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AWR1843BOOST: Transmit power of AWR1843Boost

Venkatesh Manikundalam
Prodigy 190 points
Part Number: AWR1843BOOST

Hi,

I'm interested in knowing if we can increase the transmit power of the antenna in AWR1843BOOST? Currently the output is pegged at 12dBm with a gain of 9dB. I want to increase the transmit power to 24dBm and gain of 9dBm (which is well under the FCC limit of 55dBm requirement). FCC re-certification is not a problem. I'm more interested in knowing if there are any other side effects (like saturation of the receive path, ability of the on board antenna to with stand this power etc). 

A quick response is highly appreciated.

Thanks

Venkatesh

PS: I have seen some posts regarding the transmit power measurement and backoff but not exactly related to increasing the transmit power. Therefore a new post.

  • 0
    TI__Guru 69960 points

    Hi Venkatesh,

    The sensor supports a max of 12dBm transmit power (from single Tx) only.

    There is two way to get higher than this power-

    1. Use all three Tx at a time to create a beam, where at boresight you would get max Tx power. But even with this option, you can't reach to 24dBm.

    Refer http://dev.ti.com/tirex/explore/node?node=AJz0Sish0qIA72e7InIbEw__AocYeEd__LATEST

    2. Use a high gain antenna to get the required transmit power. This is a preferable option to get your number.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Prodigy 190 points

    Hi Jitendra,

    Thanks for a quick response. 

    Can you please suggest how to go about using a high gain external (?) antenna? Could you suggest a suitable part number and any hardware mods?

    I'll also in the meanwhile try out option 1. There are two problems with that - 

    1. Range is limited to 150m. 

    2. Velocity output is not coming.

    Can you please suggest how to go about that as well?

    Thanks

    Venkatesh

  • 0 in reply to Venkatesh Manikundalam
    TI__Guru 58035 points

    Hello Venkatesh,

    To increase the antenna gain you need to design your own antenna on the PCB with a higher gain. The antenna gain on the EVM is about 9-10dBi.

    The range will also depend on other aspects such as RCS of the object, the detection threshold and algorithm used etc.

    Regards,

    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 190 points

    Hi Vivek,

    I shall rephrase the question for a better answer - 

    Would TI recommend any COTS antenna so that I can control the transmit power externally? Given other parameters being held constant, range should be directly proportional to the transmit power right?

    I hope TI would have tested with different antennae and if so could you please share the performance results?

    Also, any inputs on how to get velocity measurement out will be appreciated.

    Thanks

    Venkatesh

  • 0 in reply to Venkatesh Manikundalam
    TI__Guru 58035 points

    Hello Venkatesh,

    You are right that higher the antenna gain larger the range at bore sight. But higher gain antennas typically also have a smaller field of view.

    For 80Ghz off the shelf antennas are not easily available, most users design their own antenna . We have designed our own PCB antenna's which you can find on the EVM. The antenna gain results of the EVM are available in the EVM userguide. If you need a different antenna characteristics you would have to modify the design.

    Regards,
    Vivek