Dual Output LNBF -> 1 Coaxial Cable -> 2 Receivers

[shrugy]

Hi All,

I have Fortec Star FSKU-2v dual output LNBF and 2 FTA receivers. However, I can only run one cable from the dish into the room where I have the receivers. Is there a splitter/joiner or a switch that can enable me to connect the two receivers to the dual output LNBF using a singal coaxial cable so that I can control each receiver independently?

Thanks.

[bobkat]

Sorry, there is no such thing. You must run two cables.

kat

[shrugy]

Hi Kat,

Thank you for the quick answer.

[elgemcdlf]

Ok what about this. Will require a seperate receiver for every channel you want to receive but accomplishes the single cable problem. Run the cable in and split it for each receiver. Tune each receiver to a specific channel then run into a modulator assigning a channel number. From there into a combiner putting all the outputs back into a single cable and into your television. Now you change channels with the TV like a cable system.

Would be much easier and cheaper to run 2 cables though Not to mention I have got major signal degradation running multiple receivers from a single output of a lnbf.

[rainman]

considering the space that the RG6 cable takes should'nt be that diffcult to run 2 cables. expecially when you consider the size of a c band ribbon cable.would recommend running a second cable.

[wejones]

Originally Posted by elgemcdlf

Ok what about this. Will require a seperate receiver for every channel you want to receive but accomplishes the single cable problem. Run the cable in and split it for each receiver. Tune each receiver to a specific channel then run into a modulator assigning a channel number. From there into a combiner putting all the outputs back into a single cable and into your television. Now you change channels with the TV like a cable system.

Would be much easier and cheaper to run 2 cables though Not to mention I have got major signal degradation running multiple receivers from a single output of a lnbf.

THe above is OK, but one receiver would have to choose the polarity, and the 2nd receiver could only tune channels on the same polarity.
However the reason I'm responding is relative to the "major signal degradation running multiple receivers from a single output" thing. I too have noticed significant loss of signal when using "most" splitters, but I get almost no noticeable degradation when using the passthroughs that most DVB receivers have.
For example, I'm using a sllitter to divide signal between my C-band and DVB receivers, and that results in nearly 50% loss of signal at times. However the signal, which goes to my Ultra then goes on to my Twinhan, and then on to either my Broadlogic or on to my DCII receiver, and there is no noticeable difference in signal strength at the DCII receiver between going through the Ultra and Twinhan vs going direct to the splitter.
So I think the above would work better by using the pass-throughs (with DC-blocks of course) than by using a splitter.
This topic has made me think, however...... I have one splitter, which instead of doing a 50/50 split, does something like an 80/20 or 90/10. Since I almost never watch analog anymore, I'm tempted to run the analog receiver through the 20% leg (assuming it will let me pass power that way, I can't remember). That way, I'll have better signal for my digital receivers.
I'm going to have to pull out my 80/20 splitter and see if that will work.

[bobkat]

Originally Posted by wejones

THe above is OK, but one receiver would have to choose the polarity, and the 2nd receiver could only tune channels on the same polarity.

Bingo.... that should be reason enough to run two cables.

kat

[elgemcdlf]

Originally Posted by wejones

THe above is OK, but one receiver would have to choose the polarity, and the 2nd receiver could only tune channels on the same polarity. ...
I'm going to have to pull out my 80/20 splitter and see if that will work.

I think you misunderstood me. You would require a different receiver for each channel you desired. What this would do is assign channel numbers for the television to each channel and combine them into one cable and the TV would change channels. So if you wanted 2 V channels you would need 2 receivers. 1 for each channel. Add 2 H channels and you need 2 more receivers. You could assign channel 5 to the first V channel, channel 6 to the second, channel 7 to the first H and so on. Now when you change the TV to channel 7 you get the first H channel from your FTA receivers in your mini cable system.

BUT again I do believe it best to feed each receiver with a seperate lnbf so that defeats the single coax deal only due to signal degradation.

Basically this concept builds a cable system. You would never touch the receivers once tuned to a channel you desired. Changing channels is handled by the TV. You also require a seperate dish for each sat you wish to receive.

