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Tal.Ram
Tal.Ram
Associate
April 26, 2016
Solved

Off-board antenna design

  • April 26, 2016
  • 1 reply
  • 634 views
Posted on April 26, 2016 at 17:05

Hi, for our application we must use an off-board antenna, which will be a PCB antenna and will be connected via coaxial cables to CR95HF IC.

As I see it, the matching components should be located on the antenna side (on PCB) and on the CR95HF and host MCU should be just the connectors straight to the Rx1, Rx2, Tx1, Tx2 lines. Am I correct? does it sounds right to connect both PCB's by those 50 ohms coax cables?

And a not related questions-

1. why there are two Rx inputs and two Tx outputs in the IC?

2. which i/f is used in the CR95HF Demo board, SPI or UART?

Thanks!

Ram

#cr95hf
    This topic has been closed for replies.
    Best answer by Peter Boringer
    Posted on July 06, 2016 at 18:07

    Yes this might be operational, but not optimized. Take care of the effect of the coax  with the output impedance of the CR95HF. Take care also that RX and TX be  differential, this is the reason why there are two RX inputs pins  and same for TX.

    By default you should have SPI link on CR95HF.

    1 reply

    Peter Boringer
    Peter BoringerBest answer
    Visitor II
    July 6, 2016
    Posted on July 06, 2016 at 18:07

    Yes this might be operational, but not optimized. Take care of the effect of the coax  with the output impedance of the CR95HF. Take care also that RX and TX be  differential, this is the reason why there are two RX inputs pins  and same for TX.

    By default you should have SPI link on CR95HF.

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