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Re: [Discuss-gnuradio] "check topology failed"
From: |
ChoJin |
Subject: |
Re: [Discuss-gnuradio] "check topology failed" |
Date: |
Sun, 10 Feb 2008 23:16:14 +0100 |
On Sun, 10 Feb 2008 15:32:03 -0500, address@hidden wrote:
> Thank you for your help Johnathan. Looks like I figured out the issue
> with Alsa and opened the channels using alsamixer. I was choosing the
> wrong hardware and now I am using hw:00,04 which seems to work with
> sampling rate 44.1K.
>
> command line: sudo ./tx_voice.py -f 991e5 -v -I hw:00,04 -M 1
>
> I now get this on the terminal:
>
> gr_fir_fff: using SSE
> bits per symbol = 1
> Gaussian filter bt = 0.35
> Using TX d'board A: Basic Tx
> Tx amplitude 12000
> modulation: gmsk_mod
Looks like you're using a gmsk modulation
[...]
> What I am trying to do now is to transmit whatever I play on the
> computer (songs) and receive it on a regular FM radio in the room. I
> see a pulse at the 99.1M frequency using the usrp_fft.py how ever I
> cannot hear anything on the radio. Could you please give me some
> guidance on that.
If you want to receive the audio on the FM radio, you probably should
transmit in wfm, not using an gmsk modulation (which is a digital
transmission). The blks2/wfm_tx block should do.
--
Best Regards,
ChoJin