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UHD Daughterboard Application Notes
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.. contents:: Table of Contents
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Daughterboard Properties
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The following contains interesting notes about each daughterboard.
Eventually, this page will be expanded to list out the full
properties of each board as well.
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Basic RX and LFRX
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The Basic RX and LFRX boards have 4 frontends:
* **Frontend A:** real signal on antenna RXA
* **Frontend B:** real signal on antenna RXB
* **Frontend AB:** quadrature frontend using both antennas (IQ)
* **Frontend BA:** quadrature frontend using both antennas (QI)
The boards have no tunable elements or programmable gains.
Through the magic of aliasing, you can down-convert signals
greater than the Nyquist rate of the ADC.
BasicRX Bandwidth:
* **For Real-Mode (A or B frontend)**: 250 MHz
* **For Complex (AB or BA frontend)**: 500 MHz
LFRX Bandwidth:
* **For Real-Mode (A or B frontend)**: 33 MHz
* **For Complex (AB or BA frontend)**: 66 MHz
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Basic TX and LFTX
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The Basic TX and LFTX boards have 4 frontends:
* **Frontend A:** real signal on antenna TXA
* **Frontend B:** real signal on antenna TXB
* **Frontend AB:** quadrature frontend using both antennas (IQ)
* **Frontend BA:** quadrature frontend using both antennas (QI)
The boards have no tunable elements or programmable gains.
Through the magic of aliasing, you can up-convert signals
greater than the Nyquist rate of the DAC.
BasicTX Bandwidth (Hz):
* **For Real-Mode (A or B frontend**): 250 MHz
* **For Complex (AB or BA frontend)**: 500 MHz
LFTX Bandwidth (Hz):
* **For Real-Mode (A or B frontend)**: 33 MHz
* **For Complex (AB or BA frontend)**: 66 MHz
^^^^^^^^^^^^^^^^^^^^^^^^^^^
DBSRX
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The DBSRX board has 1 quadrature frontend.
It defaults to direct conversion but can use a low IF through lo_offset in **uhd::tune_request_t**.
Receive Antennas: **J3**
* **Frontend 0:** Complex baseband signal from antenna J3
The board has no user selectable antenna setting.
Receive Gains:
* **GC1**, Range: 0-56dB
* **GC2**, Range: 0-24dB
Bandwidth: 8 MHz - 66 MHz
Sensors:
* **lo_locked**: boolean for LO lock state
^^^^^^^^^^^^^^^^^^^^^^^^^^^
DBSRX2
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The DBSRX2 board has 1 quadrature frontend.
It defaults to direct conversion, but can use a low IF through lo_offset in **uhd::tune_request_t**.
Receive Antennas: **J3**
* **Frontend 0:** Complex baseband signal from antenna J3
The board has no user-selectable antenna setting.
Receive Gains:
* **GC1**, Range: 0-73dB
* **BBG**, Range: 0-15dB
Bandwidth (Hz): 8 MHz -80 MHz
Sensors:
* **lo_locked**: boolean for LO lock state
^^^^^^^^^^^^^^^^^^^^^^^^^^^
RFX Series
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The RFX Series boards have 2 quadrature frontends: Transmit and Receive.
Transmit defaults to low IF, and Receive defaults to direct conversion.
The IF can be adjusted through lo_offset in **uhd::tune_request_t**.
The RFX Series boards have independent receive and transmit LO's and synthesizers
allowing full-duplex operation on different transmit and receive frequencies.
Transmit Antennas: **TX/RX**
Receive Antennas: **TX/RX** or **RX2**
* **Frontend 0:** Complex baseband signal for selected antenna
The user may set the receive antenna to be TX/RX or RX2.
However, when using an RFX board in full-duplex mode,
the receive antenna will always be set to RX2, regardless of the settings.
Receive Gains: **PGA0**, Range: 0-70dB (except RFX400 range is 0-45dB)
Bandwidth:
* **RX**: 40 MHz
* **TX**: 40 MHz
Sensors:
* **lo_locked**: boolean for LO lock state
^^^^^^^^^^^^^^^^^^^^^^^^^^^
XCVR 2450
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The XCVR2450 has 2 quadrature frontends, one transmit, one receive.
Transmit and Receive default to direct conversion but
can be used in low IF mode through lo_offset in uhd::tune_request_t.
The XCVR2450 has a non-contiguous tuning range consisting of a
high band (4.9-6.0 GHz) and a low band (2.4-2.5 GHz).
