Satellite TV technical question

Turkey Machine · 05-11-2009, 21:17

I don't normally have these kind of queries regarding sat-TV, as I "ordinarily" know what I'm doing. However, this one has me stumped.

I've seen Freesat boxes with LNB IN and LNB OUT sockets for the sat feed. I know that to watch or record 2 different channels you need 2 LNB IN sockets.

I have this idea of having a couple of STBs, but one passed through to the other to act as a recording box that's not Freesat, so it can receive more channels. I understand this would mean I can't change channels on that box, and to a point I wouldn't want to, but can somebody confirm this? So if one box has one feed, an LNB pass-through, and the other box takes in this pass-through, does it still receive a signal and how would that work?

**Kymmy** · 05-11-2009, 21:46

You can change channels, just not though to a channel of a different polerization (hence the need for two LNB's..(one does Horizontal, the other does vertical - It's nothing in the end to do with the frequency

)

Turkey Machine · 05-11-2009, 22:08

Explain the polarisation thing. For example, if one channel was at 10700H and I wanted to watch a channel at 10900H, would that be possible with the one LNB?

**Kymmy** · 05-11-2009, 22:12

Yes, the tuning doesn't matter as the LNB's convert the whole band but the polarization is done via a change in the LNB feed voltage.... Obviously is the main sat has the voltage holding the LNB on Horizontal then only Horizontal signals are going to be picked up so the feedthrough if it selects a Vertical channel won't get anything but will pick up the horizontal channels OK

10-11-2009, 20:45

Quote:

Originally Posted by Kymmy

You can change channels, just not though to a channel of a different polerization (hence the need for two LNB's..(one does Horizontal, the other does vertical - It's nothing in the end to do with the frequency

)

You would also be stuck with the same band (hi or lo) that the main box has selected.

**Kymmy** · 10-11-2009, 21:17

I didn't want to get too technical and normally just bring up the polarization issue as people know about that more than the tone switching of the IF

10-11-2009, 21:49

They ask a technical question and you try to protect them from the whole answer Kymmy.

At some point we have to take the training wheels off, they have to crash now and then.

**Kymmy** · 10-11-2009, 21:52

Alright for you to say that as I'm the one who tidies up the mess afterwards

10-11-2009, 22:11

If you could see the technical messes I have to clean up........