After some test with SSB reception I found what frequency output tends to drift around 3-5 Hz, it sems to be not syntezer.. I tryed TCXO - same results. If I touch chip with something magnetic I can listen big frequency shift (but it return back after some seconds). Is it possible to use external heterodyne with this chip (not TCXO to RCLK - it will not help)

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  • Hi,

    It doesn't have the PLL inside. It only has the AFC locked to crystal (RCLK), like the FLL.

    Mixing down the RF signal externally is also not workable for Si4735

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