Kenwood TS-590S for Digital Data or Digital Voice - Resource Detail - The DXZone.com
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TS-590S | Amateur Radio | Communications | KENWOOD USA
Kenwood TS-590S New Firmware released ‹ SPARKY's Blog
The cheap Chinese copies of the Kenwood TCXO boards are rubbish, I bought and installed a superb TCXO from Mark Goldberg, W7MLG. The results are fantastic, my TS-590SG is now spot on