RS232 jamming

[LePaul]

Hornet

The product I used to work for (The Capn nav software that all Coast Guard vessels have) got calls about that a lot from the civilian side.

While impractical for the air, we'd ask customers to "capture" the NMEA 0183 data in HyperTerminal, then email it to use.  Viewing the data, you could see that the coordinates would be fine, then show random odd readings several hundred miles away, then fine.  Our software would endure X amount of these random hits til declaring the GPS input as bad.

If it was bad all around, then we'd speculate about wiring (noise, etc).  But to have good data, then bad, then get it back, seemed to just be a bad spot in regards to signal coverage.

I dont know if the AIR GPSs have a means to debug like this, though.  Usually these would be posted as known problem areas.

[DREDIOCK]

Originally posted by Meatwad
Around here there is a big natural gas pipeline and an oil pipeline. When you pass over these in spray and spreader trucks, it temporally screws up the GPS and the guidance lightbars in the trucks.

Why would a pipeline cause that

Maybe its not really a pipeline.
Maybe they just want you to think that

[Hornet33]

Originally posted by LePaul
Hornet

The product I used to work for (The Capn nav software that all Coast Guard vessels have) got calls about that a lot from the civilian side.

While impractical for the air, we'd ask customers to "capture" the NMEA 0183 data in HyperTerminal, then email it to use.  Viewing the data, you could see that the coordinates would be fine, then show random odd readings several hundred miles away, then fine.  Our software would endure X amount of these random hits til declaring the GPS input as bad.

If it was bad all around, then we'd speculate about wiring (noise, etc).  But to have good data, then bad, then get it back, seemed to just be a bad spot in regards to signal coverage.

I dont know if the AIR GPSs have a means to debug like this, though.  Usually these would be posted as known problem areas.

You worked on the Capn program?? Man I hated that software. I used to get tech assist calls all the time about that thing. We were just starting to field CapnII when I retired. Software was alot better but the laptops HQ purchased for it sucked. Over 50% failure rate right out of the box on the hardware side. I tried to stay as far away from that project as I could.

[LePaul]

I was with em from 1999 til 2004, when I left we had been sending them the DNC versions with the chart quilting, etc.