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
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Kenwood TS-590SG
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Kenwood TS-590SG
Kenwood TS-590SG 100W HF/6M Ham transceiver & one buck | Reverb Finland
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TS-590SG | Amateur Radio | Communications | KENWOOD USA