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Implausible Time Records



 
 
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  #1  
Old May 5th 19, 04:38 PM posted to rec.aviation.soaring
Dan Marotta
external usenet poster
 
Posts: 4,601
Default Implausible Time Records

For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:
https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J
  #2  
Old May 5th 19, 04:49 PM posted to rec.aviation.soaring
JS[_5_]
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Posts: 624
Default Implausible Time Records

On Sunday, May 5, 2019 at 8:38:57 AM UTC-7, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:
https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J


Noticed it was from the vario. I'll use a vario file today and see...
Jim
  #3  
Old May 5th 19, 05:26 PM posted to rec.aviation.soaring
Dan Marotta
external usenet poster
 
Posts: 4,601
Default Implausible Time Records

Yes, it was from the vario which just started acting up.ツ* The ClearNav
II display's USB stick did not have the flight.ツ* I may have neglected to
download that.

Lately I've been getting a boatload of GPS drop outs.ツ* Maybe that's
because I'm close to the source of the interference testing or maybe
it's because I've cut my antennae cables to length in my cockpit.ツ* I now
seem to recall reading that one should not shorten the cables. I know
about reflections due to wavelength/transmission line length, but I was
unaware that that would affect reception.ツ* Do I need to acquire new
antennae?ツ* The antenna that came with my PF portable was 10 meters
long!ツ* Who needs a big bundle of cable under the panel?

On 5/5/2019 9:49 AM, JS wrote:
On Sunday, May 5, 2019 at 8:38:57 AM UTC-7, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:
https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J

Noticed it was from the vario. I'll use a vario file today and see...
Jim


--
Dan, 5J
  #4  
Old May 5th 19, 05:43 PM posted to rec.aviation.soaring
Tim Newport-Peace[_6_]
external usenet poster
 
Posts: 65
Default Implausible Time Records

At 16:26 05 May 2019, Dan Marotta wrote:
Yes, it was from the vario which just started acting up.ツ* The ClearNav
II display's USB stick did not have the flight.ツ* I may have neglected to


download that.

Lately I've been getting a boatload of GPS drop outs.ツ* Maybe that's
because I'm close to the source of the interference testing or maybe
it's because I've cut my antennae cables to length in my cockpit.ツ* I now


seem to recall reading that one should not shorten the cables. I know
about reflections due to wavelength/transmission line length, but I was
unaware that that would affect reception.ツ* Do I need to acquire new
antennae?ツ* The antenna that came with my PF portable was 10 meters
long!ツ* Who needs a big bundle of cable under the panel?

On 5/5/2019 9:49 AM, JS wrote:
On Sunday, May 5, 2019 at 8:38:57 AM UTC-7, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what

this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:

https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J

Noticed it was from the vario. I'll use a vario file today and see...
Jim


--
Dan, 5J

Looking at the file, there is an out-of-sequence issue:

Checking File C:\Users\Public\Documents\GPS\2019-05-04-CNI-V8Q-01.IGC
---------------------------------------------------------------------
Out of Sequence Error -
B1903383458935N10559992WA0184701874001999104104113 000
B1903393458935N10600013WA0184901876001999112112116 000
B1903373458935N10600035WA0185101877001999115115119 000
B1903383458936N10600057WA0185301878001999119119122 000

Could this be the issue?



  #5  
Old May 5th 19, 06:06 PM posted to rec.aviation.soaring
Dan Marotta
external usenet poster
 
Posts: 4,601
Default Implausible Time Records

I don't see what you're seeing.ツ* But how could records be out of
sequence?ツ* Maybe because my position apparently reversed while
thermalling during a GPS outage and getting one or two hits and then
another drop out, etc.?

On 5/5/2019 10:43 AM, Tim Newport-Peace wrote:
At 16:26 05 May 2019, Dan Marotta wrote:
Yes, it was from the vario which just started acting up.テつ* The ClearNav
II display's USB stick did not have the flight.テつ* I may have neglected to
download that.

