[Discuss-gnuradio] Howto tune RF frequency in blocks?

Hi,   I wonder if it is possible to tune the RF frequency in blocks written in c++.   In python, statements as the follow are used to tune the frequency of RF board. r = u.tune(0, subdev, freq)   I want to adjust the receiver's RF according that of the transmitter  automatically with some frequency

Re: [Discuss-gnuradio] Question about carrier syncronization fordemodulating QPSK/BPSK signal.

Thanks for your working.   I wonder if 1.28Msymbol/s (2.56Mbps for qpsk) is possible to be archieved through costas loop. I'm worry about the 32Mbyte/s of USB 2.0 interface may not be enough. I've read the code from http://aphex.media.mit.edu/wiki/tiki-index.php?page=BPSK  (using costas loop) and f

[Discuss-gnuradio] Question about carrier syncronization for demodulating QPSK/BPSK signal.

Hi, all   The problem is HOWTO do carrier syncronization. I am using two USRP with FLEX 2400, one for Tx, the other for Rx. The RF of both Tx and Rx are tuned to 2.45GHz. I generate and transmit a QPSK signal. At the receiver, an obvious frequency deviation can be observed from the fft sink. And o

[Discuss-gnuradio] Questions about using sound card for data tranfer.

Hi, bodys:) I'm trying to use the sound card to transferring bits and I find it may not be as easy as using USRP. My efforts are based on the fsk_tx.py and fsk_rx.py. The audio.sink & audio.source only I/O float type data, and not like USRP, we cannot set decimation ratio or interpolation ratio fo

Re: [Discuss-gnuradio] Problem with making sound card as source

re.Run alsamixer and make sure to turn on capture on your line input (withspacebar) and turn up the volume all the way, then turn on capture oncapture and turn the volume up all the way again. You should then be getting audio and adjust the volume down to reduce clipping.2 1 wrote:> Hi, Matt :)>

Re: [Discuss-gnuradio] Problem with making sound card as source

ns?  Have you set the audiomixer properly?Matt On Tue, 2006-05-09 at 20:34 +0800, 2 1 wrote:> Hi, all>> My USRP is on delievering, so I try to do someting with the sound> card.>> Unfortunately, the integrated AC97 sound card of my pc seem to not > work properly as source.> I

[Discuss-gnuradio] Problem with making sound card as source

Hi, all   My USRP is on delievering, so I try to do someting with the sound card.   Unfortunately, the integrated AC97 sound card of my pc seem to not work properly as source. I connect a mp3 player with the line-in port of sound card with an audio wire. In a script, the sound card is set to sourc