Are the ports on the Channel Master Ultra Mini 8 (CM3418) power passing? I want to use an IR over Coax adapter to control my satellite receiver in a different room. It requires that I pass DC through the coax.

No. The ports on the Channel Master Ultra Mini 8 (CM3418) are not power passing.  However, an option would be to use a Ultra Mini 1 (CM3410) one port distribution amplifier, and a short cable to a power passing 8-way splitter.  This would have the same gain as using a Ultra Mini 8 (CM3418) since it has an internal 8-way splitter after the amplifier.

Please see the diagrams link attached below to help you understand how to connect a preamp/distribution amp in your antenna system.    

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