Getting power from. . .?

[RT-Cat]

This just does not compute. The picture below shows the basic layout of the connections from the S9, through a diseqc switch, through a splitter, and on to the LNB at the big dish. In no way do I state this is a good connection. It just works, well, sort of. The 920 powers the C and Ku LNB’s at the big dish. The LNB power is “on” in the S9. The idea here was to disconnect the 920, remove the splitters, and let the S9 power the LNB’s at the big dish. The only problem with that idea is when I disconnect the 920 I loose the signal. Makes one think the 920 is powering the LNB’s. But, with the 920 connected and I turn the LNB power off at the S9, the signal also goes dead. So, why does it take both the 920 and the S9 LNB power to make this system work?
RT.

 

[Anole]

Not a complete answer, but some clues . . .

- the diseqc switch won't work without LNB power from the S9
- the LNBs may have large warm-up drift when powered ONLY through the diseqc; most of 'em apply power only to the selected LNB
- I don't know what kind of splitters you're using, but they should have diode isolation, so the two receivers can supply power, but not interact with each other

 

[FaT Air]

Yep. the S9 LNB power also powers the diseqc switch. No S9 LNB power = no switch.

 

[Mikey11]

when you disconnect the 920 are you removing the splitters?....or are you just turning it off?....if you are just turning it off then try removing the splitters and wire the lnb directly from the diseqc switch.....S9>>>diseqc switch>>>lnb and nothing more....if that fails, connect a wire directly from the S9 to the lnb without any switches and see if that works....

what kind of splitters are these?....i have never seen a wiring configuration like this....

 

[RT-Cat]

Good info here, Guys. Just checked in to see if any answers. Got to get to work. Will comment later, thanks.

RT.

 

[FaT Air]

have never seen a wiring configuration like this....

pretty standard config. A 22khz sw could replace the diseqc. Full 18v to the lnb's and servo polarity control via the 920. FTA box LNB power required to power the band select switch. One port HF DC blocking splitters. DC block port to the switch(so LNB power from one receiver doesn't back-feed into the other.) DC pass port to Analog/4DTV to power the LNB's.

 

[stone1150]

I wonder if those splitters only pass power through one side...... In this case the 920 side. Usually with a setup like that, single side power pass splitters, (diplexors), are used. I used to mess with that crap. Since I do not sub at the moment, I removed all the splitters and went direct to0 my fta receiver leaving only the 4d to move the dish. Kinda nice not having to change polarity with the 4d. Have a great day!

 

[RT-Cat]

Not a complete answer, but some clues . . .

- the diseqc switch won't work without LNB power from the S9
- the LNBs may have large warm-up drift when powered ONLY through the diseqc; most of 'em apply power only to the selected LNB
- I don't know what kind of splitters you're using, but they should have diode isolation, so the two receivers can supply power, but not interact with each other

Well, that will go down as my brain-dead question of the day. I should have asked my cat for the answer. It is that simple.
I wondered about the switch powering only the switched to LNB. Read something long, long ago it was best in the cold climate areas to always keep them “on” or warm. Is it OK not to?
They are printed with: TRU-SPEC HFS – 2/2150
900-2150 MHz splitter
1 in – 2 out. With a line from one out to the input. Maybe power path.

Yep. the S9 LNB power also powers the diseqc switch. No S9 LNB power = no switch.

See brain-dead above.

when you disconnect the 920 are you removing the splitters?....or are you just turning it off?....if you are just turning it off then try removing the splitters and wire the lnb directly from the diseqc switch.....S9>>>diseqc switch>>>lnb and nothing more....if that fails, connect a wire directly from the S9 to the lnb without any switches and see if that works....

what kind of splitters are these?....i have never seen a wiring configuration like this....

I killed everything, removed the cable from the 920 and fired up everything. And the C band station I had on was not there. No power from the 920 and must be nothing getting past the splitter or the S9 power would/should have kept the C LNB on.
The plan is to disconnect the 920, use it to move BUD and set polarity, connect S9 to one cable out to the BUD. Place a different diseqc switch at the BUD. Hook up C, Ku, and a small dish to the switch and have one port open for anything else. (Not another dish, oh, my.)
Like I stated, this was not done by a pro. But it did work.
I will “play” with this soon and post what happens. Thanks for all the “wake-me-up” info.
. . . .now where is that cat. I got a question for him. . . .
RT.

 

[RT-Cat]

Stone1150,
Moving dish with the 920, yes. But how did you change polarity without the 920? It is needed here to run the servo motor.

