Re: [Discuss-gnuradio] Using the dqpsk modulator

2009-04-15 Thread Karim El Defrawy
Thanks a lot for the feedback. I got it to work eventually. Eric Blossom wrote: On Tue, Apr 14, 2009 at 04:03:13AM -0700, karim wrote: Eric Blossom wrote: On Thu, Apr 09, 2009 at 09:46:43AM -0700, karim wrote: Hi, I am trying to use the dqpsk modulator block to modulate some data and then

Re: [Discuss-gnuradio] QPSK basic modulator

2009-04-08 Thread Karim El Defrawy
Thanks a lot Eric. That's very useful. Yes, you are right about the preamble. At this stage I am just doing the transmitter, later I will worry about how to correctly receive it and will probably add a preamble. Ed Criscuolo wrote: karim wrote: Hi, I need to implement a simple transmitter

Re: [Discuss-gnuradio] QPSK basic modulator

2009-04-08 Thread Karim El Defrawy
Jason Uher wrote: I checked the benchmark_tx.py it adds a preamble and a lot of data before the actual payload which I don't need. I assume you are trying to do some BER measurements? There is an example called digital-bert that will do that (bert=bit error rate tester). Actually I am not

Re: [Discuss-gnuradio] Minimum value for center frequency step size

2009-03-11 Thread Karim El Defrawy
;s good to know. Eric Blossom wrote: On Tue, Mar 10, 2009 at 05:33:36AM +0100, Karim El Defrawy wrote: Hi, I am using a FLEX2400 transceiver daughterboard and was wondering what's the minimum step size that I can use to set the center frequency. I tried steps down to 500KHz a

[Discuss-gnuradio] Minimum value for center frequency step size

2009-03-10 Thread Karim El Defrawy
Hi, I am using a FLEX2400 transceiver daughterboard and was wondering what's the minimum step size that I can use to set the center frequency. I tried steps down to 500KHz and I could tell the difference between the generated carrier frequency of a sine wave on an oscilloscope. When I tried