There should be a fairly precise specification available regarding the range over which pulse widths and rep-rates occur, since the inductor characteristics will limit those parameters. That will help you in choosing a clock rate.

If the signal rate is well-defined, then you should have no trouble figuring out how to use the Mode-0 serial port to send your data with an MCU that can provide the appropriate instruction execution cycle per bit ratio. I'd suggest you take a really close look at the DS89C4x0 types, since they offer a lot of flexibility in that regard. They're also available in standard packaging so you can drop them in place of some other standard-packaged part. You might have to insert an external flipflop in series with the data, in case there's a foreshortening risk because of code synchronization with the transmission process.

RE