[mythtv-users] DVB-S2 tuner cards for the UK

Stephen Worthington stephen_agent at jsw.gen.nz
Tue Sep 19 00:45:53 UTC 2017


On Mon, 18 Sep 2017 19:04:11 +0100, you wrote:

>Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:
>
>> That has four aerial inputs for its 8 tuners, but they go through a
>> multiswitch frontend on the card, so you can use just one aerial input
>> for all 8 tuners if you want to, which is the way I run mine here in
>> New Zealand where we only have one satellite to receive from.
>
>That doesn't work here - you NEED 4 separate inputs or you hit severe limitations on what combinations of channels you can record. I don't know about your sat services there, but here you get four different "groups" of channels - high and low band, horizontal and vertical - which are selected at the LNB according to voltages/signals sent up the cable.
>https://en.wikipedia.org/wiki/Low-noise_block_downconverter#Universal_LNB_.28.22Astra.22_LNB.29
>
>As a result, over here you need a separate cable per tuner - until you get above 4 when it's possible to use a multiswitch and quatro LNB.
>
>The alternative is to use a Unicable LNB & system - but I don't think support for them is very common.
>https://en.wikipedia.org/wiki/Low-noise_block_downconverter#Multi-output_LNBs
>
>
>So for us, you need up to 4 cables.
>On one cable, you can select one of the 4 combinations of H/L & H/V - with the other three combinations (and the channels carried on them) aren't available to the tuner(s). That's "very restricting" !

Ok, it seems that the multiswitch mode on the TBS6909 is what UK users
would want to use then:

https://www.tbsiptv.com/download/tbs6909/tbs6909_user_guide.pdf


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