Lately I've been getting a boatload of GPS drop outs.テつ* Maybe that's
because I'm close to the source of the interference testing or maybe
it's because I've cut my antennae cables to length in my cockpit.テつ* I now
seem to recall reading that one should not shorten the cables. I know
about reflections due to wavelength/transmission line length, but I was
unaware that that would affect reception.テつ* Do I need to acquire new
antennae?テつ* The antenna that came with my PF portable was 10 meters
long!テつ* Who needs a big bundle of cable under the panel?

On 5/5/2019 9:49 AM, JS wrote:
On Sunday, May 5, 2019 at 8:38:57 AM UTC-7, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.テつ* Does anyone know what

this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:

https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J
Noticed it was from the vario. I'll use a vario file today and see...
Jim

--
Dan, 5J

Looking at the file, there is an out-of-sequence issue:

Checking File C:\Users\Public\Documents\GPS\2019-05-04-CNI-V8Q-01.IGC
---------------------------------------------------------------------
Out of Sequence Error -
B1903383458935N10559992WA0184701874001999104104113 000
B1903393458935N10600013WA0184901876001999112112116 000
B1903373458935N10600035WA0185101877001999115115119 000
B1903383458936N10600057WA0185301878001999119119122 000

Could this be the issue?




--
Dan, 5J
  #6  
Old May 5th 19, 08:05 PM posted to rec.aviation.soaring
Tim Newport-Peace[_6_]
external usenet poster
 
Posts: 65
Default Implausible Time Records

Dan,

Open your file with a text editor and search for "B190338"
This will put you in the right area.
In each record, after the letter B, the next six bytes are the time.

After B190339 the time jumps back to B190337, which is odd, and leads to
there being two records with a time of 190338, and also 190339.

Odd, but I have seen this before. Maybe you can avoid it in future by
setting a longer fix interval, even 2 seconds might help, but no promises.

I am not seeing any GPS outage around that time. This would be shown by the
Letter "A" in the 25th byte changing to a "V".

Although it does not help a lot, the sequence error seems to happen as you
left the ground, so I guess you were not reversing turns?

I'm not saying this is what OLC are complaining about, just that it is odd
and it might be.

Tim.
--

At 17:06 05 May 2019, Dan Marotta wrote:
I don't see what you're seeing.ツ* But how could records be out of
sequence?ツ* Maybe because my position apparently reversed while
thermalling during a GPS outage and getting one or two hits and then
another drop out, etc.?

On 5/5/2019 10:43 AM, Tim Newport-Peace wrote:
At 16:26 05 May 2019, Dan Marotta wrote:
Yes, it was from the vario which just started acting up.テつ* The

ClearNav
II display's USB stick did not have the flight.テつ* I may have

neglected
to
download that.

Lately I've been getting a boatload of GPS drop outs.テつ* Maybe that's
because I'm close to the source of the interference testing or maybe
it's because I've cut my antennae cables to length in my cockpit.テつ*

I
now
seem to recall reading that one should not shorten the cables. I know
about reflections due to wavelength/transmission line length, but I

was
unaware that that would affect reception.テつ* Do I need to acquire new
antennae?テつ* The antenna that came with my PF portable was 10 meters
long!テつ* Who needs a big bundle of cable under the panel?

On 5/5/2019 9:49 AM, JS wrote:
On Sunday, May 5, 2019 at 8:38:57 AM UTC-7, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC

warning
of implausible time records in the igc file.テつ* Does anyone know

what
this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:


https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J
Noticed it was from the vario. I'll use a vario file today and see...
Jim
--
Dan, 5J

Looking at the file, there is an out-of-sequence issue:

Checking File C:\Users\Public\Documents\GPS\2019-05-04-CNI-V8Q-01.IGC
---------------------------------------------------------------------
Out of Sequence Error -
B1903383458935N10559992WA0184701874001999104104113 000
B1903393458935N10600013WA0184901876001999112112116 000
B1903373458935N10600035WA0185101877001999115115119 000
B1903383458936N10600057WA0185301878001999119119122 000

Could this be the issue?




