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Re: [Discuss-gnuradio] sampling frequency

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] sampling frequency
Date: Sat, 09 Apr 2011 23:53:34 -0400
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On 04/09/2011 11:28 PM, ranjini ram wrote:
am using WBX daughter board...

On Sun, Apr 10, 2011 at 5:26 AM, Marcus D. Leech <address@hidden> wrote:
What type of daughter card?

FM broadcast radio is generally about 200khz wide so you need at least that much bandwidth.

There's already a wideband-FM receiver example--you could look at the usrp2_wfm.py example
   in .../gnuradio/gnuradio-examples/python/usrp2.

I'd use a USRP2-to-host bandwidth of 250KHz.

You can create a simple FM receiver within GRC in about 10 minutes, since there's already an
  FM demodulator block--although it would just be monophonic.  You'd need more sophisticated
  processing to do FM stereo--and I think someone posted such a flow-graph last week on this list.

The WBX card is tunable from 50MHz to 2.2GHz, so you should be easily able to tune the standard
  North American FM broadcast band, and use a small antenna going into the RF port.

If your flow-graph is RX-only, I think the UHD code will use the TX/RX port by default for your
  RX signal path.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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