Can I use passive splitters on a quattro LNB

[Gary_Funwick]

I have a quattro LNB feeding a multiswitch. Can I use passive splitters on the VL, VH, HL, HH cables. I want to connect a Sat>IP server which only exposes all eight of its tuners when its connected to a quattro but while testing I need to keep the multiswitch in service.

If yes anything I need to look out for, frequency etc?

Thanks

 

[flameport]

No, the multiswitch supplies power to the LNB - it's not just a case of signals being received from it.

 

[Gary_Funwick]

@flameport
Don't most passive splitters pass power from one or both downstream ports? Most listed here seem to:
https://cpc.farnell.com/c/audio-visual/aerials-satellite/amplifiers-distribution/splitters-combiners

 

[flameport]

They do pass power, and that is the problem - you will have power from both the multiswitch and the extra device both attempting to power the same LNB.
Even if that problem is overcome somehow, the signal losses with be huge, and it's unlikely either device will work properly.

 

[winston1]

Yes you can use passive splitters there. Make sure they have power pass on at least one output. It does not matter if power is supplied by both sources as they are isolated with diodes in the splitter. But if you are worried use a splitter with power pass on one leg only.

The loss is not huge, it will be around 4dB for a 2 way splitter. An LNB gain is large on the other hand and 4dB won't be noticed.

 

[Gary_Funwick]

@winston1

Thanks that confirms what I suspected.

And it works perfectly in practice. The sat>IP server reports signal level at -37.9dBm FWIW.

Thanks