Just my nickel,
I have been running a pi now for about 3 months. It has the TNCxPi
daughter board on it as well as the Edimax Thumbnail Wifi dongle and a
USB to RS232 converter that is plugged into a KPC3. Xasistr is
monitoring the TNCxPi and I login via Chicken of the VNC (OSX) and a
tight VNC server (serial to TNCxPi). I use the ax25 stack with I don't
remember what now on the KPC3 (it's late here). That listens to the ISS
downlink freq and logs packets for some sat data I am tracking.
Long story short, the whole mess is run off of a 12V cigarette adapter I
got from Lowes. Just tapped it into the same 12VDC that runs the radio
on the TNCxPi.
I also have a Pi that is running the AirPi daughter board and same wifi
that has been running about the same time off of a Lowes USB 2A/1A dual
output wall wart.
Both sell for around $8 and I have never put a voltmeter on either to
see what they are actually putting out. The only thing I have had
issues with is the NooElec SDR dongles. If they are on a USB extension,
they seem to crap out. Or if you have them mixed in with some low speed
devices (keyboards, mice, etc) power or not, they don't seem to like
that either.
Yet another Pi has been running dump1090 for about a month now with just
the RTL and thumbnail wifi on the same type of Lowes USB PS.
So, I guess you could say I like those PS units.
kw
KD5QYV
On 1/23/14 6:06 PM , Ray Wells wrote:
I had terrible stability problems with a Pi in service as an aprs
Igate. Ten days was the best I could get out of it before a crash but
the crash could have been after a couple of hours or so. The
installation was Wheezy with kernel ax25 compiled on the machine and
running dixprs as the gateway software. The Pi drove an approved
powered hub with 2A p/s and I used wi-fi to access the LAN. It was the
wi-fi that crashed every time. I moved away from the Pi because I
needed reliability. I had looked at power supply issues, but obviously
not in enough detail.
Months later I revisited the Pi for adsb and found that with with one
particular 700mA mobile charger the Pi was stable and the DTV dongle
was happy, without the need for a hub. If I moved to any of a number
of other supplies the adsb program dump1090 would crash within
seconds. The phone charger was putting 5.22v on the Pi whereas the
other supplies were just under 5v. It seemed obvious that there was a
supply issue. I ended up using a Murata 5v 1.5A smps to give me 5v but
I still wasn't happy with the voltage for the USB sockets when under
load. I shorted all Polyfuses on the Pi and have never looked back.
Current uptime is 16 days, following a forced mains reset for
something else.
Enthused by the adsb success I again put a Pi into service for the
aprs gateway. I tried another Murata smps but it was just under 5v and
I felt uneasy about that (low) supply voltage. I now have a linear
3.5A supply using an LM350, and adjusted to 5.1v. Again, I'm using
Wheezy with ax25 compiled on the machine and, dixprs. The only thing
plugged into the Pi is the four port USB/RS232 adaptor. Uptime is now
11 days and I feel confident about the stability.
My two running Pi's both use ethernet rather than wi-fi, the bridge to
the wireless LAN being via a D-Link wireless/ethernet bridge with two
ethernet ports.
I now believe that supply requirements for the Pi are more stringent
under some conditions than I would have believed.
Ray vk2tv
On 24/01/14 14:35, Lee Bengston wrote:
I thought I had a stability problem with my Raspberry Pi. However,
after
changing the IGate to use Xastir, I've completed over 19 days of
continuous
operation without a hitch. The previous software never lasted more
than 15
days before everything would freeze up. Sometimes I would only get
about
10 days before it would quit. I had to cycle the power in order to get
back up and running.
The other software package didn't quit on me like that when I used it
on an
x86 machine, so for a long time I blamed the Pi. Perhaps the issue is
related to a dependent library that is specific to the Raspbian
distribution - who knows. Anyway, good job, Xastir developers!
Lee - K5DAT
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