Advice Needed University Project

[Adam792]

The one thing that I'd like to be widely available is DVB-S/S2 to DVB-T/C/T2 remodulators.

Units that do it do exist but are usually modular, extremely expensive and aimed at large hotels and blocks of flats.

I've just been to Mallorca and in the hotel I stayed in the TDT TVs had normal Spanish DVB-T as well as BBC One, BBC Two, ITV, ITV2, ITV4, Das Erste, ZDF, KiKa and 3Sat all supplied over DVB-T in this way - it must have cost them a fair bit to set this up!

There must be a way to use a computer to do most of this. You can easily filter PIDs from a bog standard DVB-S/S2 tuner card and with some work you could make something that modifies and creates multiplex data. The fun part is devising how to modulate the DVB-T signal with a suitable external device that can have the data passed to it and create a DVB-T signal.

I'm sure it could be done a lot more cheaply than the £1000s a professional system costs and could be really useful for household distribution!

 

[rolfw]

Not seen a DVB-S to DVB-T transcoder, but they would certainly be costly and probably made to order. I use DVB-T modulators for CCTV distribution, not too expensive, 1 per channel, there are also 2 channel versions available.

http://www.satelliteandaerialsupplies.com/product/?s=antiference-minimod-digital-intelligent-cofdm-modulator

 

[rolfw]

Ah, here's the very thing, not cheap I'd imagine.
http://www.zeusit.com/gestione/sear...pagout=ENG_homepage.htm.limit=1.out=html.html
http://www.promax.es/ing/products/modulators/MO-163/qpsk-to-cofdm-transmodulator

 

[Markjose]

Correct..... they do exsit.... however tgis type of project would be ex costly as unsure on how much the modulators would cost......

It seems like everyone is going down the "super" receiver route

 

[Vipersan]

There you go ..
another sat related project for you ..
Check out Huevos reply in my Gbox fix thread ..
A 'green' Diseqc Vbox positioner ..
One that switches off all but totally essential response power when not in use ..
ie powers up on receipt of a command ..on the IF cable...or via remote control.
Must have all the usual features ..
at least 100 sat positions ..
Remote control / manual positioning...or Receiver control.
BUT here is where you could score ..
Make it a dual postioner unit ..so one command can control AZ and EL ..
I have to use 2 daisy chained boxes to achieve same..and skew control storeable per sat position on the AZ part of the positioner.
Also would be nice to have a usb export/import of the eprom for saving your stored arc.
I'm sure these would sell..
Can be used as a single positioner ..with option to add Elevation control..and Energy efficient (NOT transformer based.)

rgds
VS

 

[Captain Jack]

Yes, would love a dual positioner er.. positioner! And if you add a third one.. no way to control that with a "normal" receiver, independently.

 

[battenfan]

But what dvb-t dongle supports 2.2 GHz as it is mentioned on play?

Elonics E4000, but that one seems hard to find. I've ordered one ~$10 with a R820T tuner that is supposed to do 1766 MHz and waiting for it eagerly. A commenter at the shop site claimed 1.9 GHz, we'll see.

I would love to get my hands on Great Scott Gadgets' €300 Hack-RF which does 6 GHz.
Watch his tutorial video(s), at least the first one that is up. A great introduction to sdr.
https://greatscottgadgets.com/sdr/

 

[battenfan]

Just an update. I have received the dongle but it turned out my Android device doesn't handle usb otg. Even if I can make it, it's probably too under powered anyway. What's worse, I failed to realize that I would need a humongous sample rate to see any useful spectrum. In the first video above, Hack-RF maxes out on FM-band,~20 MHz where one bottle neck would be the usb 2 port. I don't know if it's possible to make a program that tells the dongle to do the sweeping but that is over my head for now.

 

[battenfan]

Rather than spend €100 on a meter, I've spent +€300 on a HTC mini 2 and I'm not even close to measure satellite signals yet. One drawback of this phone is that it doesn't take charge in usb otg mode. The cable is tested fine on another phone.

 

[Markjose]

Hello Guys,

Just a quick update,

Due to pricing the University regulations, I was unable to create anything satellite based.

Instead here is the application which was made:
HEVC transcoder with MPEG TS streaming. All packaged on a VM with an attractive GUI

Let me first say how difficult PHP is to understand !

So first thoughts ?

 

[Markjose]

Hello Guys,

Just an update, I competed this project and obtained a first class degree for the project

Regards,

Mark

 

[Captain Jack]

Well done Mark! Any more details around this?

 

[PaulR]

Congratulations Mark. That's really well done.

What's next? Masters, doctorate or perhaps join the real world?

 

[Markjose]

What questions do you have ?

It was an application which was built on VM hardware to transcode Legacy MPEG TS applications to HEVC and then stream with a MPEG 2 Transport stream, which was then decoded by a decoder which was able to decode HEVC.

I'm more then happy to answer any questions you may have.

Paul R - I have joined the real world

 

[Channel Hopper]

What questions do you have ?

It was an application which was built on VM hardware to transcode Legacy MPEG TS applications to HEVC and then stream with a MPEG 2 Transport stream, which was then decoded by a decoder which was able to decode HEVC.

I'm more then happy to answer any questions you may have.

MPEG-H over MPEG-2 ?

 

[Markjose]

MPEG-H over MPEG-2 ?

Yes HEVC in an MPEG-2 Transport stream.