Re: [Openbts-discuss] OpenBTS error "TX failed to tune" with 52M clock

[Howard W. <how...@gm...>]

Thanks for your reply.
I am using the same config with another 64M USRP. The handsets can register
it.

The Kal 0.4 runs with the 52M clock.

I follow the
Reclocking the USRP-1 for
OpenBTS<http://gnuradio.org/redmine/wiki/gnuradio/OpenBTS>
* No changes to gnuradio are necessary if do not need default gnuradio
applications and examples (like usrp_fft.py). If you need them, then you
should apply the following patch:


I trace the coding in Transceiver52M, till USRPDevice.cpp


#ifndef SWLOOPBACK
bool USRPDevice::setTxFreq(double wFreq) {
...
   bool retVal = m_uTx->set_tx_freq(0,(wFreq-actFreq));
   LOG(ALARM) << "52M set TX: " << wFreq-actFreq << " actual TX: " <<
m_uTx->tx_freq(0);

}

the retVal is false,
1302599970.4680 ALARM 3078830960 USRPDevice.cpp:636:setTxFreq: 52M set TX:
-36375000.0000 actual TX: 0.0000


While the value of an original USRP is:
true

1302600410.3125 ALARM 3074415472 USRPDevice.cpp:533:setTxFreq: 64M set TX:
-5000000.0000 actual TX: -5000000.0000


Any idea?
Thanks!




On Tue, Apr 12, 2011 at 4:25 PM, Axelle <aaf...@gm...> wrote:

> Hi,
>
>
> > It's a 52M TXCO the same kind with the one in OpenBTS for dummy's
> > introduction.
> > I then updated the OpenBTS.config to use Transceiver52M and get the
> follow
> > error:
> > 1302589150.3524 ALARM 3077639024 Transceiver.cpp:551:driveControl: TX
> failed
> > to tune
> > 1302589150.3526 ALARM 3074148576 TRXManager.cpp:371:tune: TXTUNE failed
> with
> > status 1
> > Would anyone please kindly to advice? Thanks!
>
> Did you patch GnuRadio too ?
> Have you tested your USRP like in 6.1. and 6.2 of the For dummies ?
> Does it show a peek for ~1800Mhz (figure 7) ?
>
> Good luck,
> Axelle
>
>
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