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Does anybody know why they are different and which is the main signal carrier coming from a dual LNB. I had to replace my multiswitch and forgot to label each cable (long run from dish to multiswitch).

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The different voltages select different polarizations of the satellite signal. This allows each LNB of a dual LNB to receive a different set of channels. If you have the standard round dish with one dual LNB, it does not matter which LNB gets which voltage, as long as each gets a different voltage.


If your multiswitch has 22khz inputs, connect them to a second LNB. which is for sat B on an elliptical dish.
 
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