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DirecTV National HD Listing/Maps Discussion Thread (Technical - Not Anticipation)


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#341 OFFLINE   P Smith

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Posted 11 July 2012 - 02:10 PM

Being who I am, I'm more interested in MHz than Mb/s


Ah, that's in FCC docs.

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#342 OFFLINE   cypherx

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Posted 11 July 2012 - 02:12 PM

I thought it was 36 MHz.. but per chance the Spaceways *MAY* have bandwidths as much as 62.5 MHz.

- > Link to my setup thread< -

My  DirecTV HD WISHLIST:  NickJR, Nicktoons, Revolt.TV, FXM, We, Oxygen, The Hub, Fuse, GSN, Sprout, GAC, Esquire, MTV2, BBC World News, Ovation, Reelz , Sundance, Up, Music Choice Play HD (formerly SWRV), Al Jazeera America, Military Channel, NASA

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#343 OFFLINE   veryoldschool

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Posted 11 July 2012 - 02:15 PM

I thought it was 36 MHz.. but per chance the Spaceways *MAY* have bandwidths as much as 62.5 MHz.

Both sound "about right".
A.K.A VOS

#344 OFFLINE   P Smith

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Posted 11 July 2012 - 02:15 PM

I thought it was 36 MHz.. but per chance the Spaceways *MAY* have bandwidths as much as 62.5 MHz.


FCC docs stats 36 MHz for Ka sats of D## series. IMO, SW could have 70 or 80 MHz tpns, but we have no docs to support that by facts.

#345 OFFLINE   doctor j

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Posted 11 July 2012 - 02:39 PM

FCC docs stats 36 MHz for Ka sats of D## series. IMO, SW could have 70 or 80 MHz tpns, but we have no docs to support that by facts.


Documents here:

http://licensing.fcc...erC/File Number

Go to "Attachment Menu" Then "Exhibit D"

I've copied a segment from page #11

"When the satellite is operated in the non-processor mode it can be viewed as supporting 8 contiguous 62.5 MHz channels"

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#346 OFFLINE   P Smith

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Posted 11 July 2012 - 02:47 PM

More interesting facts:

The satellite also includes wideband (i.e., 165 MHz) uplink and downlink channels

The emission designators of the signals to be transmitted through these channels are: 24M0G7W, 36M0G7W and 54M0G7W with associated allocated bandwidths of 24 MHz, 36 MHz and 54 MHz, respectively.

The downlink antenna for the 19.7-20.2 GHz band is a 1500 element active phased array. This array is extremely flexible and can be configured from the ground to create up to twenty-four 0.5° spot beams, a single wide area CONUS beam, or virtually any beam combination in between these two extremes.


Edited by P Smith, 11 July 2012 - 03:23 PM.


#347 OFFLINE   veryoldschool

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Posted 11 July 2012 - 03:09 PM

The downlink antenna for the 19.7-20.2 GHz band is a 1500 element active phased array. This array is extremely flexible and can be configured from the ground to create up to twenty-four 0.5° spot beams, a single wide area CONUS beam, or virtually any beam combination in between these two extremes.

While phased array can be quite flexible, The CONUS beam testing didn't turn out to be too successful.

In the end, measuring what bandwidth DirecTV is actually using might be of more use.
A.K.A VOS

#348 OFFLINE   P Smith

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Posted 11 July 2012 - 03:16 PM

Last time ( it was a few years ago) I posted these pictures ... don't recall measurements...

Just fired my SA PSA-37D ... 35..36 MHz per tpn in a range 250...750 MHz range.

#349 OFFLINE   veryoldschool

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Posted 11 July 2012 - 03:20 PM

Last time ( it was a few years ago) I posted these pictures ... don't recall measurements...

Just fired my SA PSA-37D ... 35..36 MHz per tpn in a range 250...750 MHz range.

Thanks, and I knew you'd done it before.
So now we have "facts". :)

So now that we know the BW is 36 MHz, if this is only getting 38 Mb/s, it must be using the worst modulation technique known to man.

I'm by no means an expert on types of modulation but if it's only 1 Mb/s/MHz this sounds basically primitive analog, which we know it isn't.

Edited by veryoldschool, 11 July 2012 - 03:31 PM.

A.K.A VOS

#350 OFFLINE   charlie460

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Posted 11 July 2012 - 07:37 PM

I would be curious to know what bitrate and whether or not they are using the new encoders for the Audience Network. The picture quality is quite bad on tonight's Damages premiere. Lots of artifacting.

