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WL1837MOD: Using RF_ANT2 as a separate antenna

Shai Berman
Mastermind 7400 points
Part Number: WL1837MOD

Hi Team,

My customer is working with wl1837mod chip and he tries to configure it to MIMO mode in order to work ANT1 and ANT2 separately.

But when he checked the "RF_ANT1" it was working, but if when he uses/connect to RF_ANT2 antenna there is no signal.

can you please advise if our WL1837MOD devices support of using two separate antennas (on 2.4Ghz)?

and if it does support that, can you please check the following customer configure (he works with NXP iMX6)

 cd /usr/bin/wlconf/configure-device.sh

Y

1837

N

2

0

Thanks in advance,

Best regards,

Shai 

  • 0
    TI__Mastermind 20285 points
    Hi Shai,

    Yes he can use two antennas on 2.4Ghz
    Are they only connecting two 2.4GHz antennas and zero 5Ghz ones?

    Can you ask them to send the dump file of their wl18xx-conf.bin?

    Best Regards,
    Eyal
  • 0 in reply to Eyal Reizer
    Mastermind 7400 points
    Eyal,

    Yes, they connect only 2.4Ghz antennas but there is a scenario that RF_ANT1 is not connected and RF_ANT2 is connected and in this use case the RF2 do not TX any signal?
    can you please advise if RF1 is required even if the customer wants to work with RF2 antenna only?
    Thanks in advance and regards,
    Shai
  • 0 in reply to Shai Berman
    TI__Mastermind 20285 points
    Why is there such as scenario?
    The antenna diversity algorithm is automatic, internal to the firmware.
    If you specified that there are two assembled antennas, then that's what they should connect.

    BR,
    Eyal
  • 0 in reply to Eyal Reizer
    Mastermind 7400 points
    Hi Eyal,
    after escalating with the customer regards the scenario, I found that this for marketing purpose.
    the customer claims that MIMO devices should operate with RF1 and RF2 standalone (meaning the antennas is not dependent on each other).
    the customer tried to work with ANT_RF2 (ANT_RF1 not connected) and he didn't get signal but after connecting the ANT_RF1 the devices started to work.
    can you please confirm that if our devices can be operated on ANT_RF2 even ANT_RF1 is not connected?
    Thanks,
    Shai
  • 0 in reply to Shai Berman
    TI__Mastermind 20285 points
    Shai,

    The customer’s assumption is not true.
    The 2nd antenna is used only for MIMO traffic.
    There is no antenna diversity on 2.4GHz only on 5GHz band – meaning that only ANT1 is used for SISO traffic and especially for beacons reception – it is not replaceable.
    So, blocking ANT1 will definitely result in connection loss…

    BR,
    Eyal
  • 0 in reply to Eyal Reizer
    Mastermind 7400 points
    Eyal,

    Understood, Thank you very much for the detailed answer.

    Best,
    Shai