The way nomad mentioned is how I was doing it on the 29. For the 148/2000 chassis put the positive leg of the cap on the wiper of vr5 and the neg lead to board ground.
No need for a resistor. The cap will bleed off within a second or two in rx mode and once charged in tx it will have no effect
on the rest of the circuit.
I've heard about someone modifying the software for a Flex radio to do this. I haven't figured that one out yet.
Anyone installed this on a Uniden Washington?