?

? I don't see anything on PPS in the Direwolf manual.

Hi Ray,

?

Thanks for the link. I think my networked GPS (u-blox) has 1PPS. I haven't really checked it out. The Garmin GLO2 doesn’t have the capabilities. At least, that is what I gather from ppscheck. This project doesn't need it and hopefully the JS8CALL project doesn't either.

?

Fred N7FMH

?

-----Original Message-----

From: [email protected] [mailto:[email protected]] On Behalf Of Ray Wells

Sent: Friday, October 01, 2021 8:55 PM

To: [email protected]

Subject: Re: [direwolf] Repeating "GPSD: Location fix is now 2D/3D"

?

Fred,

?

I know you've done the hard yards and it's working for you but you may

still find this page about gpsd interesting.

?

FWIW I ran into the same 2D/3D problem as you but I can't remember which

(RS232) GPS (Garmin 18 series or older Ublox) I used at the time. I

ended up compiling GPSD from sources to get an updated version. But this

was near enough to two years ago.

?

Ray vk2tv

?

On 2/10/21 9:18 am, Fred Hillhouse wrote:

>?

> Hi David,

>?

>?

>?

> Thanks for the update and how strange if this was a gpsd thing.? What

> version were you running before?

>?

> Version 3.17

>?

> Gary’s comment: Wow, that is 4 years old.? You need to update that.

> 3.23.1 is current.

>?

> I am not sure but came from the apt repository. I didn’t install gpsd

> initially on this RPI. I wouldn’t have done a build from source.

>?

> Do you know what was the specific fix in the newer GPSD that resolved

> your problem?

>?

> Sorry I don’t.

>?

> Best regards,

>?

> Fred N7FMH

>?

> --David

> KI6ZHD

>?

> On 10/01/2021 02:30 PM, Fred Hillhouse wrote:

>?

>? ? Problem has been resolved. I now get a solid 3D fix.

>?

>? ? The solution: update to the latest revision of GPSD. Revision 3.23.1

>?

>? ? As background, I have a Garmin GLO 2 which will support up to four

>? ? users. A similar unit is the Dual XGPS160. I have used it in the

>? ? past for an Android tablet with the hopes of also sharing with an

>? ? RPi. Currently, The tablet, RPI and my PC are receiving data.

>?

>? ? I was asked why I would use a GPS like this. When running multiple

>? ? RPIs, which may not have sky view, a GPS with a view can share

>? ? with each.

>?

>? ? Best regards,

>?

>? ? Fred N7FMH

>?

>? ? *From:*[email protected] <mailto:[email protected]>

>? ? [mailto:[email protected] <mailto:[email protected]>] *On Behalf

>? ? Of *Fred Hillhouse

>? ? *Sent:* Wednesday, September 29, 2021 5:06 PM

>? ? *To:* [email protected] <mailto:[email protected]>

>? ? *Subject:* Re: [direwolf] Repeating "GPSD: Location fix is now 2D/3D"

>?

>? ? GPS has been running for at least a day.

>?

>?

>? ? Define "GPS has been running for at least a day".? By default,

>? ? your GPS puck won't be activated by gpsd and start listening for

>? ? GPS details until it has a listening client like direwolf, cgps,

>? ? gpsmon, etc.? This seems to be a default for minimizing power

>? ? consumption.? The gpsmon tool doens't show how long it's been

>? ? running with a 3D fix but cgps does.

>?

>? ? The GPS has had a device connected to a device. It supports 4

>? ? different devices. One device is the same RPi Direwolf is running

>? ? on but is an terminal window on my PC with /cgps /running. Now a

>? ? second device (PC/u-center) is connected.

>?

>? ? What constitutes a “very good” lock?

>?

>?

>? ? That's evidently a huge topic in itself and is well outside the

>? ? scope of this Direwolf.? I did a search for "gpsd 3d lock" and

>? ? this hit seems like a good start:

>?

>? ?

>? ? <>

>?

>? ? A key point in that article is that though your system lists it's

>? ? using X satellites, it doesn't mean it's hearing them well.? This

>? ? can be due to local RF interference, etc.

>?

>? ? I can see I have a 3D position all the time now that my Windows PC

>? ? is connected. I am aware of the FIX differences and how everything

>? ? can affect the satellite signal; trees buildings, angle of

>? ? antenna, etc. Not being snarky! If this was a serial GPS or a

>? ? USB-GPS (serial?) there would be no BT layer and for serial, using

>? ? /dev/ttyS0 would be correct and USB would be similar. Based on an

>? ? exchange with Robert KB8RCO it seems this maybe the case here. If

>? ? may be that each of the four possibilities need /dev/ttys0-3? In

>? ? the end, I will have learned a little more.

>?

>? ? This is what I get when running /gpsmon/. Any clues there?

>?

>?

>? ? More information is available in cgps but there are other tools

>? ? available to troubleshoot GPS issues such as gpsprof but I've

>? ? never used them.? Ultimately, I don't think your issue is with

>? ? Direwolf.. it's going to be somewhere in the GPS into GPSD area.

>? ? I would start here:

>? ? <>

>?

>? ? I will certainly check this group. From my PC experience on

>? ? needing to actually connect to a COM port, I wonder if a RPi

>? ? “comport” must be connected as well. Robert, KB8RCO, suggested

>? ? something regarding auto-connecting at reboot but I haven’t chased

>? ? that since the basic connection is not functional yet.

>?

>? ? Thank you!

>?

>? ? Fred N7FMH

>?

>?

>? ? Screenshots from the u-blox u-center app:

>?

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