#351 OFFLINE   sigma1914

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Posted 11 July 2012 - 07:39 PM

I would be curious to know what bitrate and whether or not they are using the new encoders for the Audience Network. The picture quality is quite bad on tonight's Damages premiere. Lots of artifacting.


They film it crappy... It's been horrible since FX days.
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#352 OFFLINE   P Smith

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Posted 11 July 2012 - 07:39 PM

I would be curious to know what bitrate and whether or not they are using the new encoders for the Audience Network. The picture quality is quite bad on tonight's Damages premiere. Lots of artifacting.


Post sat, tpn, PID and time if you want the numbers or a plot.

#353 OFFLINE   P Smith

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Posted 11 July 2012 - 07:41 PM

Thanks, and I knew you'd done it before.
So now we have "facts". :)

So now that we know the BW is 36 MHz, if this is only getting 38 Mb/s, it must be using the worst modulation technique known to man.

I'm by no means an expert on types of modulation but if it's only 1 Mb/s/MHz this sounds basically primitive analog, which we know it isn't.

Measured data rates:
for Ka, DVB-S2D, SR=30 Msps:
QPSK 3/5 35 Mbps
QPSK 2/3 39 Mbps
QPSK 4/5 47 Mbps
8PSK 3/5 52 Mbps

Edited by P Smith, 12 July 2012 - 12:20 AM.


#354 OFFLINE   charlie460

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Posted 11 July 2012 - 07:41 PM

They film it crappy... It's been horrible since FX days.


I'm not just talking about that "soft" filter look they have throughout the show, there seems to be artifacting due to what looks to me like bitrate starvation.

Post sat, tpn, PID and time if you want the numbers or a plot.


I am not sure how to find the PID of a channel, can that be done via a serial command (using the HTTP API)?

EDIT: While I'm still curious whether that information can be determined via serial, I pulled the following information from the 7/4 excel spreadsheet here:

D10 @ 103W (103CB)
TPN: 1
TID: 124
VPID: 1050

EDIT 2: I got the following hex response for the FA83 serial command, I'm not sure how to parse this in order to get useful information:
0065FFFF1009FF10501052FFFF000F7C13070C01351604000000000000000000<removed sensitive info>

Edited by charlie460, 11 July 2012 - 11:58 PM.


#355 OFFLINE   P Smith

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Posted 11 July 2012 - 11:34 PM

Right now the PID taking 3+ Mbps, a plot will be ready in one hour.

#356 OFFLINE   P Smith

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Posted 11 July 2012 - 11:36 PM

I'm not just talking about that "soft" filter look they have throughout the show, there seems to be artifacting due to what looks to me like bitrate starvation.



I am not sure how to find the PID of a channel, can that be done via a serial command (using the HTTP API)?

EDIT: While I'm still curious whether that information can be determined via serial, I pulled the following information from the 7/4 excel spreadsheet here:

D10 @ 103W (103CB)
TPN: 1
TID: 124
VPID: 1050

EDIT 2: I got the following hex response for the FA83 serial command, I'm not sure how to parse this in order to get useful information:

0065FFFF1009FF10501052FFFF000F7C13070C01351604000000000000000000000...


Get the document here http://www.dbstalk.c...14&postcount=23; page 17:
0065 - ch# 101
FFFF - n/a
10 - video:MPEG-4/H.264
09 - audio: AC3
FF - n/a
1050 - VPID
1052 - APID
FFFF - n/a
000F - net# [15]
7C - TID [124]
13 - year + 1993 [2012]
07 - month [July]
0C - day [12] GMT
01 - hh [01] GMT
35 - mm [53] GMT
16 - ss [22] GMT
04 - weekday [Thursday] GMT
00000000 - ROM v
00000000 - STS ID
00 - STS Ver
0000...... - CARD ID 00xx-xxxx-xxxx
63 - Signal [99]
000..... - RID xxxx xxxx xxxx

Edited by P Smith, 12 July 2012 - 12:06 AM.


#357 OFFLINE   charlie460

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Posted 11 July 2012 - 11:45 PM

Right now the PID taking 3+ Mbps, a plot will be ready in one hour.


:eek2: that's quite low.

#358 OFFLINE   P Smith

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Posted 11 July 2012 - 11:47 PM

:eek2: that's quite low.


Slow raising, now is 4.72 Mbps (is channel # 101 right one ?)

#359 OFFLINE   charlie460

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Posted 11 July 2012 - 11:49 PM

Slow raising, now is 4.72 Mbps (is channel # 101 right one ?)


Yep, that's it.

#360 OFFLINE   P Smith

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Posted 11 July 2012 - 11:53 PM

I'll post the plot when the 1 hr ends. Check above my decoding of your hex response.




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