USRP Reference
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?).
- Nick Foster on TVRX gain[4]: "The TVRX gain is set via an analog pin and isn't even guaranteed to be monotonic, let alone accurate. It varies with temperature as well. I've tried to compensate for what I can, but the absolute gain really can't be controlled very tightly."
DBSRX
| Specifications | |
|---|---|
| Rev | 2.2 |
| Frequency | 800 - 2400 MHz |
| Noise Figure | 3-5 dB |
| Antenna | only one |
| GPIO |
|
| 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
 |
 |
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.[5]
- Sensitivity of LFRX measure to be between -102 and -97 dBm (1.8 and 3 µV) using a CW signal, SSB receiver and gain set to 20 dB.
LFTX
| Specifications | |
|---|---|
| Rev | 2.2 |
| Frequency | DC - 50 MHz |
| Antenna | TX_A and TX_B |
| GPIO | |
| DC Power | __ V / __ mA |
| RF Power | 3 dBm / 2 mW[6] |
| Size (mm) | 69 x 63 |
| Weight (g) | 24 |
- Subdev A:A is daughterboard in slot A, antenna A. It i a real subdevice and only the I channel of the DUC is connected[7].
- Subdev A:AB is daughterboard in slot A, antenna A and antenna B. I from the DUC is connected to A and Q to B[7].
WBX
| Specifications | |
|---|---|
| Rev | 2 |
| Frequency | 50 MHz - 2.2 GHz |
| Noise Figure | 5-6 db[8] |
| IIP2 | 40-55 dBm[8] |
| IIP3 | 5-10 dBm[8] |
| TX power | 50-100mW up to 1 GHz 30-50 mW above 1 GHz (adjustable) |
| Antenna | |
| GPIO | |
| DC Power | 6 V / 1.1 A[9] |
| 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
- WBX receiver sensitivity in CW
70 MHz using a -133 dBm CW signal.
145 MHz using a -130 dBm CW signal.
435 MHz using a -130 dBm CW signal.
1296 MHz using a -130 dBm CW signal.
1.6 GHz using a -130 dBm CW signal.
2.1 GHz using a -130 dBm CW signal.
2.2 GHz using a -130 dBm CW signal.
References
- ↑ Discuss-gnuradio mailing list, 22 Sep 2009
- ↑ Discuss-gnuradio mailing list, 26 Oct 2009
- ↑ 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
- ↑ Email Dec 21, 2010 - link TBD
- ↑ Email from Josh Blum, 21 Feb 2010
- ↑ Discuss-gnuradio mailing list, 25 Aug 2009
- ↑ 7.0 7.1 USRP Users List 27 Jan 2011
- ↑ 8.0 8.1 8.2 WBX Receiver Performance Plots, http://code.ettus.com/redmine/ettus/documents/show/16
- ↑ According to schematics 540 mA TX and 543 mA RX.
