I did a complete re-install on my pi 3 yesterday.
Installed RPI v0.10.0 NOOBS
Updated Raspian
Updated openplotter to 15.1
When I now ran calibration of SDR I got -37 ppm. Tried again after the SDR had warmed up and got -38 ppm.
With this ppm setting I did not get a single ship on the AIS. I remembered that the calibration had been around +48 ppm before, so I used this and voila!
(OpenCPN is running on my phone and I send the AIS and GPS data over bluetooth :-)
I conclude that there is something wrong with the calibration software...
If there are boats with AIS-transmitters in your harbour, then I guess you will be able to pick them up with the supplied antenna, but it is designed for a completely different frequency.
I have tested the following antennas:
http://www.metzcommunication.com/manta6.htm
https://www.aliexpress.com/item/2016-NEW...87854.html
https://www.aliexpress.com/item/2016-New...38821.html
The big expensive works best, but the small cheap ones from aliexpress works OK if you use a ground plane for the antenna (fasten the antenna to a metal plate).
Installed RPI v0.10.0 NOOBS
Updated Raspian
Updated openplotter to 15.1
When I now ran calibration of SDR I got -37 ppm. Tried again after the SDR had warmed up and got -38 ppm.
With this ppm setting I did not get a single ship on the AIS. I remembered that the calibration had been around +48 ppm before, so I used this and voila!
(OpenCPN is running on my phone and I send the AIS and GPS data over bluetooth :-)
I conclude that there is something wrong with the calibration software...
If there are boats with AIS-transmitters in your harbour, then I guess you will be able to pick them up with the supplied antenna, but it is designed for a completely different frequency.
I have tested the following antennas:
http://www.metzcommunication.com/manta6.htm
https://www.aliexpress.com/item/2016-NEW...87854.html
https://www.aliexpress.com/item/2016-New...38821.html
The big expensive works best, but the small cheap ones from aliexpress works OK if you use a ground plane for the antenna (fasten the antenna to a metal plate).