Doug,

Don't know what is considered "acceptable for the 590, but  the TCXO for 
higher frequency stability is  optional (was standard on the TS-2000). 
  There was a long recent thread on the TS-590 list about the 
risks/rewards of buying the knockoff TCXO board from China as opposed to 
the expensive  unit from Kenwood.    I *think* the Kenwood part has to 
be soldered in, while the Chinese knockoff is a plug-in replacement board.

I think someone from this list went the Chinese route, but I'm not 100 
percent sure, so I won't out him here.

73, Steve KW3A

On 1/16/2016 3:06 PM, Doug Payne wrote:
> Hello,
>
>
>
> I've noticed my TS 590S is slightly off frequency, that is, the display
> frequency does not match the receive frequency. The discrepancy worsens as
> the frequency increases. From what I can tell from zero-beating WWV on SSB,
> and listening to other sideband signals on 50.125 mHz, it seems to be low by
> about 40 hz on 15 mHz, and by about 120 hz on 50.125 mHZ. Has anyone else
> experienced this with their Kenwoods? If so, how did you address this?
>
>
>
> Thanks,
>
> Doug,
>
> AC7T
>