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BLE can't link up when receiver gain changed from standard gain to high gain

Raymond Chen
Intellectual 350 points
Other Parts Discussed in Thread: CC2541

Hi :

I am using CC2541 Keyfob and want to change the reciver gain to high-gain mode so I add one more line of code :: HCI_EXT_SetRxGainCmd( HCI_EXT_RX_GAIN_HIGH ) to the following extracted from keyfobdemo.c

 ===================================================

switch ( currentTxPowerLevel )

      {

      case 0:

        newTxPowerLevel = -6;

        // change power to -6 dBm

        HCI_EXT_SetTxPowerCmd( HCI_EXT_TX_POWER_MINUS_6_DBM );

        HCI_EXT_SetRxGainCmd( HCI_EXT_RX_GAIN_HIGH );  

        // Update Tx powerl level in Proximity Reporter (and send notification)

        // if enabled)

        ProxReporter_SetParameter( PP_TX_POWER_LEVEL, sizeof ( int8 ), &newTxPowerLevel );

        break;

=======================================================

There is no problem compliering the code and programming the code into CC2541.  However, when I used iphone to test, the BLE connection always fail to link up.  The screen of iphone always show "disconnected from peripheral".  When I remove the line of the code, then connection can successfully link up again.  Can you please advise why I see the problem and how to fix it ? 

Thank you very much

-Raymond