That's not a guarantee , I have the kit but so far haven't used it because I have complete quiet both on the local machine and simplex , but as I wrote in my above post this is my nightstand radio , so I can be lazy and not get in my wheelchair to go sit at my bases , so it's very easy access and would be all of about ten second to swap ,if he is gonna rip his car apart to mount it hidden away with just the head and mic showing then absolutely use the Kenwood cable , work smarter so you don't work harder!Always best to Read the radio first, save that to a safe place. Then you will have a back up "code plug''.
I always Read the radio first, then make changes. Then put that back into the radio.
No the 'coupler' and Cat cable do not work due to the way Kenwood uses the pairs. You will get ticking in the transmit audio from the data line crossing over into the mic line. A known problem.
Cat 6 will NOT help the known ticking problem.So you are saying it's better to bite the bullet and buy the Kenwood extension cable set for $65 vs a good Cat-6 for about $10?