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GNU Radio
1

Hi -

Sorry - hadn’t finished subscribing!

I’m new to GNU Radio - warning - it has been many years since I’ve done
much programing. Anyway, I managed to get FC5 running on my Compact PC,
downloaded gnu radio code via svn - most seemed to make. I ran
dial_tone.py
and had a dial tone coming out of the speaker - victory! So, I ordered
usrp
and some various Rx/Tx boards.

With TVRx install and antenna attached, running usrp_wfm_rcv.py -f 107.9
(from gnurdio-examples - WXKS in Boston - a strong station) I get a very
weak, if any peak at 107.9 - and nothing from speakers - am I doing
something dumb? Oh - when I plug power in - I get the fast blinking LED

when program runs - changes to slow blink -

Thanks
Doug

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2

On Tue, Aug 22, 2006 at 10:40:23AM -0700, DJCarlson wrote:

Hi -

Sorry - hadn’t finished subscribing!

I’m new to GNU Radio - warning - it has been many years since I’ve done
much programing. Anyway, I managed to get FC5 running on my Compact PC,
downloaded gnu radio code via svn - most seemed to make. I ran dial_tone.py
and had a dial tone coming out of the speaker - victory! So, I ordered usrp
and some various Rx/Tx boards.

Welcome!

With TVRx install and antenna attached, running usrp_wfm_rcv.py -f 107.9
(from gnurdio-examples - WXKS in Boston - a strong station) I get a very
weak, if any peak at 107.9 - and nothing from speakers - am I doing
something dumb? Oh - when I plug power in - I get the fast blinking LED -
when program runs - changes to slow blink -

Does is say anything about “failed to set frequency”?

Do you have more than one Rx daughterboard installed, or just the TV_RX?

Try this:

$ usrp_fft.py -f 107.9M -d 16

This should show you 4 MHz of spectrum centered on 107.9 MHz.
There should be a bunch of stations visible.

Try adjusting the gain, too.

What kind of antenna are you using? I’ve had good luck with an
el-cheapo “FM dipole” from my local drug store, radio shack, etc.

Eric

3

Thanks for the help -

With just TVRX installed - and a radioshack FM antenna that I use on my
stereo, running:

usrp_fft.py -f 107.9M -d 16

I get a weak peak at 0.0 and another weak peak at -1.25 (maybe WMJX
106.7?)

  • that is it

Does not say "failed to set frequecy - the 107.9 is if freq box -

power down and install basic RX board with same command - I get a peak
at
0.0 (noise between -30 and -20 dB - Signal peak @ -8dB

Running usrp_wfm_rcv.py -f 107.9 with either board produces same results
discribed earilier -

Thoughts?

Thanks -

Doug

Eric B. wrote:

dial_tone.py

This should show you 4 MHz of spectrum centered on 107.9 MHz.

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4

On Tue, Aug 22, 2006 at 03:41:11PM -0700, DJCarlson wrote:

Does not say "failed to set frequecy - the 107.9 is if freq box -

power down and install basic RX board with same command - I get a peak at
0.0 (noise between -30 and -20 dB - Signal peak @ -8dB

Running usrp_wfm_rcv.py -f 107.9 with either board produces same results
discribed earilier -

Thoughts?
Thanks -

Can you try just sticking a 3 foot piece of solid conductor wire into
the F-connector?

Eric