Quote:
Originally Posted by pmb1010
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Now to try the Ku digital side with Fortec box. One thing I notice right away... Turning the Fortec box on and off (connected to the Ku port on 621) makes the picture BETTER on C band! Looks like the 920 box is not putting out enough voltage or whatever for V/H. Another issue to work out.
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I don't understand what you're comparing here? Ie are you comparing C-920/Ku-Ultra{on/off}
or
C-920/Ku-Ultra-920{on/off}
or
are you slaved via "T"/DC-block?
AND....are you watching same polarity on C and Ku???
Ie I seem to remember someone in this group running analog off the passthru without a DC block. I've always thought this was a questionable situation, and I'm wondering whether there is some interaction between the two receivers.... ie perhaps without a DC block the Ultra is pulling down the DC power on the 920, depending on the polarity being called for????
If only using the Ultra on the Ku, I'm curious about whether the same polarity is on both bands. Again, I'm stuck with the co-rotor mentality where the polarities have to be the same, and even though there was the discussion about electronic switching in these lnbfs, I wonder if there is some interaction of the voltages internal in the 621 lnbf, rather than it being a problem with the voltage put out by the 920? I've never seen it verified in the 621 documents that both C and Ku can be operated on different polarities at the same time. You'd think that you could, but maybe not???
This is when one of those JVI-10 type
signal meters (I have a Channel Master single version similar to this) would come in handy, since you'd be able to monitor voltages or currents on both C and Ku side at the same time.
Anyway... interesting.