Charles Swiger wrote: > Hi Gang - Did somebody have the DRM decoder working with a gnuradio > receiver? The main issue is feeding the sound from gnuradio into DReaM, > somehow, other than using two soundcards. I have DReaM 1.6.25 compiled. > > http://sourceforge.net/projects/drm/ > > TIA > > --Chuck
Hello, I am setting up the DReaM decoder using the USRP. I am gradually getting it to work and managed to copy Radio New Zealand this morning on 9690. I was using the "No-Mod" DRM Mod for the AOR 5000 but found I needed a very good signal to get anything. I am using the 10.7 MHz IF out of my AOR 5000 reciever connected to the USRP with Basic RX via a torroid transformer. The transformer was originally used to cut down noise but I had to make it a step-up transformer to increase the signal level. The secondary is connected to RX A and RX B as a differential input. I used similar code to what was posted on the list in 2005 to convert the 10.7 MHz to baseband. I resample the baseband from 64000 samples per second to 48000 samples per second and output it to a Griffin iMic USB Audio dongle. I am outputing "stereo" (I/Q). I am going to try using Jack to loopback the audio but currently I am looping the iMic output to the iMic input. DReaM is setup to use I/Q by using the -c 4 parameter. I use -c 4 because the IF Output spectrum is inverted. DReaM outputs to my main speakers on the laptop. The laptop I use does not have line in so I use the iMic for other decoding and get two outputs in the process. The iMic is not very expensive but using jack is even cheaper. 73 Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
