On Sun, Feb 23, 2014 at 4:17 AM, Ray Wells <[email protected]> wrote:
> Hi Lee, > > It didn't competely dawn on me during early use of of the Pi that the > supply that was most reliable was the 5.22v mobile phone charger. Back then > I couldn't do extended running on that ps because it belonged to the phone > of SWMBO and she needed it every second day. Also back then I didn't > measure the voltage of that supply, I took its 5v on face value. It was > only when the DTV dongle crashed so soon and repeatedly on other supplies, > including clean, linear supplies, that I checked the phone charger more > closely. > > The adsb Pi is now running from a Murata smps that delivers 5.0v but, that > Pi has the polyfuses shorted to keep USB voltage as high as possible. The > new Pi is running from a linear supply set to 5.1v and that puts an > adequate voltage on the USB sockets - 4.85v from memory. > > You might have a point about cpu loading being in the equation. FWIW > dixprs uses around 33% of cpu. Load average on that Pi is constantly around > the 1.0 mark but fpac contributes a bit to that. The adsb Pi on the other > hand shows load average of around 0.4. > > I await the outcome of you running higher supply voltage. > > Ray vk2tv I took the lazy way out and ordered a 5.1v power supply that is supposedly designed for the "special needs" of the Raspberry Pi. I believe it's rated at 5.1v at 1.5 amps. It took a long time because it was shipped from the UK, but it seems to be paying off. I'm at 17 and a half days now using Dixprs as an Igate. It never lasted more than 14 in that mode before, and typically it was only 10-11 days. I'll run it a bit longer to be sure - then I'll add ldsped into the equation. With ldsped running, it usually took just a few days to crash. If that's stable, I'll finally be able to fire up Xastir and APRSIS32 on other computers in the network and share the TNC with the Pi - knock on wood - with no more crashing. Lee - K5DAT _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
