USRP Reference
From MyLabWiki
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 |
|
| 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.[4]
- 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 | |
| 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
 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. |
