Adding a TS-590 as a sub receiver with the TS-890

UPDATE : PLEASE UPDATE THE FIRMWARE IN YOUR 590 SG BEFORE DOING THIS NEW FEATURES ADDED!!!!! ......
RELEASE NOTES: Updated item : (Version 1.04 1.05) [January 30, 2019]
The following feature is updated.
1. Adds "Split Transfer A" function as well as the TS-890S. The TS-590SG works as either "TX/RX End" or "Sub-receiver".
For details, please refer to the revised TS-590SG Instruction Manuals.
OK lots of emails on this so here is a shot how to video to connect a ts-590 (or other compatible Kenwood radios see 890 manual for a list) to a Kenwood TS-890. This allows you to have a sub reciever and you keep your 590....