Do you think you need to use an LC oscillator for the LO? I used an
LTC6907CS6 as an FM oscillator at 1.8MHz, 2.3MHz, and 2.8MHz in the IR
transmitter I talked about earlier.

Another trick is to use binary weighted capacitors and analog switches to
to tuning. I recall a chip that has binary weighted capacitors on the chip
and an SPI interface.

The antenna tuner I use on amateur radio has binary weighted inductors and
binary weighted capacitors and then relays that switch them in and out to
adjust the tuning as required.

Harold





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