2020-10-25, 11:08 PM
I was browsing the web when I reached this video posted 3 months ago by a radio ham operator : KMACK
If I understood clearly, the fact to activate an USB3.0 port resulted repeatedly in the loss of GPS signals on his RPi4, so I wonder if this was not the cause of my almost passed week agony
I am using an USB3.0 SSD, and I had noted also the problem was not showing up, never, when using an SD card instead...
My GPS pucks has a rather thin cable (with no much shielding, may be none!) 2 m length, and it was located at around 90 cm of my Pi4. I first moved it to a longer distance(~ 1.8m).
I plugged the USB 3.0 disk in an USB 2.0 port, I did all updates (OP 2.5.0, OpenCPN 5.2.4), activated signal K connection, and, at each start-up,
A STEADY FIX IS NOW REPEATEDLY REACHED BEFORE THE O-CHARTS MESSAGE IS DISPLAYED !!!
After a generous whiskey shot
, I reconnected the USB Disk to an USB 3.0 port, to see what happens, so far so good...
Sailoog, you were right suspecting gps signal quality, but the problem was not in the sky viewing, but in RF interference with the RPi4 own USB3 circuitry !
OK, that was probably the source of the issue, we can take for highly probable in Raspberry Pi4 than RF interference caused by the USB3.0 circuitry vicinity can corrupt the GPS signals, specially when the GPS, or its antenna (?), is close to the RPii4 ...
If I understood clearly, the fact to activate an USB3.0 port resulted repeatedly in the loss of GPS signals on his RPi4, so I wonder if this was not the cause of my almost passed week agony
I am using an USB3.0 SSD, and I had noted also the problem was not showing up, never, when using an SD card instead...
My GPS pucks has a rather thin cable (with no much shielding, may be none!) 2 m length, and it was located at around 90 cm of my Pi4. I first moved it to a longer distance(~ 1.8m).
I plugged the USB 3.0 disk in an USB 2.0 port, I did all updates (OP 2.5.0, OpenCPN 5.2.4), activated signal K connection, and, at each start-up,
A STEADY FIX IS NOW REPEATEDLY REACHED BEFORE THE O-CHARTS MESSAGE IS DISPLAYED !!! After a generous whiskey shot
, I reconnected the USB Disk to an USB 3.0 port, to see what happens, so far so good... Sailoog, you were right suspecting gps signal quality, but the problem was not in the sky viewing, but in RF interference with the RPi4 own USB3 circuitry !
OK, that was probably the source of the issue, we can take for highly probable in Raspberry Pi4 than RF interference caused by the USB3.0 circuitry vicinity can corrupt the GPS signals, specially when the GPS, or its antenna (?), is close to the RPii4 ...
Cordialement
Didier B
Pi4, SSD USB3, OP 3.0 Touch SK 3.2.1 OpenCPN 5.8.4 : Thank you Thank you Thank you
Didier B
Pi4, SSD USB3, OP 3.0 Touch SK 3.2.1 OpenCPN 5.8.4 : Thank you Thank you Thank you