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Technical Support / PAW occasionally loses GPS signal
« on: May 25, 2018, 11:37:53 pm »
I've been using PAW for just over a year now, firstly with the inbuilt radar display and more recently with EasyVFR basic.
When using it with EVFR I noticed that occasionally the GPS lost signal. My PAW was using the standard USB GPS and is mounted under the base bar of my flexwing, rear of the transponder. Most of the time it got a good signal but occasionally it would lose and regain it - I guess because my legs shielded from time to time.
Mentioning this to Peter at Popham he suggested a separate GPS dongle which I bought and connected to PAW, placing it above the dashboard, just under the windscreen.
My next series of flights was a tour into Germany and for the first time I tried using SkyDemon.
All was good and I enjoyed the extra visibility of planes on the navigation display (although I think the antennae or filtering was off because I only saw relatively close targets).
But my problem was that on about 4 or 5 occasions I lost GPS connectivity on PAW. On each occasion I got a message on SD something like "lost GPS signal, 9 satellites found" (which makes no sense to me), and the only way to fix the issue seemed to be to reboot my PAW.
I tried leaving the PAW for a minute or so to see if it reconnected, but it never did, and powering off the power brick my PAW is connected to and turning it on again to force a PAW reboot was the only solution.
No obvious pattern to the loss of GPS signal, it happened once 30 seconds after takeoff, on other occasions it happened whilst in steady flight after an extended period of time.
As PAW lost the GPS this stopped SD navigation and also the GPS coming through to my Trig TT21.
On one occasion I was able to look at the PAW config on my phone. It showed green for all bar the GPS which was red. GPS showed "DGPS fix" mode=3D and Satellites=9
Any ideas? This was the first time I'd used the external GPS dongle so it could have had an intermittent fault or the plastic of the screen be shielding the GPS, but for almost all of the 25 hours of flying I did it worked perfectly and the screen and the SD error message still showed that it had a decent number of satellite fixes so I don't think that was it.
When using it with EVFR I noticed that occasionally the GPS lost signal. My PAW was using the standard USB GPS and is mounted under the base bar of my flexwing, rear of the transponder. Most of the time it got a good signal but occasionally it would lose and regain it - I guess because my legs shielded from time to time.
Mentioning this to Peter at Popham he suggested a separate GPS dongle which I bought and connected to PAW, placing it above the dashboard, just under the windscreen.
My next series of flights was a tour into Germany and for the first time I tried using SkyDemon.
All was good and I enjoyed the extra visibility of planes on the navigation display (although I think the antennae or filtering was off because I only saw relatively close targets).
But my problem was that on about 4 or 5 occasions I lost GPS connectivity on PAW. On each occasion I got a message on SD something like "lost GPS signal, 9 satellites found" (which makes no sense to me), and the only way to fix the issue seemed to be to reboot my PAW.
I tried leaving the PAW for a minute or so to see if it reconnected, but it never did, and powering off the power brick my PAW is connected to and turning it on again to force a PAW reboot was the only solution.
No obvious pattern to the loss of GPS signal, it happened once 30 seconds after takeoff, on other occasions it happened whilst in steady flight after an extended period of time.
As PAW lost the GPS this stopped SD navigation and also the GPS coming through to my Trig TT21.
On one occasion I was able to look at the PAW config on my phone. It showed green for all bar the GPS which was red. GPS showed "DGPS fix" mode=3D and Satellites=9
Any ideas? This was the first time I'd used the external GPS dongle so it could have had an intermittent fault or the plastic of the screen be shielding the GPS, but for almost all of the 25 hours of flying I did it worked perfectly and the screen and the SD error message still showed that it had a decent number of satellite fixes so I don't think that was it.