Tips #11 and 12 - fill those unsightly "Aux Connector" rear-panel holes

Kenwood provided a couple of empty holes on the 530 and 830 rear panel - per their manual, for Auxiliary I/O connectors. One documented use is for a phone patch input (also usable for AFSK). Another is for a phone patch output or demodulator connection...still others are for IF outputs to a band or signal scope. Since we added the scope I/O to the '530 via a TS-830S I/O sub-panel, we can now use the holes for custom I/O applications. (Connector additions to a TS-830 will be covered later in the thread.)

Covered here will be a Phone Patch input and a Sidetone output; the latter is useful when running the transceiver with a secondary receiver.