHz
19981.25 MHz
20043.75 MHz
20106.25 MHz
20168.75 MHz
 
Tps. 1 - 6 marked in red (two tps. per freq.).
 
Which the above must mean that in order to use all 6 transponders aboard SW1, either tp. pair 9/10 (centered at 19890 MHz) on D12 can't be used due to overlap or tp. pair 5/6 on SW1 is offset from it's center to somewhere toward the lower edge of its assigned band.
 
But I think it's more likely only tps. 1-4 on SW1 (or the first two frequencies in red) can be used as at present with tp pair 9/10 of D12 active.   

Edited by HoTat2, 25 May 2014 - 04:36 AM.

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#123 OFFLINE   slice1900

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Posted 25 May 2014 - 05:36 AM

The center frequencies for the physical transponder don't matter, it is the center frequency of the 36 MHz wide signals they're broadcasting today that matter. Do they have a 36 MHz wide signal centered on those frequencies, or are they using several of those 62.5 MHz tpns to broadcast a larger number of 36 MHz wide signals centered along the usual Ka plan? I think we'd need a spectrum analyzer's output to answer that.

 

I believe the schedule S just describes the hardware and what it is capable of. If they need to file amendments as the use of that hardware changes, there should be an amended schedule S filing that describes 36 MHz wide signals somewhere. If they don't mention that anywhere, I think it is just telling us what the hardware can do, which we already know, not telling us how it is being used today.


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#124 OFFLINE   HoTat2

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Posted 25 May 2014 - 04:47 PM

The center frequencies for the physical transponder don't matter, it is the center frequency of the 36 MHz wide signals they're broadcasting today that matter. Do they have a 36 MHz wide signal centered on those frequencies, or are they using several of those 62.5 MHz tpns to broadcast a larger number of 36 MHz wide signals centered along the usual Ka plan? I think we'd need a spectrum analyzer's output to answer that.

 

I believe the schedule S just describes the hardware and what it is capable of. If they need to file amendments as the use of that hardware changes, there should be an amended schedule S filing that describes 36 MHz wide signals somewhere. If they don't mention that anywhere, I think it is just telling us what the hardware can do, which we already know, not telling us how it is being used today.

But what is hard to understand there is unless they are treated as physically distinct 62.5 MHz wide transponders, how can they be individually assigned to distinct spotbeams for up/and downlink?

 

That is to say, how can a 36 MHz wide 36M0G7W transmission straddling one of the 62.5 MHz demarcations in your prior example be assigned to an actual spotbeam? 


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#125 OFFLINE   slice1900

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Posted 25 May 2014 - 08:50 PM

But what is hard to understand there is unless they are treated as physically distinct 62.5 MHz wide transponders, how can they be individually assigned to distinct spotbeams for up/and downlink?

 

That is to say, how can a 36 MHz wide 36M0G7W transmission straddling one of the 62.5 MHz demarcations in your prior example be assigned to an actual spotbeam? 

 

Ah yes, that is a big problem isn't it! So I guess it must be wasting spectrum and using only 36 MHz out of each 62.5 MHz transponder.

 

Which is why I wondered about this, since it would seem to make sense for Directv to take SW2 off spotbeam duty once D14 is fully operational. Otherwise they'll effectively be wasting 1/6 of their Ka hi bandwidth from 99.


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#126 OFFLINE   P Smith

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Posted 25 May 2014 - 09:28 PM

same for 103W with SW-1 ... any tpn for DTH signal in Ka coming as 36 MHz bands


Edited by P Smith, 25 May 2014 - 09:30 PM.


#127 OFFLINE   Gary Toma

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Posted 04 June 2014 - 03:29 PM

Yes, 'spear61' is on top of things...

 

He is aware of the D15 Satellite filing and hopes to have our Beam Footprints ready in the next few days.




