Rewire the 530 Antenna relay
In the TS-530 series, the Antenna Relay's Receive (NC) contact is routed straight to the front-panel Attenuator control through a length of Miniax cable. The '830 intercepts this line at the X.VTER connector and provides a means to switch the RX input to an external signal source.
Shown is a portion of the '830 schematic. An additional run of Miniax (sourced from a discarded wiring harness, or from an electronic supply house) is added to the '530's Antenna relay after the existing connection at its NC (RX) terminal is de-soldered:
RL1-Rewire.jpg
Modifications to the socket connections of RL1 in the PA Compartment are shown. Once it's de-soldered, pull the line from the RF ATT connection out of the PA Compartment wiring and route it to the area between the EXT VFO and REMOTE connectors...where the new Xverter connector will be installed. Measure a length of Miniax to run between RL1 and the spot for the X.VTER connector - allowing an inch or two excess - then dress and prep the ends (braid and shield) per Kenwood practice. Connect center and shield to the points indicated on RL1's socket, then - following the original cable routing path - pull the Miniax through the chassis cutouts, along the rear wiring harness and to the X.VTER connector spot. Make sure none of the cables can come into contact with the final tubes or any moving parts (such as the band switch).
PA-RL1-Details.jpg
The surplus harnesses I obtained had a couple of runs of exactly the right length.