Lowest power of the signal that LFRX can receive

Dear all,

What is the lowest power of the signal that LFRX can receive?

Really appreciate any of your help

Yan

Dear all,

What is the lowest power of the signal that LFRX can receive?

Really appreciate any of your help

Yan

The LFRX has almost no gain, so you’re limited by the noise floor of the
ADC. In the USRP2, you can probably reliably detect
signals down to about -60dBm or so. In the USRP1, you need somewhat
more signal, about -50dBm or so. But those are
ballpark numbers. But it depends on the details, and what kind of
signals you’re trying to detect, and whether you want to
demodulate them, or merely detect their presence, etc.


Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

On Wed, Mar 16, 2011 at 1:07 AM, Marcus D. Leech [email protected]
wrote:

signals down to about -60dBm or so. In the USRP1, you need somewhat more
signal, about -50dBm or so. But those are
ballpark numbers. But it depends on the details, and what kind of signals
you’re trying to detect, and whether you want to
demodulate them, or merely detect their presence, etc.

Using a signal generator I could measure the “CW sensitivity” down to
about -90 dBm. Using a 2 kHz filter this produced a tone clear enough
for me to decode morse code. With a tuned vertical antenna ~10 meters
long, I get very good reception of AM broadcasting and ham radio
traffic around 7 MHz. I was using USRP1.

Alex

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