#128 OFFLINE   Gary Toma

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Posted 05 June 2014 - 03:30 PM

SATELLITE DIRECTV 15 @103W

Beam Footprints added 6/5/2014

EDIT: 7/16/14 - Deleted Original Single BSS Beam, added three

new BSS Beams in accordance with supplemental filing.

 

EDIT: 7/20/14 - Added KBUS_ConusPlus KA Beam



Beam Footprint: D15_KaHI_Hawaii
Beam Footprint: D15_KaPR_Puerto_Rico
Beam Footprint: D15_KaUS_ConusPlus

Beam Footprint: D15_KBUS_ConusPlus_KA
Beam Footprint: D15_CAK_BSS_Continental
Beam Footprint: D15_KuHI_Ku_Hawaii
Beam Footprint: D15_KuPR_Puerto_Rico
Beam Footprint: D15_KuUS_ConusPlus

Beam Footprint: D15 HI BSS Hawaii

Beam Footprint: D15 PR BSS Puerto Rico
 




#129 OFFLINE   HoTat2

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Posted 16 July 2014 - 01:14 PM

SATELLITE DIRECTV 15 @103W

Beam Footprints added 6/5/2014



Beam Footprint: D15_KaHI_Hawaii
Beam Footprint: D15_KaPR_Puerto_Rico
Beam Footprint: D15_KaUS_ConusPlus
Beam Footprint: D15_KBUS_ConusPlus_BSS
Beam Footprint: D15_KuHI_Ku_Hawaii
Beam Footprint: D15_KuPR_Puerto_Rico
Beam Footprint: D15_KuUS_ConusPlus
 

Hey Gary;

 

Note of correction here;

 

It seems DIRECTV filed a little later on 6/12/14 for a modification to the RB-2 license so the RDBS payload antenna aboard D15 will be multi-beam to cover ConusPlus, PR, and HI., as well like with the Ka and Ku payload antennas are.

 

http://licensing.fcc...ing_key=-265801

 

So no longer just the single beam "D15 KBUS ConusPlus BSS" in the earlier D15 filing marked in red above.

 

Perhaps you can notify spear61 that three new plots are needed for downlink beams of "GXT1," "2", and "3" from the link above to correct the single BSS (RDBS) beam entry for D15 here as well as for RB-2 on page 1.

 

Their should be a similar filing for a modification to RB-1's antenna as well I would think. But I can't find one.

 

I also think it's pretty safe now to drop Mexico and S.A. beam from both the RB-1 and 2 entries on page 1 as they appear to be only for the CONUS+, HI, and PR.   


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#130 OFFLINE   Gary Toma

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Posted 16 July 2014 - 05:55 PM

The D15 Beam Footprint (Post #128) has been updated with the three new BSS Beam Footprints.  How is THAT for a speedy response??   Yes - thank you once again, spear61 !

 

One new feature begun with these three new BSS Beam Maps that some folks (translated: HoTat2) should really enjoy:

 

While displaying the Beam Footprint, open up the GoogleEarth 'Sidebar' display.   [View/Sidebar]   There in the Sidebar you will see a "Space Station Call Sign" displayed.  For D15, for instance, it is 2712.  Clicking that call sign link will take you to the FCC filing documentation from which the Beam Footprint was derived.  It is a neat way of linking the FCC documentation and the resultant Beam Footprints.

 

And yes, we will be working at building in those FCC links to all our existing Beam Footprint displays.


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#131 OFFLINE   HoTat2

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Posted 19 July 2014 - 12:27 PM

The D15 Beam Footprint (Post #128) has been updated with the three new BSS Beam Footprints.  How is THAT for a speedy response??   Yes - thank you once again, spear61 !

 

One new feature begun with these three new BSS Beam Maps that some folks (translated: HoTat2) should really enjoy:

 

While displaying the Beam Footprint, open up the GoogleEarth 'Sidebar' display.   [View/Sidebar]   There in the Sidebar you will see a "Space Station Call Sign" displayed.  For D15, for instance, it is 2712.  Clicking that call sign link will take you to the FCC filing documentation from which the Beam Footprint was derived.  It is a neat way of linking the FCC documentation and the resultant Beam Footprints.

