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...mixing RG6 and RG59 in the same system. Cannot help but wonder if there could be an impedence mismatch?
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Both are 75 ohm impedance. No mismatch there.
Of greater concern is that the RG59 typically has a thinner diameter center conductor. If you connect it to a female F-connector that has previously had RG6 connected to it, you may find that the connector does not make a secure physical and electrical connection. Such a loose connection behaves like a capacitor and can cause a loss of lower frequency (think VHF frequencies) pass-through.