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CC1101 Frequency Shift using Johanson Balun

Other Parts Discussed in Thread: CC1101, MSP430F2350

Hi Community,

I have a projekt where I use an MSP430F2350 together with an CC1101 Transceiver.

I am using the reference design. In order to save some components I used the Johanson Balun Filter for CC11xx chips for 868 MHz.

I programmed the CC1101 according to the register values of SmartRF Studio for 868 MHz.

Now when I only turn on the carrier (STX Strobe) and connect my board to an spectrum analyzer I see the carrier frequency at 830 MHz.

Its the same case on both of my boards that I built.

Does anybody have ideas where to look for the mistake?