So I am new to ham but have had a lot of experience with CB radio. What I am wanting to do is add a dual band to my motorcycle but still retain the factory cb in dash and pipe it all through the intercom headsets. I will be adding a 2nd ptt switch to the left handlebar to trigger the dual band. To do this I think I need a mixer to match the 2 signals together. I would also like to add a 3rd input to the intercom so that the sidecar can have one as well but that might be better suited as a wireless add on. Has anyone ever built a mixer to send 2 signals through a single headset and split the mic output between them?

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