Re: [Discuss-gnuradio] "check topology failed"

[ChoJin]

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