Satellite viewing separate LNB's

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ronw

1222 posts

Uber Geek

#103107 30-May-2012 15:30

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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xarqi

727 posts

Ultimate Geek

#632780 30-May-2012 18:04

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.

Duddyx5

51 posts

Master Geek

#634215 1-Jun-2012 15:14

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

richms

28168 posts

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#634228 1-Jun-2012 15:23

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

ronw

1222 posts

Uber Geek

#634389 1-Jun-2012 20:36

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.

Nokia 7 Plus
Nexus 6P 32Gb
Nexus 6 Phone
Nexus 5 Phone
Nexus 7 2013 Tablet
Samsung TAB A 8"
Samsung TAB A 10"

& many Windows laptops, Desktops etc

injuised

256 posts

Ultimate Geek

#634402 1-Jun-2012 20:59

Simple, just run 2 cables and use a multiswitch,

mm1352000

1149 posts

Uber Geek
Inactive user

#634405 1-Jun-2012 21:11

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.