Difference between revisions of "USRP Reference"

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Note: Being a TV tuner, TVRX has 75 Ω input. When using 50 Ω cables and antenna, this will result in an SWR of ~ 1.5 (TBC), which is not that bad considering all other deficiencies of a TV tuner.
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* Being a TV tuner, TVRX has 75 Ω input. When using 50 Ω cables and antenna, this will result in an SWR of ~ 1.5 (TBC), which is not that bad considering all other deficiencies of a TV tuner.
 
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* I have measured the sensitivity to be between -123 ... -126 dBm (0.11 and 0.14 µV) using a CW signal, SSB receiver and RF gain set to 71.
I have measured the sensitivity to be between -123 ... -126 dBm (0.11 and 0.14 µV) using a CW signal, SSB receiver and RF gain set to 71.
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* The TVRX can only receive up to 6 MHz channels (NTSC channel?).
 
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The TVRX can only receive up to 6 MHz channels (NTSC channel?).
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== DBSRX ==
 
== DBSRX ==

Revision as of 21:02, 28 August 2010

This page provides an index containing technical data for the USRP and various daughterboards

Contents

USRP

Specifications (v1)
Rev 4.5
Power 6 V / _ mA
Size (mm) 160 x 160
Weight (g) 130


Power consumption (v1)
State DBSRX+TVRX DBSRX only
Switch ON 770 mA 600 mA
Start 1.60 A 1.37 A
Stop 900 mA 730 mA


The data coming from the USRP1 is ± 32767 as the floating point range. In the USRP2 we use ± 1.0[1].

In comparison, audio source and sink has range ± 1.0

Filtering

If the decimation is a factor of four there are two half-band filters + CIC filter, if it is a multiple of two (i.e. even, but not a factor of four) then there is only one half-band filter + CIC, and if it is an odd number, just a CIC filter[2].

RFX1200

Specifications
Rev 3.0
Frequency 1150 - 1450 MHz
Noise Figure 6-10 dB
TX Power 200 mW (23 dBm)
Antenna TX/RX and RX2
GPIO
Power __ V / __ mA
Size (mm) 142 x 69
Weight (g) 49

The AUX ADC is used to measure received signal level[3]. The AUX DACs are used to set gains on most of the daughterboards[3].

RFX2400

Specifications
Rev
Frequency 2.3 - 2.9 GHz
Noise Figure 6-10 dB
TX Power 50 mW (17 dBm)
Antenna TX/RX and RX2
GPIO
Power __ V / __ mA
Size (mm) 142 x 69
Weight (g) 49

The AUX ADC is used to measure received signal level[3]. The AUX DACs are used to set gains on most of the daughterboards[3].

TVRX

Specifications
Rev
Frequency 50 - 870 MHz
Noise Figure 8-10 dB
Antenna
GPIO
Power __ V / __ mA
Size (mm)
Weight (g) 78
  • Being a TV tuner, TVRX has 75 Ω input. When using 50 Ω cables and antenna, this will result in an SWR of ~ 1.5 (TBC), which is not that bad considering all other deficiencies of a TV tuner.
  • I have measured the sensitivity to be between -123 ... -126 dBm (0.11 and 0.14 µV) using a CW signal, SSB receiver and RF gain set to 71.
  • The TVRX can only receive up to 6 MHz channels (NTSC channel?).

DBSRX

Specifications
Rev 2.2
Frequency 800 - 2400 MHz
Noise Figure 3-5 dB
Antenna only one
GPIO
  • Antenna bias 6V, 500 mA
Power 6 V / __ mA
Size (mm)
Weight (g) 20

This receiver performs surprisingly well. Using the FFT spectrum analyser (avg. α = 0.07) we could detect a -132 dBm CW signal at 2.25 GHz, 250 kHz sampling bandwidth.

Channel Filter

The DBSRX has a programmable channel filter at the output that can be programmed within 1 and 60 MHz.

Python: u.subdev.set_bw(1e6) # set bandwidth to 1 MHz

C++: TBD
Channel filter set to 10 MHz.
Channel filter set to 1 MHz.

LFRX

Specifications
Rev 2.2
Frequency DC - 50 MHz
Antenna RX_A and RX_B
GPIO
Power __ V / __ mA
Size (mm) 69 x 63
Weight (g) 24
  • Input power level: +10 dBm will clip, more than +17dBm could cause damage.
  • With a good and matched antenna, LFRX can receive hamradio traffic without preamp, see http://www.youtube.com/watch?v=BF3VgsKdnUE
  • Subdevice0 is the antenna A, Subdevice1 is the antenna B. You can use both subdevice 0 and 1 at the same time on two different ddc inputs and tune them separately. These subdevices are used as real inputs, and the Q inputs to the ddc are set to zero. The third possibility is to use subdevice2 which treats the antenna A and B as a single complex input (I and Q), and connects them to the I and Q inputs of the DDC input0. When using subdevice2, you cannot use subdevice 0 and 1.[4]

LFTX

Specifications
Rev 2.2
Frequency DC - 50 MHz
Antenna TX_A and TX_B
GPIO
Power __ V / __ mA
Size (mm) 69 x 63
Weight (g) 24

WBX

Specifications
Rev 2
Frequency 50 MHz - 2.2 GHz
Noise Figure 5-6 db[5]
IIP2 40-55 dBm[5]
IIP3 5-10 dBm[5]
TX power 50-100mW up to 1 GHz
30-50 mW above 1 GHz
(adjustable)
Antenna
GPIO
DC Power 6 V / 1.1 A[6]
Size (mm)
Weight (g)

Became available in Jan 2010. Full duplex.


The AUX ADC is used to measure the temperature[3]. The AUX DACs are used to set gains on most of the daughterboards[3].

Receiver Sensitivity in CW

References

  1. Discuss-gnuradio mailing list, 22 Sep 2009
  2. Discuss-gnuradio mailing list, 26 Oct 2009
  3. 3.0 3.1 3.2 3.3 3.4 3.5 Email from Matt Ettus, http://lists.gnu.org/archive/html/discuss-gnuradio/2010-01/msg00321.html
  4. Email from Josh Blum, 21 Feb 2010
  5. 5.0 5.1 5.2 WBX Receiver Performance Plots, http://code.ettus.com/redmine/ettus/documents/show/16
  6. According to schematics 540 mA TX and 543 mA RX.