Re: [Openbts-discuss] My cell phone can receive 00101 base station network, but my phone unable to connect to the 00101 network.

[Tom T. <to...@ts...>]

On Tue, Feb 3, 2015 at 2:58 AM, osese <yc...@16...> wrote:
> My cell phone can receive 00101 base station network, but my phone unable to
> connect to the 00101 network?
>
> Start the OpenBTS has the following tips:
> OpenBTS> ALERT 12463:12480 2015-01-30T17:06:29.6
> Transceiver.cpp:414:pullRadioVector:Clipping detected on RACH input
> OpenBTS> ALERT 12463:12480 2015-01-30T17:06:30.9
> Transceiver.cpp:414:pullRadioVector:Clipping detected on RACH input
> OpenBTS> ALERT 12463:12480 2015-01-30T17:06:37.5
> Transceiver.cpp:414:pullRadioVector:Clipping detected on RACH input

The handset tries to access the base station - three times - but the
uplink signal is overpowering the receiver and the access bursts are
lost. As others have suggested, posting your setup details is helpful.
In general, though, the receive signal is just too strong.

When you see the clipping detection triggered, you can try one of the following.

1. Reduce the RF receive gain through the 'rxgain' command
2. Increase the distance between mobile and the BTS
3. Place an attenuator(s) inline with the receive antenna

  -TT