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1  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Hughes 9202 BGAN Terminal FOR SALE
 on: Jul 10th, 2019 at 8:45pm 
Started by Fiktif | Post by Fiktif  
Anyone interested contact me.
Huge discount.

2  Anything else / General and other topics / Re: Bandwidth of SD and HD TV Channels
 on: Jul 10th, 2019 at 8:39pm 
Started by Sat_Baby | Post by Admin1  
If you have a look in lyngsat you will get some idea of how many TV channels are merged onto a high bit rate carrier.
e.g. https://www.lyngsat.com/Astra-2E-2F-2G.html

The bit rate allocated to each TV channels varies from moment to moment according to the content of the picture. A highly detailed image that suddenly changes to different highly detailed image will cause a burst of high bit rate. A steady image will have very low bit rate, once it is initially displayed. A still head on still background with lips only moving will have low bit rate. A crowd scene with camera panning might cause moderate bit rate as new image data gets inserted at the side and some people move in the crowd.

Read more: http://www.astra2sat.com/televison/tv-bitrates/

Also read this:  https://www.ofcom.org.uk/__data/assets/pdf_file/0018/27324/zetacast.pdf particularly about trends with bit rates.

Best regards, Eric.

3  Service Providers / Satellite Internet - Americas / Wanted: Newtec VSAT service in Guyana, South America
 on: Jul 9th, 2019 at 9:47am 
Started by Admin1 | Post by Admin1  
Please email me eric@satsig.net if you can provide Ku band Newtec service in Guyana, South America, compatible with Newtec MDM 2200, 2210, and/or 2500 Modems and LNB LO 9.75/10.6 GHz, BUC NTC/2536.AA 2 Watt BUC.

Ref: 9 July 2019 02:09

Thanks, Eric

4  Anything else / General and other topics / Bandwidth of SD and HD TV Channels
 on: Jul 3rd, 2019 at 5:27pm 
Started by Sat_Baby | Post by Sat_Baby  
Dear Members

How much bandwidth or data rate normally a Standard Definition (SD) and High Definition (HD) TV channel need for transmission over a satellite link with MPEG-2 and MPEG-4 compression. What are industry norms and do we have any ITU standard for this?

Thanks and regards

5  Anything else / General and other topics / Re: Bandwidth saving in Carrier-in-Carrier system
 on: Jul 3rd, 2019 at 5:21pm 
Started by Sat_Baby | Post by Sat_Baby  
Thanks Eric!

You have explained very clearly and also cleared my doubt about CnC. I had missed the point that CnC links are duplex links.


6  Anything else / General and other topics / Re: Bandwidth saving in Carrier-in-Carrier system
 on: Jul 2nd, 2019 at 7:04pm 
Started by Sat_Baby | Post by Admin1  
Each site transmits only one carrier.

The carriers superimpose when they arrive at the satellite.

On the downlink, each site receives its wanted (from far end) signal, plus a delayed version of its own transmitted signal. Since each receive site knows what it transmitted earlier it can create an equal and opposite version to cancel its own transmitted signal visible in the downlink. Thus the receive site get the full wanted signal plus a greatly suppressed version of its own transmit signal.

Note that the system requires that a C-in-C site can see its own signal via the satellite (i.e. in a looped back up/down coverage beam.)

The C-in-C system can almost double the throughput per MHz and gives big space segment cost savings when the link budgets are good enough to make C-in-C possible.

See: https://www.comtechefdata.com/technologies/doubletalk

There are a couple of links to two pdf white papers at the bottom of that page.

Best regards, Eric.

7  Anything else / General and other topics / Bandwidth saving in Carrier-in-Carrier system
 on: Jul 2nd, 2019 at 8:16am 
Started by Sat_Baby | Post by Sat_Baby  
Dear Members
My query is about stated saving of bandwidth in Carrier-in-Carrier system. Suppose two signals S1 and S2 need to be transmitted. A typical Carrier-in-Carrier system would do this by transmitting combined signal S1+S2. At the receiving end, signal S1 would be extracted by subtracting signal S2 from the received combined signal S1+S2. That is to say for Carrier-in-Carrier cancellation, it is necessary to provide each demodulator with a copy of its local modulator’s output.
Meaning thereby, it is necessary to provide a copy of signal S2 to the receiving end (probably by transmission of S2 over alternate path and media). So actually, one has to transmit S1+S2 as well as S2 to enable receiver to get S1. Please explain how does it saves bandwidth in such a scenario (of course if I have understood it correctly). I mean the net effective transmission is only S1 whereas transmit bandwidth consumed is for S1+S2 and also for S2.

Thanks and regards

8  Service Providers / Satellite Internet - India, Asia and Australia / Re: Any satellite Internet service reliable and cost effective covering India
 on: Jul 1st, 2019 at 3:08am 
Started by Arunesh | Post by Arunesh  
Thanks for your message have mailed you..

9  Anything else / General and other topics / Re: General
 on: Jun 28th, 2019 at 8:47am 
Started by salam | Post by salam  
I do miss the old contents. It was possible to get that via archive, but now it seems impossible.

Please do something otherwise please let us know that, it will not be available anymore!!!!

10  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Reliable and Cost Effective 4.5Meter VSAT Antenna For Sale From Probecom
 on: Jun 27th, 2019 at 3:40am 
Started by probecom | Post by probecom  
4.5Meter VSAT Antenna, which uses a shaped parabolic reflector, provide
s high gained exceptional pattern characteristics as well as low VSWR.
 The 4.5m antenna panels are made of stretch-formed aluminum sheet and riveted on the precise mould; such s
tructure has the characteristics of higher accuracy and strong rigidity.
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