Transmit Antennas: **J1** or **J2**
Receive Antennas: **J1** or **J2**
* **Frontend 0:** Complex baseband signal for selected antenna
The XCVR2450 uses a common LO for both receive and transmit.
Even though the API allows the RX and TX LOs to be individually set,
a change of one LO setting will be reflected in the other LO setting.
The XCVR2450 does not support full-duplex mode, attempting to operate
in full-duplex will result in transmit-only operation.
Transmit Gains:
* **VGA**, Range: 0-30dB
* **BB**, Range: 0-5dB
Receive Gains:
* **LNA**, Range: 0-30.5dB
* **VGA**, Range: 0-62dB
Bandwidths:
* **RX**: 15 MHz, 19 MHz, 28 MHz, 36 MHz; (each +-0, 5, or 10%)
* **TX**: 24 MHz, 36 MHz, 48 MHz
Sensors:
* **lo_locked**: boolean for LO lock state
* **rssi**: float for rssi in dBm
^^^^^^^^^^^^^^^^^^^^^^^^^^^
WBX Series
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Features:
* 2 quadrature frontends (1 transmit, 1 receive)
* Defaults to direct conversion
* Can be used in low IF mode through lo_offset with **uhd::tune_request_t**
* Independent recieve and transmit LO's and synthesizers
* Allows for full-duplex operation on different transmit and receive frequencies
* Can be set to use Integer-N tuning for better spur performance with **uhd::tune_request_t**
Transmit Antennas: **TX/RX**
Receive Antennas: **TX/RX** or **RX2**
* **Frontend 0:** Complex baseband signal for selected antenna
* **Note:** The user may set the receive antenna to be TX/RX or RX2. However, when using a WBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings.
Transmit Gains: **PGA0**, Range: 0-25dB
Receive Gains: **PGA0**, Range: 0-31.5dB
Bandwidths:
* **WBX**: 40 MHz, RX & TX
* **WBX-120**: 120 MHz, RX & TX
Sensors:
* **lo_locked**: boolean for LO lock state
^^^^^^^^^^^^^^^^^^^^^^^^^^^
SBX Series
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Features:
* 2 quadrature frontends (1 transmit, 1 receive)
* Defaults to direct conversion
* Can be used in low IF mode through lo_offset with **uhd::tune_request_t**
* Independent recieve and transmit LO's and synthesizers
* Allows for full-duplex operation on different transmit and receive frequencies
* Can be set to use Integer-N tuning for better spur performance with **uhd::tune_request_t**
Transmit Antennas: **TX/RX**
Receive Antennas: **TX/RX** or **RX2**
* **Frontend 0:** Complex baseband signal for selected antenna
* **Note:** The user may set the receive antenna to be TX/RX or RX2. However, when using an SBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings.
Transmit Gains: **PGA0**, Range: 0-31.5dB
Receive Gains: **PGA0**, Range: 0-31.5dB
Bandwidths:
* **SBX**: 40 MHz, RX & TX
* **SBX-120**: 120 MHz, RX & TX
Sensors:
* **lo_locked**: boolean for LO lock state
LEDs:
* All LEDs flash when daughterboard control is initialized
* **TX LD**: Transmit Synthesizer Lock Detect
* **TX/RX**: Receiver on TX/RX antenna port (No TX)
* **RX LD**: Receive Synthesizer Lock Detect
* **RX1/RX2**: Receiver on RX2 antenna port
^^^^^^^^^^^^^^^^^^^^^^^^^^^
CBX Series
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Features:
* 2 quadrature frontends (1 transmit, 1 receive)
* Defaults to direct conversion
* Can be used in low IF mode through lo_offset with **uhd::tune_request_t**
* Independent recieve and transmit LO's and synthesizers
* Allows for full-duplex operation on different transmit and receive frequencies
* Can be set to use Integer-N tuning for better spur performance with **uhd::tune_request_t**
Transmit Antennas: **TX/RX**
Receive Antennas: **TX/RX** or **RX2**
* **Frontend 0:** Complex baseband signal for selected antenna
* **Note:** The user may set the receive antenna to be TX/RX or RX2. However, when using a CBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings.
