This is a brief tutorial covering the wire connections necessary to use these devices together. It is important to note that whether you are using paddles or a straight key, the MFJ-464 will output the signal as if it is coming from a straight key. For this reason you will need to configure the IC-7300 to expect a key. These steps are nicely outlined in this document from DXEngineering: https://static.dxengineering.com/global/images/technicalarticles/ico-ic-7300_jy.pdf
Also, the RCA to 1/4″ connector seems to be difficult to source. I made mine and it is a mono connection. Since I cannot post a photo, I have created a tiny companion video to illustrate this at https://youtu.be/UhhVediXkJg. Best of luck!

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