[sat_uplinker]

Quick question about the LNB connection for DirecTV. I currently have the elliptical offset dish with 101W and 119W LNB’s installed. The bracket has a spot for 110W (aka SAT C). I will be installing that third LNB in order to get ESPN and the like with D*’s new HD package. I only have 1 reciever. My current setup includes a 4x4 switch, and each of the 2 LNB’s has two coax feeds coming out of it, for a total of 4 runs to the multiswitch. My question is this: Why do the LNB’s need two wires? Isn’t that switch like a router? I thought the two-output LNB is for a two receiver, single LNB system? I don’t have room to pull two more wires for the third LNB; I would like to change it so each LNB only has one wire going to the switch. Will that work?


thanks.

bob

 

[leesweet]

Each LNB has possible outputs of Left and Right polarization. The 2x2 outputs are to allow any of the bottom (receiver outputs) to get any of the possible LNB outputs. You don't need more inputs to the MS for the sat-C LNB. It comes with a combiner to stack the sat-LNB output onto one of the others single outputs still yielding 4 total outputs. Take a close look at a sat-C kit and see: http://www.solidsignal.com/prod_disp...oom=zoom#xview

 

[sat_uplinker]

I didn't think of it like that. I'm used to a LNB for each polarity. In a sat truck, the dish has two LNB's- one for vertical and one for horizontal. I know DSS uses circular polarization. I didn't know one LNB could output both RHCP and LHCP.

 

[AntAltMike]

Quote:

Originally posted by sat_uplinker I'm used to a LNB for each polarity. In a sat truck, the dish has two LNB's- one for vertical and one for horizontal. I know DSS uses circular polarization. I didn't know one LNB could output both RHCP and LHCP.

Actually, one "DUAL" LNB can output each polarity. The dual LNB contains two separate Low Noise Blockdownconverters.


There are also dual linear LNBs that can be fitted to an antenna like the one used on your downlink truck. That is what Primestar used. With the Primestar LNBs, one port was dedicated to horizontal and the other vertical. With the DBS LNBs, each port can be internally matrixed to either polarity.