Transmit Gains: **PGA0**, Range: 0-31.5dB
Receive Gains: **PGA0**, Range: 0-31.5dB
Bandwidths:
* **CBX**: 40 MHz, RX & TX
* **CBX-120**: 120 MHz, RX & TX
Sensors:
* **lo_locked**: boolean for LO lock state
LEDs:
* All LEDs flash when daughterboard control is initialized
* **TX LD**: Transmit Synthesizer Lock Detect
* **TX/RX**: Receiver on TX/RX antenna port (No TX)
* **RX LD**: Receive Synthesizer Lock Detect
* **RX1/RX2**: Receiver on RX2 antenna port
^^^^^^^^^^^^^^^^^^^^^^^^^^^
TVRX
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The TVRX board has 1 real-mode frontend.
It is operated at a low IF.
Receive Antennas: RX
* **Frontend 0:** real-mode baseband signal from antenna RX
Receive Gains:
* **RF**, Range: -13.3-50.3dB (frequency-dependent)
* **IF**, Range: -1.5-32.5dB
Bandwidth: 6 MHz
^^^^^^^^^^^^^^^^^^^^^^^^^^^
TVRX2
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The TVRX2 board has 2 real-mode frontends.
It is operated at a low IF.
Receive Frontends:
* **Frontend RX1:** real-mode baseband from antenna J100
* **Frontend RX2:** real-mode baseband from antenna J140
Note: The TVRX2 has always-on AGC; the software controllable gain is the
final gain stage which controls the AGC set-point for output to ADC.
Receive Gains:
* **IF**, Range: 0.0-30.0dB
Bandwidth: 1.7 MHz, 6 MHz, 7 MHz, 8 MHz, 10 MHz
Sensors:
* **lo_locked**: boolean for LO lock state
* **rssi**: float for measured RSSI in dBm
* **temperature**: float for measured temperature in degC
^^^^^^^^^^^^^^^^^^^^^^^^^^^
DBSRX - Mod
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Due to different clocking capabilities,
the DBSRX will require modifications to operate on a non-USRP1 motherboard.
On a USRP1 motherboard, a divided clock is provided from an FPGA pin
because the standard daughterboard clock lines cannot provided a divided clock.
However, on other USRP motherboards, the divided clock is provided
over the standard daughterboard clock lines.
**Step 1: Move the clock configuration resistor**
Remove **R193** (which is 10 Ohms, 0603 size), and put it on **R194**, which is empty.
This is made somewhat more complicated by the fact that the silkscreen is not clear in that area.
**R193** is on the back, immediately below the large beige connector, **J2**.
**R194** is just below, and to the left of **R193**.
The silkscreen for **R193** is ok, but for **R194**,
it is upside down, and partially cut off.
If you lose **R193**, you can use anything from 0 to 10 Ohms there.
**Step 2: Burn a new daughterboard id into the EEPROM**
With the daughterboard plugged-in, run the following commands:
::
cd <install-path>/lib/uhd/utils
./usrp_burn_db_eeprom --id=0x000d --unit=RX --args=<args> --slot=<slot>
* **<args>** are device address arguments (optional if only one USRP device is on your machine)
* **<slot>** is the name of the daughterboard slot (optional if the USRP device has only one slot)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
RFX - Mod
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Older RFX boards require modifications to use the motherboard oscillator.
If this is the case, UHD software will print a warning about the modification.
Please follow the modification procedures below:
**Step 1: Disable the daughterboard clocks**
Move **R64** to **R84**. Move **R142** to **R153**.
**Step 2: Connect the motherboard blocks**
Move **R35** to **R36**. Move **R117** to **R115**.
These are all 0-Ohm, so if you lose one, just short across the appropriate pads.
**Step 3: Burn the appropriate daughterboard ID into the EEPROM**
With the daughterboard plugged-in, run the following commands:
::
cd <install-path>/lib/uhd/utils
./usrp_burn_db_eeprom --id=<rx_id> --unit=RX --args=<args> --slot=<slot>
./usrp_burn_db_eeprom --id=<tx_id> --unit=TX --args=<args> --slot=<slot>
* **<rx_id>** choose the appropriate RX ID for your daughterboard
* **RFX400:** 0x0024
* **RFX900:** 0x0025
* **RFX1800:** 0x0034
* **RFX1200:** 0x0026
* **RFX2400:** 0x0027
* **<tx_id>** choose the appropriate TX ID for your daughterboard
* **RFX400:** 0x0028
* **RFX900:** 0x0029
* **RFX1800:** 0x0035
* **RFX1200:** 0x002a
* **RFX2400:** 0x002b
* **<args>** are device address arguments (optional if only one USRP device is on your machine)
* **<slot>** is the name of the daughterboard slot (optional if the USRP device has only one slot)
