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Re: [Discuss-gnuradio] DReaM and gnuradio
From: |
Eric A. Cottrell |
Subject: |
Re: [Discuss-gnuradio] DReaM and gnuradio |
Date: |
Sat, 30 Dec 2006 02:35:04 -0500 |
User-agent: |
Thunderbird 1.5.0.8 (X11/20060911) |
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