AXM0F343-64 - simple crystal

we need to make a low cost 433, 868,915 Mhz - for distance up 85 meter indoor point to point between walls - transmitter and receiver units
in the reference designed we saw only tcxo crystal .

  1. is the chip cable to work good with simple crystal 10mhz- 50mhz for indoor 2.5ppm - 10 ppm ? or even 1 ppm ?

  2. is TCXO is mandatory ( i see other known vendors do not use tcxo at all !!! ) ?



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