--
Dan, 5J


  #7  
Old May 18th 19, 05:19 PM posted to rec.aviation.soaring
Tom Kelley #711
external usenet poster
 
Posts: 306
Default Implausible Time Records

On Sunday, May 5, 2019 at 9:38:57 AM UTC-6, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:
https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J


I sent my CN XC IGC 5-5-19 flight to a friend which when I posted it to the OLC did the same compression as the 5-3-19 flight did. When he posted it, it showed normal....ya. Now the CN XC IGC flight on 5-15-19 did the same compression to the right. So, I used the Flarm IGC file again on the OLC.
See You shows the files are valid on the CN XC IGC loggers and when altitude is checked shows fine. OLC gives 2 green circles with all the CN XC files..

I never had this problem before until I did the last update over winter with the CN XC Vario IGC logger. Yesterday I sent T8 the IGC logger file from 5-15-19 and they will be looking into it.

On the 5-15-19 flight, I did have GPS drop out several times, but the Flarm IGC logger doesn't seem to get affected for the OLC. Also, had several F-16's fly by and a B-1B bomber come right under me. I do know where ever I fly, with my transponder, my altitude is always getting shown by certain folks playing war games. On the B-1B I couldn't see through the cockpit windows to see what color helmets they had on...........!

Best. Tom @711.
  #8  
Old May 18th 19, 06:42 PM posted to rec.aviation.soaring
Dan Marotta
external usenet poster
 
Posts: 4,601
Default Implausible Time Records

Is there a way to roll back to the previous versions of CN2 and CNvXC?

On 5/18/2019 10:19 AM, Tom Kelley #711 wrote:
On Sunday, May 5, 2019 at 9:38:57 AM UTC-6, Dan Marotta wrote:
For my last three flights I've been getting a message from OLC warning
of implausible time records in the igc file.ツ* Does anyone know what this
means and what I might do to correct the problem? I've asked the
question on the ClearNav forum but haven't gotten a reply yet.

Here's a link to the file if that helps:
https://www.dropbox.com/s/erm01jilim...8Q-01.IGC?dl=0
--
Dan, 5J

I sent my CN XC IGC 5-5-19 flight to a friend which when I posted it to the OLC did the same compression as the 5-3-19 flight did. When he posted it, it showed normal....ya. Now the CN XC IGC flight on 5-15-19 did the same compression to the right. So, I used the Flarm IGC file again on the OLC.
See You shows the files are valid on the CN XC IGC loggers and when altitude is checked shows fine. OLC gives 2 green circles with all the CN XC files.

I never had this problem before until I did the last update over winter with the CN XC Vario IGC logger. Yesterday I sent T8 the IGC logger file from 5-15-19 and they will be looking into it.

On the 5-15-19 flight, I did have GPS drop out several times, but the Flarm IGC logger doesn't seem to get affected for the OLC. Also, had several F-16's fly by and a B-1B bomber come right under me. I do know where ever I fly, with my transponder, my altitude is always getting shown by certain folks playing war games. On the B-1B I couldn't see through the cockpit windows to see what color helmets they had on...........!

Best. Tom @711.


--
Dan, 5J
  #9  
Old May 19th 19, 11:22 AM posted to rec.aviation.soaring
Tango Eight
external usenet poster
 
Posts: 962
Default Implausible Time Records

A possible work around is to download your flight using an alternate time interval. CN flight recorders store internally at one second, can d/l at user selectable intrval up to 8 sec (iirc).

Best,

Evan Ludeman
  #10  
Old May 19th 19, 03:30 PM posted to rec.aviation.soaring
Dan Marotta
external usenet poster
 
Posts: 4,601
Default Implausible Time Records

Thanks Evan.ツ* As a retired Systems Engineer, I've made a lot of work
arounds and they're not very satisfying.ツ* The problem needs to be fixed.

If it's from the GPS engine manufacturer, they should fix it.ツ* Do both
the vario and the CN2 computer use the same GPS?ツ* It seems unlikely that
both CN and LX would make the same error in their code.

I'll look into a longer download interval but how about my previous
question?ツ* Is there a way to roll back to the previous firmware versions.

On 5/19/2019 4:22 AM, Tango Eight wrote:
A possible work around is to download your flight using an alternate time interval. CN flight recorders store internally at one second, can d/l at user selectable intrval up to 8 sec (iirc).

Best,

Evan Ludeman


--
Dan, 5J
 




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