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

[meggahertz]

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
bitrate:         50kb/s
samples/symbol:    5
interp:          512
Tx Frequency:    99.1M
gr_buffer::allocate_buffer: warning: tried to allocate
   992 items of size 33. Due to alignment requirements
   4096 were allocated.  If this isn't OK, consider padding
   your structure to a power-of-two bytes.
   On this platform, our allocation granularity is 4096 bytes.
aO...............................................................
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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.

Thanks a bunch!


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