- 1x BT-200 Bias-tee Low Noise Amplifier
- bladeRF xA4 & bladeRF xA9
- Micro Enclosure
- External Power Supply (recommended)
- Frequently Asked Questions
- Features Mini-Circuits TSS-53LNB+ MMIC Low Noise Amplifier – 50MHz to 5GHz MMIC
- Power consumption: 300mW
- Green LED power indicator
- Ultra low Noise Figure: <1.8dB
- Gain: +21dB @ 200MHz, +19dB @ 2.4GHz, +15dB @ 5GHz
- LNA enters bypass mode when port is unpowered (4dB IL)
- Enable module:
set biastee rx on
- Disable module:
set biastee rx off
- Query system power consumption:
The BT-200 is a wideband bias-tee RX Low Noise Amplifier that draws its current from the bladeRF 2.0 micro’s SMA connectors. The BT-200 is a compact LNA solution useful for substantially lowering the noise figure and substantially increasing dynamic range of most applications. bladeRF-cli and the libbladeRF API can be used to enable and disable the bias-tee when it is needed. Care should be taken to avoid overdrawing current when powering the bladeRF 2.0 micro from USB bus power and enabling multiple bias-tee amplifiers simultaneously. In case the power budget (
print hardware in bladeRF-cli) is a concern, the bladeRF 2.0 micro can be powered by an external DC power supply.
The BT-200 is backwards compatible with the bladeRF 1.0 and other transceivers. However, J3 must be populated and FB1 may need to be removed to prevent back-feeding DC voltage into ESD diodes and other sensitive circuitry that may exist and cause damage. Check the SDR’s schematic to determine the necessary precautions. Connect a +5VDC supply to J3.1 and ground to J3.2. Refer to the schematic for details.
NOTE: The BT-200 can only be plugged into the RX ports.
Frequently Asked Questions:
How can I tell if the LNA is enabled?
A green light will appear on the BT-200 if the program or tool you are using enables the bias-tee. In addition to the command line commands listed above, add “biastee=rx” to gr-osmosdr source blocks to enable BT-200 from within GNU Radio.
How many BT modules can be added to the bladeRF 2.0 micro?
All 4 ports of the bladeRF 2.0 micro are powered, so any and all RF ports can have a bias-tee module installed and powered.