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Forums › Freeview (DVB-T/DVB-S) › Satellite viewing separate LNB's


366 posts

Ultimate Geek
Topic # 103107 30-May-2012 15:30 Send private message

I have a DishTV PVR which allows me to watch the Australian and BBC channels and the Freeview Channels but if I want to record say the BBC I cannot watch the Freeview channels even though I have two decoders in my STB.
I presume this is because I can only access one LNB at a time.
Is there any way around this short of dual feeds from Dish?






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709 posts

Ultimate Geek
  Reply # 632780 30-May-2012 18:04 Send private message

ronw: I have a DishTV PVR which allows me to watch the Australian and BBC channels and the Freeview Channels but if I want to record say the BBC I cannot watch the Freeview channels even though I have two decoders in my STB.
I presume this is because I can only access one LNB at a time.
Is there any way around this short of dual feeds from Dish?


No.

34 posts

Geek
  Reply # 634215 1-Jun-2012 15:14 Send private message

ive heard from dish tv that in later firmwares this feature will be added unknown as to when though 

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Uber Geek

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  Reply # 634228 1-Jun-2012 15:23 Send private message

There are devices called stackers that will transpose one LNB up to the 2-3GHz band to allow you to run it down a single cable, then another device at the other end moves it back down to the 1-2GHz band.

Cost plenty tho, when I looked at it, the costs of a second cable were nothing in comparison.




Richard rich.ms



366 posts

Ultimate Geek
  Reply # 634389 1-Jun-2012 20:36 Send private message

Why cannot you use some kind of diplexer to combine the two and separate them at the STB end?


richms: There are devices called stackers that will transpose one LNB up to the 2-3GHz band to allow you to run it down a single cable, then another device at the other end moves it back down to the 1-2GHz band.

Cost plenty tho, when I looked at it, the costs of a second cable were nothing in comparison.




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Master Geek
  Reply # 634402 1-Jun-2012 20:59 Send private message

Simple, just run 2 cables and use a multiswitch, 




 

807 posts

Ultimate Geek

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  Reply # 634405 1-Jun-2012 21:11 Send private message

ronw: Why cannot you use some kind of diplexer to combine the two and separate them at the STB end?

That is what a stacker is.

Oftentimes the transponder frequencies fall in the same range so diplexing them would just make a "mess". Also, with satellite signals there is usually the complexity of polarisation signalling - different voltages in the cable - and/or 22 kHz tone signalling (for LNB and/or band selection).

In this case the intermediate frequencies are possibly sufficiently separated to be diplexed if you had good band pass filters to remove the other transponders:

990MHz for 4160H BBC/AN on IS5, assuming a 5150 MHz LNB
1706 MHz for 12456H on D1, assuming a 10750 MHz (an 11300 MHz LNB results in 1156 MHz in the cable, which might be too close)
The transponders are also on the same polarisation, which is important.

Would be an interesting experiment but probably end up cheaper and more flexible in the long run to get a second cable.

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