Author Topic: 898c HD issues  (Read 8716 times)

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Offline sbgoodwin

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898c HD issues
« on: June 22, 2017, 06:48:35 PM »
There are actually two distinct problems we're having with our 898c.
1) NMEA Output
  NMEA output only works when powered by a automotive battery, NOT with our 14.8 Volt Lithium batteries.  I can't fathom why this could be -- specs are 10-20V, and it's not like I'm using an inverter, and am worried about waveform... right?  Any ideas why this is happening?

2) No GPS fix in SON files = can't export depths
Normally, I use NMEA output (see #1), but since that didn't work, I'm hoping to salvage the depth data by exporting it from the SON files.
On opening them, however, I noticed that they contain no GPS info at all.  Zero's straight across the board.  This in itself isn't a deal breaker, if I could only extract the depths at 5-second intervals from the SON files.  I used HumViewer, and it looks like it's going to do it, but then the csv never gets created. I'm wondering if this is because it needs GPS / track info in order to export depths?  I can see the depths are correct all the way through, so if I could just extract them somehow, this day of data collection could be recovered.  (All we're really using is depths -- no imagery).

A note that I'm wondering if the lack of GPS in #2 is also due to the battery issue.  Never had this problem before, when using car batteries.  We're using high quality (and expensive) Lithium Ion batteries, so I'm having a hard time figuring out why this would be happening.

Thanks for any pointers, especially for #2! I'm dreading the thought of redoing that day's work :-(

Offline rnvinc

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Re: 898c HD issues
« Reply #1 on: June 22, 2017, 09:57:37 PM »
I'm not going to be any help in this one  ...

If another member doesn't pop in with info you might call HB with the Lithium Ion battery question and no GPS fix  ...



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