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Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on USRP2

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on USRP2
Date: Thu, 28 Jan 2010 22:40:33 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100120 Shredder/3.0.2pre

It could be failing to lock. You may want to watch the debug port on the usrp2. If the lock detect is failing, it will print out on the serial console. attach a 3.3v level serial port

On 01/28/2010 10:09 PM, Ian Holland wrote:
Hi Josh

The xcvr has a high band and a low band, which means there is a gap in
the tunable frequency range for the xcvr. Therefore, the
"auto-calculated mid-point frequency" is an invalid frequency for the
xcvr. Pick a frequency in the high band or low band range:


Thanks - I will keep that in mind when using usrp_siggen.py in future.

However, I have tried 2.4G with the source code from my original post
(relevant code snippet for Tx tuning just below this paragraph, for
which successTx is 0 and all frequency properties in TxTuneResult are
0), and also with usrp2_fft.py -f 2.4G, after burning the latest images.
I still face the same problem that neither the Tx nor the Rx will tune.

/* try tuning Tx to a test frequency */
double Fc = 2400000000.0;
usrp2::tune_result TxTuneResult;
bool successTx = device->set_tx_center_freq(Fc,&TxTuneResult);

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