Hello,
Just to update, the UKRUF FLARM antenna is now connected using about 4 to 4.5 metres of HDF400 co-axial cable instead of the likely problematic USB extension cable.
A new FLARM RTLSDR USB card was supplied by Keith and is now in use plugged directly into the Raspberry Pi Top Left USB Port.
Ran the config yesterday, looked OK but was seeing a couple of messages as per below:
"WARNING: device 0 with serial number: 1090 cannot be found in dmesg log"
So today I performed a sudo reboot on the pi remotely then got this when I ran config again:
(15:53:52) FILESYS : Mount RW
Stopping Services
Do not plug in or remove any SDR dongles whilst this configuration script is running.
It is strongly advised to have the SDR's plugged in and then reboot the Pi before
running this configuration script.
Found 2 SDR's:
WARNING: Either an SDR has no serial number or two or more SDR's have identical serial numbers.
The configuration can only continue once all SDR's have unique serial numbers assigned.
The SDR's will now have their serial numbers changed to randomly assigned values and a reboot will be required.
If any of the SDR's are plugged into a powered USB hub then the hub will also need to be powered
down at the same time.
Proceed with updating the serial numbers and reboot [Y/n]: y
SDRs renamed, you should reboot now
Please rerun config afterwards
Do you want Reboot now [Y/n]: y
Following the second reboot, I re-ran config and the two "WARNING: device blah with serial number: blah cannot be found in dmesg log" messages have now gone.
(15:57:53) FILESYS : Mount RW
Stopping Services
Do not plug in or remove any SDR dongles whilst this configuration script is running.
It is strongly advised to have the SDR's plugged in and then reboot the Pi before
running this configuration script.
Found 2 SDR's:
USB Port Top Left : SDR detected ID=1 currently allocated to OGN/FLARM reception on 868Mhz
USB Port Bottom Left : no SDR detected
USB Port Top Right : no SDR detected
USB Port Bottom Right: SDR detected ID=0 currently allocated to ADS-B reception on 1090Mhz
One SDR is currently configured for OGN and the other is configured for ADS-B reception.
Do you wish to change the SDR(s) configuration [y/N]: N
Do you want to change the PAW Antenna Gain value (5) [y/N]: N
...
Test tuning of rtl-sdr device=1
...
Testing --ppm=-0 --gain=40
Capture @5ppm inrange=38 outrange=0
Frequency Capture Improvement = 37 -> 38
Receiver Xtal correction = 0-0.235 = -0.235 (0.086) ppm [90]
setting APRS_SDR_PPM=-0
setting APRS_SDR_GAIN=40
Testing --ppm=-0 --gain=45
Capture @5ppm inrange=36 outrange=0
Frequency Capture No Improvement
...
Found Rafael Micro R820T tuner
Exact sample rate is: 2000000.052982 Hz
Frequency = 920.000MHz..960.200MHz 2.000MHz step, 20 scans
Sampling rate = 2000000Hz = 2.000MHz
0.250sec per scan
FFT: 1024 bins, 1953.1Hz/bin, 0.256ms/slide
RTLSDR::Open(1,940100000,2000000) => Generic RTL2832U OEM, 940.100 MHz, 2.000 Msps
RTLSDR::Gain[29] = +0.0 +0.9 +1.4 +2.7 +3.7 +7.7 +8.7 +12.5 +14.4 +15.7 +16.6 +19.7 +20.7 +22.9 +25.4 +28.0 +29.7 +32.8 +33.8 +36.4 +37.2 +38.6 +40.2 +42.1 +43.4 +43.9 +44.5 +48.0 +49.6 [dB]
Open(1, 940100000, 2000000) OK
Tuner crystal correction set to 0 ppm
Tuner gain set to 40.0 dB (device reports 40.2 dB)
...
Receiver Xtal correction = 0-0.340 = -0.340 (0.298) ppm [139]
Note: when the receiver warms up the Xtal may drift 5-10ppm
########################## Summary ##########################
Station Name is : UKRUF
Station APRS Server is : aprs.glidernet.org:14580
Station Latitude is : 53.943130
Station Longitude is : -1.188770
Station Altitude AMSL [M] is : 24
Station Altitude GEOID [M] is : 49
Station SDR PPM is : -0
Station SDR Gain is : 40
Station SDR Freq Centr is : 940.800
########################## Summary ##########################
Starting Services
