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
Kenwood TS-590SG
Transmit | TS-590SG | Amateur Radio | Communications | KENWOOD USA
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I upgraded my Kenwood TS-590SG with TCXO and Military Look - YouTube
Kenwood TS-590SG – Jahnke Electronics
Kenwood Ts-590sg Base Shortwave Station Fixed Station Amateur Radio Ham Radio Emergency Communication Dhl Free Shipping - Instrument Parts & Accessories - AliExpress