You can probably get the truth chart from a Maxon LMR or Selectone LMR service manual - The MXCOM chip was not uncommon for them - will take a peek in the morning. Steve NU5D
Terry wrote:
> Can anyone ID this tone encoder board?
>
> IC is mx-com mx315
>
> marked with FT303
>
> 6 dip switches
>
> DCS / PL ?
>
> Truth Chart ?
>
> THX, WX3M
>
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