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Is it available narrow band by using CC1101?

Kyung Seok Yoon
Prodigy 100 points
Other Parts Discussed in Thread: CC1101, CC1020

Dear all

In Korea regulation, The channel is divided into 12.5Khz, and occufied bandwidth sould not exceed 8kHz in 400Mhz arange.

We must use CC1101 in our application.

(data rate : 1.2kbps or 2.4kbps, carrier freq : 424.7Mhz)

I knew that this device using wideband, not narrow band.

Can I use CC1101, in Korea? If can be used, how can I set the register?

Please, help me...

Thanks...

  • 0
    TI__Mastermind 33160 points

    Hi,

    The CC1101 is not available as narrow band. The CC1020 can go down to 9.6 kHz so 8 kHz sounds difficult here. Exactly which specification does it specify that 8 kHz as a max with 400 kHz band? Can look into this in more detail if we can get the exact spec requirement.

    Regards, Richard.

  • 0 in reply to RGW
    Intellectual 805 points

    The minimum channel bandwidth of the CC1101 is 25KHz per the SmartRF settings, so in order to get 8Khz channels, you will have to change the FREQ0, FREQ1 and FREQ2 parameters instead of the channel number.

    Using FSK modulation and 1.2Kbaud data rate, you can set the deviation to 5.2KHz (the difference between the 2 frequencies of the FSK modulation) and make sure that your output power is not too high, so your noise does not spread too much beyond your 8KHz channel.

    Your crystal stability also plays a very large role in such settings, so make sure that frequency is also very accurate.

    On the RX side, you do not have much choice, with minimum RX filter bandwidth of 58KHz, your receiver will intercept adjacent channels and thus increase your error rate.

     

     

  • 0
    TI__Intellectual 1000 points

    Sorry Kyung, I assume that you need to design according to the ARIB RF standard at these frequencies and this is a very strict standard that CC1101 was not designed to comply with. The most narrow bandwidth that you can select on CC1101 is 58kHz. In Arib, you need 25kHz performance and also quite good selectivity.

    For ARIB, you can use CC1020 from Texas Instruments.