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Originally Posted by dtsexpert
Voltage is sent out to the lnbf from the Lnb in. I beleive whenever you open a software to watch feeds, voltage is sent out. If the card is not in used, no voltage sent out at all. No voltage from the lnb out. But remember if you decide to slave the second receiver to the card, you should turn off the lnbf power of the 2nd receiver. If not, PC will pass from the second receiver to the card, which might get card damaged permanently. Radio Shack sells DC blocker, which can be used to block the DC from the 2nd.
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I know I'm a week behind on this part of the thread, but this part interested me.
I'm using an analog (Drake-1824) to power my LNBs. I "T" off the LNB coax with RS DC blocks to protect my Drake. The coax to my digital receivers goes first to a Fortec Lifetime, then to the
Twinhan, then to a DCII receiver (4200), using the "IN/OUT" ports discussed here. Until I read this thread today, I had completely forgotten that although I have LNB voltage turned OFF on my TWINHAN, that I still had voltage turned ON on both my Lifetime and the 4200 (I needed the voltage on, on the lifetime, because the diseq switches won't work without power, and I don't think there is an option on my 4200 to turn off the voltage).
After reading this thread, I became alarmed that I might be doing some damage, even though it has been working this way fine, so I went downstairs and put a second DC block on the input of my 4200.
Then, however, I was concerned that the Lifetime receiver might be feeding voltage to the Twinhan through the IF-out port, but I measured this, and found no voltage present on the output.
This makes me think that these IF output ports must be protected by a DC block already. At least this seems to be the case with the Lifetime receiver. I'd be curious whether this was the case with the Twinhan as well. I'll check it out when I get a chance, but I'm not set up to do it right now, because I don't have power enabled on the Twinhan.
Anyway, if the Twinhan and other receivers DO use a DC block on the IF output, then it would be safe to use receivers downstream without additional use of external DC blocks, which would avoid some potential signal loss. However I guess this requires a bit of additional testing, even with my Lifetime receiver, because I'm not positive that I have DC power enabled on all my satellites. I think this question is worth further study.