You gotta see it to believe it.
I'd go with your previous thoughts being correct.
My mate tells me he has connected multiple dreamboxes with a single dish and LNB feed. i.e. the antenna out on the first Dream is fed into the second dream and so on.
Now I thought that there is a problem with this, the key issue being the satellite Horizontal and vertical signals.
I have asked him to have one box tuned to a Horizontal channel eg TV1 and the other box set to a vertical channel eg CNBC and he says it works fine.
Can other members here kindly please advise and or supply their experience with this kind of setup...... Thanks
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You gotta see it to believe it.
I'd go with your previous thoughts being correct.
2 words checkitout
NO HOPE
As long as all the units are on either H or V then yes they would be ok but the minute the first unit in the chain was on TV1 and any other unit tried FBO they would have a blank screen due to the fact that the first unit in the chain is sending the voltage to the lnb has triggered the H and that is what will be coming into it and all others
I've never done it myself, but I've read it can be done.
You set the LNB skew out by 45 degrees. You loose a lot of signal, but it allows you to receive both polarities at the same time.
Dave
i hear that for $50 a multiswitch will solve the issue at hand.
Hi You Need a twin Lnbf
Like that
and also you need
two input multi switch like this
Thanks
Rarg
Not possible. The STB outputs 18V to set the LNB to output the horizontal polarity, and 13V to set the LNB to output the vertical polarity. If one STB was outputing 18V (because it was tuned to a channel on the horizontal transponder) and the other was outputing 13V (to get the vertical) then the higher 18V signal would override the potential of the 13V output. The LNB would have 18V DC across its output and be set to horizontal only.
It's physically impossible to have both polarities being sent down the same cable at the same time since they are sent at virtually the same frequency from the sat (only a 9MHz offset between the centre frequency of each horizontal and vertical transponder which is a quarter of the 36MHz bandwidth of each transponder).
Yeah, you would receive both at the same time but the signal couldn't be decoded since the two signals are occupying the same frequency. Only if one signal was significantly more powerful than the other could anything be decoded and you could only then receive the more powerful signal.
There is a very good reason why the bandwidth is split between horizontal and vertical polarity and that is to provide twice the capacity for the same frequency spectrum, but it's only achievable with accurate antenna orientation and correct switching between them. If the orientation isn't correct then you'll get interference that will substantially increase the BER.
I am using Above setup for many years without any problem
Thanks
Rarg
which set-up are you using rajan ?
twin lnb to multiswitch - that will work every time
cascading in/out dream to dream on single lnb - that will fail every time you are on different polarities
Hai
I mean twin lnbf With Multi Switch
Thanks
I have just changed my LNB from single to dual outputs for that reason.
Tican2
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