Kenwood AT-250

This is a collection of notes on the care and feeding of the AT-250 auto tuner.


Well, it’s an auto-tuner. It’s designed for plug and play operation with a TS-430S and TS-140S - the DIN connectors on those expose the right remote band control pins to drive the AT-250. The TS-680S also does but it obviously doesn’t work for tuning on 6m.

I use it on a TS-440S by shorting the “engage ATU/transmit” pin.

Common Issues

.. mostly? The relays need replacing.


This is a collection of versions of user manauls and service manuals.