 

And yes, we will be working at building in those FCC links to all our existing Beam Footprint displays.

Hey Gary;

 

Many thanks for the work of you and spear61 on this so far.

 

Sorry to be a PITA though, but unfortunately I don't think we're quite out of the woods yet on this. :)

 

Carefully re-reading the narrative and studying the newly posted Schedule S for D15 in pdf. format, it seems that the Ka band CONUS+ has two distinct beams (surely completely overlapping of course) for the Ka A and B (or hi and lo) transponder sets respectively.

 

http://licensing.fcc...ing_key=-265083

 

See the "Schedule S Tech Report," also note the beam_ids for GXT 1 ("KBUS") and 2 ("KAUS")

 

From the Narrative P. 7

 

... Any Ka-band uplink channel, the technical details of which 

(i.e., center frequency, polarization, bandwidth) are included in the accompanying 
Schedule S as channels AR001-AR024 and BR001-BR014, can be received in either 
uplink spot beam defined in the Schedule S (i.e., beams KALA and KACR). The 
corresponding downlink channels AT001-AT024, whose technical details are also 
included in the accompanying Schedule S, are retransmitted in beams KAUS, KAHI, and 
KAPR, and likewise the channels BT001-BT014 are transmitted in beams KBUS, KAHI, 
and KAPR. Because of the national downlink coverage, each channel can be used only 
once. 
 
DIRECTV-15 Beams.png
 
So correct me if I'm reading this wrong, but it appears the D15's Ka downlink beam designations are;
 
KAU - "Ka A-Band U.S.?"
 
KBU - "Ka B-Band U.S.?"
 
KAHI - "Ka Band Hawaii?" (i.e. A single beam for both Ka A and B bands)
 
KAPR - "Ka Band Puerto Rico?" (Again, means a single beam for both Ka A and B bands)

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#132 OFFLINE   Gary Toma

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Posted 20 July 2014 - 04:01 PM

Just added the link

 

Beam Footprint: D15_KBUS_ConusPlus_KA

 

To the D15 Beam Footprint posting, #128.

 

The spear61 note:  relabeled KBUS for correct band frequency and added the link to FCC documentation.  Still working to automate building in documentation links to all existing beam footprints.




#133 OFFLINE   Gary Toma

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Posted 24 July 2014 - 01:58 PM

A good reference from spear61:

 

You will see all kinds of different descriptions of  the new frequencies in the filings and forum posts.  A real mix of descriptions for the same bands and can get confusing.

 
When in doubt, use the FCC technical definitions.
 
For reference, the definitions as specified in Title 47 of the US Code are:
 
 

12/14 GHz bands. The 11.7-12.2 GHz Fixed-Satellite Service (FSS) space-to-Earth band and the 14.0-14.5 GHz Fixed-Satellite Service Earth-to-space band.

 

17/24 GHz Broadcasting-Satellite Service (17/24 GHz BSS). A radiocommunication service involving transmission from one or more feeder-link earth stations to other earth stations via geostationary satellites, in the 17.3-17.7 GHz (space-to-Earth) (domestic allocation), 17.3-17.8 GHz (space-to-Earth) (international allocation) and 24.75-25.25 GHz (Earth-to-space) bands. For purposes of the application processing provisions of this part, the 17/24 GHz BSS is a GSO-like service. Unless specifically stated otherwise, 17/24 GHz BSS systems are subject to the rules in this part applicable to FSS.

 

Direct Broadcast Satellite (DBS) Service. A radiocommunication service in which signals transmitted or retransmitted by Broadcasting-Satellite Service space stations in the 12.2-12.7 GHz band are intended for direct reception by subscribers or the general public. For the purposes of this definition, the term direct reception includes individual reception and community reception.







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