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IWR6843ISK: Do I really get 40dBm transmit power when I set it in 61.0-61.5GHz range?

Ziyou Xiong
Prodigy 240 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843

Hi:

I have a question regarding the REAL Tx power, or the Effective Radiated Power, that the IWR6843 transmits when it sweeps in the 61.0-61.5GHz band range. Please see my settings below. I know that the Tx conductor level power is +10dBm. In the following figure the "Rx Gain(dB)" has a default value of 30dB. The "RF Gain Target" also has a default value of 30dB. So I suppose that the total Tx transmit power is 40dBm (+10dBm + 30dB). Am I correct?

I'm targeting to get this 40dBm Tx power, allowed by the FCC. If my settings are not correct, could you let me know how I can get 40dBm Tx power?

Thanks.

Ziyou

  • 0
    TI__Mastermind 33805 points

    Hi Ziyou,

    Ziyou Xiong said:
    So I suppose that the total Tx transmit power is 40dBm (+10dBm + 30dB). Am I correct?

    No, this is not correct. The RX gain and TX power are two different parameters.

    The TX power + TX gain  = Output power from the antenna.

    For certification  you have a power meter, receiving antenna, and the device at a distance X from the antenna.  you calculate the mean power taking into account the loss due to the distance, the RX gain of the receiving antenna, any other losses involved and gain involved. I recommend contacting a FCC test house for more details on the test and test setup.

    Regards,

    Charles O

  • 0
    TI__Mastermind 25835 points
    Hello,

    RF gain target is mentioned in the GUI is only for the Receiver chain, which has amplifier on the path.
    For the transmitter maximum power available is 10dBm only. Only you could do back-off the power but cannot increase.
    If you want to increase the power then you may have to design custom antenna with higher gain to reach 40dBm number.

    Thanks and regards,
    CHETHAN KUMAR Y.B.
  • 0 in reply to Charles Oladimeji
    Prodigy 240 points
    Charles O:

    Thanks for your answer.

    What is the current TX gain? I have not been able to find this information in the IWR6483 spec. I do know that "TX Power: 10 dBm".

    Ziyou
  • 0 in reply to Ziyou Xiong
    TI__Mastermind 25835 points
    Hello,

    On the Tx chain maximum power that you could achieve is 10 dBm.
    There are no additional gain stages are available. You could do only Power back-off up to -20dBm.

    Thanks and regards,
    CHETHAN KUMAR Y.B.