[Discuss-gnuradio] USRP data rates

2007-08-08 Thread Lisa Creer
The USRP sales brochure lists as a feature "Capable of processing signals up to 16 MHz wide". I can only figure out how it can process signals up to 8 MHz wide. What am I missing? Since samples sent across the USB are 16-bit signed integers (16-bit I and 16-bit Q for complex samples) that makes ea

Re: [Discuss-gnuradio] USRP data rates

2007-08-09 Thread Lisa Creer
On 8/9/07, Johnathan Corgan <[EMAIL PROTECTED]> wrote: > It is possible to retain only the upper eight bits of each sample and > pack these into two bytes such that the USB can carry 16 Msps complex; > this gives you more passband bandwidth at the expense of dynamic range. Now that I know it can

[Discuss-gnuradio] Problem with 8-bit option and dropped samples

2007-08-20 Thread Lisa Creer
I'm testing the -8 option in various example programs, and haven't been successful in receiving valid data. The following test resulted in a very brief, flat line being displayed, then absolutely no data showed on the graph, but the program continued to run. ./usrp_fft.py -f 100M -d 4 -8 format

Re: [Discuss-gnuradio] Problem with 8-bit option and dropped samples

2007-08-21 Thread Lisa Creer
On 8/20/07, Eric Blossom <[EMAIL PROTECTED]> wrote: > > On Mon, Aug 20, 2007 at 11:15:36PM -0400, Lisa Creer wrote: > > I'm testing the -8 option in various example programs, and haven't been > > successful in receiving valid data. The following test resulte

[Discuss-gnuradio] Fun with filterbanks

2008-01-09 Thread Lisa Creer
I've recently tried out the synthesis_filterbank method provided in filterbank.py and received unexpected results. I'm trying to use the filterbank to create one signal from multiple baseband signals. When I use two signals to create one output, I can see both signals using the FFT sink. I can extr