RT.

 

[FaT Air]

I wonder if those splitters only pass power through one side...... In this case the 920 side. Usually with a setup like that, single side power pass splitters, (diplexors), are used. I used to mess with that crap. Since I do not sub at the moment, I removed all the splitters and went direct to0 my fta receiver leaving only the 4d to move the dish. Kinda nice not having to change polarity with the 4d. Have a great day!

That would be fine if equipped with C-Ku LNBF's. But if equipped with C and Ku LNB's on a polarotor, The LNB's don't like working on only 13v(usual specs are 15 to 24Vdc for LNB's, LNBF's 13v=vertical 18v=horizontal) and most FTA boxes don't operate servos. I did the same a couple of years ago- got rid of the analog(polarity and moving chores) Installed a GBox and a LNBF, Less clutter of remotes & more user friendly.

 

[RT-Cat]

That would be fine if equipped with C-Ku LNBF's. But if equipped with C and Ku LNB's on a polarotor, The LNB's don't like working on only 13v(usual specs are 15 to 24Vdc for LNB's, LNBF's 13v=vertical 18v=horizontal) and most FTA boxes don't operate servos. I did the same a couple of years ago- got rid of the analog(polarity and moving chores) Installed a GBox and a LNBF, Less clutter of remotes & more user friendly.

Oh, Oh, from what you just stated here, the S9 is not going to be able to power the C or the Ku LNB's at my big dish, correct?

RT.

 

[FaT Air]

If you keep the FTA box on H polarity(13v=vertical 18v=horizontal), should be OK. 18Vdc is within the nominal operating supply voltage window of the LNB. Just have to remember what the actual polarity is, as selected by the 920. In my previous post it should have read "polarity, LNB powering and moving chores" Since you have the 920 moving the dish, running the polarity, might as well have it power the LNB's. (as you now have it configured)

 

[RT-Cat]

If you keep the FTA box on H polarity(13v=vertical 18v=horizontal), should be OK. 18Vdc is within the nominal operating supply voltage window of the LNB. Just have to remember what the actual polarity is, as selected by the 920. In my previous post it should have read "polarity, LNB powering and moving chores" Since you have the 920 moving the dish, running the polarity, might as well have it power the LNB's. (as you now have it configured)

OK, sounds good. Now if I wanted to get away from having the 920 change polarity and only move the BUD, a change out to say a DMX741 would be a direction to go? If a yes, I saw one at Sadoun sales. Any experience dealing with them?

RT.

 

[FaT Air]

dealing with sadoun, no problems. with a dmx741, never. I'm a kinda partial to dedicated Ku dishes.

 

[stone1150]

Stone1150,
Moving dish with the 920, yes. But how did you change polarity without the 920? It is needed here to run the servo motor.

RT.

I use a c/ku lnbf. Voltage switching no servo. I ran the servo for years and had no other way to control it other than the 4d. That being the case, The splitters, (diplexors) are made to pass power through only one side. That would be the side with the line on it. So when I used a lnb with a servo, I had the 4d hooked up completly and slaved my fta to it. That is the only way to do it with c and ku. The 4d must be hooked up to the power side of the splitters. And the power must be turned on with the fta to run the diseq. Here is a diagram....

 

[stone1150]

dealing with sadoun, no problems. with a dmx741, never. I'm a kinda partial to dedicated Ku dishes.

The dmx741 is what I run now. I simply got tired of having to use the 4d for polarity and got tired of all the switches. Now if I ever get around to taking them down off the wall, it will look so much nicer with 2000 miles less cable behind the entertainment center!

I have no trouble with Ku. It was a little trickey though initially setting it up and getting it focused.

 

[RT-Cat]

dealing with sadoun, no problems. with a dmx741, never. I'm a kinda partial to dedicated Ku dishes.

OK. Thought I saw some good comments on the 741. Nice setup you have with that "doubledish". Never gave that a thought.

The dmx741 is what I run now. I simply got tired of having to use the 4d for polarity and got tired of all the switches. Now if I ever get around to taking them down off the wall, it will look so much nicer with 2000 miles less cable behind the entertainment center!

stone1150,
I took a look at my paper print out and it matches yours. The 741 idea was just as you stated. I turn on something and it does not work. Then I remember to change the 920 from channel 24 to channel 1 to get a polarity change and the channel pops up. Good to read that you have had luck with it. I will keep thinking about it for now. My change, may not ???

THANKS to all that made comments and dropped info to look at.

RT.