[wejones]

Originally Posted by elgemcdlf

I think you misunderstood me. You would require a different receiver for each channel you desired. What this would do is assign channel numbers for the television to each channel and combine them into one cable and the TV would change channels. So if you wanted 2 V channels you would need 2 receivers. 1 for each channel. Add 2 H channels and you need 2 more receivers. You could assign channel 5 to the first V channel, channel 6 to the second, channel 7 to the first H and so on. Now when you change the TV to channel 7 you get the first H channel from your FTA receivers in your mini cable system.

....

How do you plan to get both H and V down one cable? Or do you plan to put your receivers out at the dish?

[bobkat]

Originally Posted by wejones

Or do you plan to put your receivers out at the dish?

LOL !!!

kat

[bobkat]

Originally Posted by elgemcdlf

I think you misunderstood me. You would require a different receiver for each channel you desired. What this would do is assign channel numbers for the television to each channel and combine them into one cable and the TV would change channels. So if you wanted 2 V channels you would need 2 receivers. 1 for each channel. Add 2 H channels and you need 2 more receivers. You could assign channel 5 to the first V channel, channel 6 to the second, channel 7 to the first H and so on. Now when you change the TV to channel 7 you get the first H channel from your FTA receivers in your mini cable system.

BUT again I do believe it best to feed each receiver with a seperate lnbf so that defeats the single coax deal only due to signal degradation.

Basically this concept builds a cable system. You would never touch the receivers once tuned to a channel you desired. Changing channels is handled by the TV. You also require a seperate dish for each sat you wish to receive.

So basically you're building your own little cable TV company. However, you would still need a separate cable from the LNB for each polarity. Each coax can handle either 13 or 18 volts at any given time. This is why God invented dual LNBs...

When you connect a dual LNB to a multiswitch one "side" of the LNB is locked onto 13 volts and the other side to 18 volts.

kat

[elgemcdlf]

Whoops Ok you can not do it with one cable.

[rainman]

it would be easier to buy the dual rg6 cable that sadoun sales.

[wejones]

One thing that I think would be very useful, that I'm surprised that no-one sells, would be an inline converter/combiner, that would shift the output from one LNB port up by 500MHz, then combine it with the output from the other LNB port, and send it down one coax. I think that this could be made quite cheaply, and could also drop DC voltage from 18 to 13, into the 2nd port.

If that were done, then you'd receive one polarity in the 950-1450 range of the IF, and the other polarity in the 1450-1950 range. You'd then have all the channels available without switching polarity. I have an HF version of this that I use with my Icom7000. THe 7000 doesn't receive below 25 MHz, but I have a converter that shifts everything in the 0-25MHz range up to 100-125 MHz.

I THINK that I read somewhere that some of the Dishnet switches do a conversion, switching some of their frequencies to other parts of the band, so it may be that some of this has already been created, and might be modified for FTA use.

But I guess running a second cable is easier.

[elgemcdlf]

Originally Posted by wejones

How do you plan to get both H and V down one cable? Or do you plan to put your receivers out at the dish?

Oh Bill this is so easy. Run V down the center wire and H down the braid on the outside LMAO

[wejones]

Originally Posted by elgemcdlf

Oh Bill this is so easy. Run V down the center wire and H down the braid on the outside LMAO

I should have thought of that. :-)

Semi seriously though, I seem to remember some system that the military used for audio decades ago, that used a matrix of center tapped transformers to do something similar to that. I think they would send one signal down the "center" wire, then send a second signal through BOTH, sort of common mode, then another signal common mode through the ground and the second, etc. They could send dozens of different channels over a single wire with nothing but transformers. They didn't even need the outside braid, since they were using actual ground for that. I wish I could remember the actual circuit diagram but it is something similar to what I described, ie each additional signal went in a center tap, and the outside wires went to ground and the previous signal wire. It was something they taught in an ROTC class I took back in 1961, so my memory is a bit foggy. It was one of those things you see in movies, where some soldier would walk from one command post to another trailing wire from a spool, then they could connect multiple telephones to the switchboard on each end.
Probably wouldn't work for L-band, but you never know.