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Does it matter if the power through is a single port DC pass or both ports?
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Not if you use the one I told you to.
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Is my signal strong enough that it doesn't matter how I split?
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That's correct. With 22-24 dB of UHF gain from the pre-amp, you're "spending" about 3.5-4 dB for the first 2-port splitter, then another 7.5-8 dB for the 4-port. Add in the total length of RG6 from the mast-mounted preamp to the furthest outlet (cable length), divide that length by 17 to find the worst-case cable insertion loss. Using 100' RG6 coax as an example, your total worst case loss is under 18 dB which is less than your pre-amp's gain of ~24 dB @ channel 31.
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Any idea about what kind of insertion loss goes with using this splitter?
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I've tested samples in-house. My estimates above are using that data.