[Discuss-gnuradio] How many tunable parameters in GNU radios?

Hi All: I have a very general question, does anyone know how many tunable parameters (approximately) are there in GNU radio (e.g. USRP1)? Suppose two radios need to get/set each other's parameters, in the conventional approach, they need a fixed protocol, the number of tunable parameters will eff

[Discuss-gnuradio] message queue problem in bbn_80211b_tx.py

Hi, all, I am trying to communicate between two USRP1 with the bbn_80211b_tx.py and bbn_80211b_rx.py. My OS is Ubuntu 10.10, but I have no idea what is my GNU Radio release(if anyone can help me to find out it, it will be very appreciated.) First, I tried to transmit the getty.txt. I run the c

Re: [Discuss-gnuradio] HELP! Is it a defective USRP1?

1/09/2010 02:34 PM, Rachel Li wrote: > >> Hi All: >> >> I am experiencing something strange with USRP1 and already tried a lot of >> approaches to diagnose where the problem is, but no luck so far. >> >> We have two USRP1, each of which has a RXF 2400 daught

[Discuss-gnuradio] HELP! Is it a defective USRP1?

Hi All: I am experiencing something strange with USRP1 and already tried a lot of approaches to diagnose where the problem is, but no luck so far. We have two USRP1, each of which has a RXF 2400 daughter board and an antenna connected to the Tx/Rx port. When we run benchmark (benchmark_tx.py and

[Discuss-gnuradio] Question of tx_ampl range: [0, 1) or [0, 2^15/2) ?

Hi All: I am trying to set a proper pair of tx amplitude and rx gain, but found something confused. In transmit_path.py ( ..-> packet_transmitter -> Multiply Const -> USRP Sink), I see that the range of Multiply Const is [0, 1). However, in one of the GRC example usrp_tx_dpsk.grc (Random Source

[Discuss-gnuradio] missing module scipy.linalg

Hi All: I am trying to run the examples in gr-trellis/src/examples and learn how to use the trellis modules. However, there is an error up: ImportError: No module named scipy.linalg Also, I couldn't find this module on my computer too. Could anyone give me some help on this problem? Many thanks

[Discuss-gnuradio] GRC question: How to measure BER when Tx and Rx are on different machines?

Hi all: I have Tx and Rx on different machines. To measure the BER, I need to compare the a reference stream and the output stream of the demodulator. I suspect that my way to obtain the reference stream is wrong. Here is how I obtain the reference stream: 1: At the Tx, I used Random Source to

[Discuss-gnuradio] Re: GRC problem: window turns grey after executed

Problem solved. Thanks a lot, Markus!! Also, thanks for sharing this tutorial. I happened to find it yesterday too and found It extremely helpful! Rachel On Tue, Nov 2, 2010 at 1:05 PM, Rachel Li wrote: > Hi all: > > I am using GRC 3.3 on ubuntu 10.10. After I "generate"

[Discuss-gnuradio] GRC problem: window turns grey after executed

Hi all: I am using GRC 3.3 on ubuntu 10.10. After I "generate" and "execute" the flow diagram, the graphical sink window will show up (e.g. FFT skin or Scope sink). However, everything in this window will turn grey after a few seconds and I am not able to click any button in the window. When I tri

[Discuss-gnuradio] How can I add channel encoder/decoder and equalizer in usrp_transmit_path.py and usrp_receive_path.py?

Hi: I am new to gnuradio and have a question regarding how to build a communication link from scratch. This is the communication link I want to build: Tx link: Data bit stream -> Hamming Coding -> QAM modulation -> add training sequence -> (send to the air) Rx link: QAM demodulation -> Decisio