BladeRF x115 / YateBTS / Noise
Posted: Fri Apr 10, 2015 4:46 am
Hello,
Could you please help me (or point me to the appropriate tools) to reduce the "noise" on the board... What is the best tool(s) to (re)calibrate the board.
Serial #: 13d7b32e83118203e3e6db0b04de23bf
VCTCXO DAC calibration: 0x91b1
FPGA size: 115 KLE
FPGA loaded: yes
USB bus: 4
USB address: 2
USB speed: SuperSpeed
Backend: libusb
Instance: 0
bladeRF> version
bladeRF-cli version: 1.1.2-git-0295340
libbladeRF version: 1.2.1-git-0295340
Firmware version: 1.8.0
FPGA version: 0.1.2
I run some tests using yatebts and the connection was very unstable...
===================================
mbts noise
noise RSSI is -13 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
mbts rxgain
current RX gain is 0 dB
===================================
-13db is the minimum reachable on the board.
I tried to calibrate the board with "kalibrate-bladeRF", and it looks even worse.
./src/kal -s GSM850 -m4
Actual filter bandwidth = 1500 kHz
rxvga1 = 20 dB
rxvga2 = 30 dB
kal: Scanning for GSM-850 base stations.
GSM-850:
chan: 128 (869.2MHz - 1.362kHz) power: 35627.82
chan: 129 (869.4MHz - 1.349kHz) power: 37119.38
chan: 130 (869.6MHz - 1.382kHz) power: 37840.33
./src/kal -v -c 128
Found lowest offset of 264.594208Hz at 869.200000MHz (0.304411 ppm) using DAC trim 0x8fff
=====
Thank you,
Could you please help me (or point me to the appropriate tools) to reduce the "noise" on the board... What is the best tool(s) to (re)calibrate the board.
Serial #: 13d7b32e83118203e3e6db0b04de23bf
VCTCXO DAC calibration: 0x91b1
FPGA size: 115 KLE
FPGA loaded: yes
USB bus: 4
USB address: 2
USB speed: SuperSpeed
Backend: libusb
Instance: 0
bladeRF> version
bladeRF-cli version: 1.1.2-git-0295340
libbladeRF version: 1.2.1-git-0295340
Firmware version: 1.8.0
FPGA version: 0.1.2
I run some tests using yatebts and the connection was very unstable...
===================================
mbts noise
noise RSSI is -13 dB wrt full scale
MS RSSI target is -50 dB wrt full scale
mbts rxgain
current RX gain is 0 dB
===================================
-13db is the minimum reachable on the board.
I tried to calibrate the board with "kalibrate-bladeRF", and it looks even worse.
./src/kal -s GSM850 -m4
Actual filter bandwidth = 1500 kHz
rxvga1 = 20 dB
rxvga2 = 30 dB
kal: Scanning for GSM-850 base stations.
GSM-850:
chan: 128 (869.2MHz - 1.362kHz) power: 35627.82
chan: 129 (869.4MHz - 1.349kHz) power: 37119.38
chan: 130 (869.6MHz - 1.382kHz) power: 37840.33
./src/kal -v -c 128
Found lowest offset of 264.594208Hz at 869.200000MHz (0.304411 ppm) using DAC trim 0x8fff
=====
Thank you,