Dear all,
I met a a hot potato with LimeSdr mini. The testing grc is something like this:
all configurations were not changed within all tests except central-freq.
When we set the central freq at 400MHz and 700M, all seems OK.
When it was at 800M, the Tx calibrations got “MCU error 3” ERROR.
When it was at 1775M, 1890M, 2330M and 2660M, the Tx calibrations got “MCU error 5” ERRORS.
When it was at 1942.5M, the Tx calibration and Rx calibration got “MCU error 5” ERRORS all.
I tested all these frequencies on quit a few limesdr mini dangles, and their behavours were similiar between each other.
Why? How to remedy it?
HERE is a typical LOGGING:
LimeSuite Source (RX) info
##################
Connecting to device
##################
LimeSuite version: 19.04.0-unknown
gr-limesdr version: 2.1.4
##################
Device list:
Nr.:0 device:LimeSDR Mini, media=USB 3.0, module=FT601, addr=24607:1027, serial=1D53D60E0860F0
##################
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Reference clock 40.00 MHz
Using device: LimeSDR-Mini(1D53D60E0860F0) GW: 1.28 FW: 6
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): RF frequency set [RX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): RX LPF configured
INFO: device_handler::set_digital_filter(): GFIR LPF cannot be set to the requested bandwidth
digital filter CH0 [RX]: 3.2 MHz.
INFO: device_handler::set_gain(): set gain [RX] CH0: 50 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAW.
INFO: device_handler::calibrate(): Rx calibration finished
LimeSuite Sink (TX) info
##################
Connecting to device
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Previously connected device number 0 from the list is used.
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): GFIR LPF cannot be set to the requested bandwidth
set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): Selected TX path: Band 1
RF frequency set [TX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
TX LPF configured
INFO: device_handler::set_gain(): set gain [TX] CH0: 30 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [TX]: BAND1.
INFO: device_handler::calibrate(): Tx Calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
INFO: source_impl::init_stream(): source channel 0 (device nr. 0) stream setup done.
INFO: sink_impl::init_stream(): sink channel 0 (device nr. 0) stream setup done.
libusb: warning [libusb_exit] application left some devices open
Done
Generating: ‘/home/ubuntu/\xe6\xa1\x8c\xe9\x9d\xa2/top_block.py’
Executing: /usr/bin/python2 -u /home/ubuntu/桌面/top_block.py
LimeSuite Source (RX) info
##################
Connecting to device
##################
LimeSuite version: 19.04.0-unknown
gr-limesdr version: 2.1.4
##################
Device list:
Nr.:0 device:LimeSDR Mini, media=USB 3.0, module=FT601, addr=24607:1027, serial=1D53D60E0860F0
##################
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Reference clock 40.00 MHz
Using device: LimeSDR-Mini(1D53D60E0860F0) GW: 1.28 FW: 6
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): RF frequency set [RX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): RX LPF configured
INFO: device_handler::set_digital_filter(): GFIR LPF cannot be set to the requested bandwidth
digital filter CH0 [RX]: 3.2 MHz.
INFO: device_handler::set_gain(): set gain [RX] CH0: 50 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAH.
INFO: device_handler::calibrate(): Rx calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
LimeSuite Sink (TX) info
##################
Connecting to device
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Previously connected device number 0 from the list is used.
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): GFIR LPF cannot be set to the requested bandwidth
set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): Selected TX path: Band 1
RF frequency set [TX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
TX LPF configured
INFO: device_handler::set_gain(): set gain [TX] CH0: 30 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [TX]: BAND1.
INFO: device_handler::calibrate(): Tx Calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
INFO: source_impl::init_stream(): source channel 0 (device nr. 0) stream setup done.
INFO: sink_impl::init_stream(): sink channel 0 (device nr. 0) stream setup done.
libusb: warning [libusb_exit] application left some devices open
Done
Generating: ‘/home/ubuntu/\xe6\xa1\x8c\xe9\x9d\xa2/top_block.py’
Executing: /usr/bin/python2 -u /home/ubuntu/桌面/top_block.py
LimeSuite Source (RX) info
##################
Connecting to device
##################
LimeSuite version: 19.04.0-unknown
gr-limesdr version: 2.1.4
##################
Device list:
Nr.:0 device:LimeSDR Mini, media=USB 3.0, module=FT601, addr=24607:1027, serial=1D53D60E0860F0
##################
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Reference clock 40.00 MHz
Using device: LimeSDR-Mini(1D53D60E0860F0) GW: 1.28 FW: 6
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): RF frequency set [RX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): RX LPF configured
INFO: device_handler::set_digital_filter(): GFIR LPF cannot be set to the requested bandwidth
digital filter CH0 [RX]: 3.2 MHz.
INFO: device_handler::set_gain(): set gain [RX] CH0: 50 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAW.
INFO: device_handler::calibrate(): Rx calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
LimeSuite Sink (TX) info
##################
Connecting to device
INFO: device_handler::open_device(): no serial number. Using first device in the list.
Use “LimeUtil --find” in terminal to find prefered device serial.
Previously connected device number 0 from the list is used.
##################
INFO: device_handler::enable_channels(): SISO CH0 set for device number 0.
INFO: device_handler::set_samp_rate(): GFIR LPF cannot be set to the requested bandwidth
set sampling rate: 3.2 MS/s.
INFO: device_handler::set_rf_freq(): Selected TX path: Band 1
RF frequency set [TX]: 2600 MHz.
INFO: device_handler::set_analog_filter(): Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
TX LPF configured
INFO: device_handler::set_gain(): set gain [TX] CH0: 30 dB.
INFO: device_handler::set_antenna(): CH0 antenna set [TX]: BAND1.
INFO: device_handler::calibrate(): Tx Calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
INFO: source_impl::init_stream(): source channel 0 (device nr. 0) stream setup done.
INFO: sink_impl::init_stream(): sink channel 0 (device nr. 0) stream setup done.
libusb: warning [libusb_exit] application left some devices open
Done