Re: [gpsd-dev] PPS support

[Gary E. Miller]

Yo Hal!

On Sun, 05 Apr 2015 14:30:37 -0700
Hal Murray <address@hidden> wrote:

> 
> address@hidden said:
> > I've been using the MR-350P (Not the SiRF IV model) and the
> > Garmin-18 LVC, both $50-ish.  You just need to look. 
> 
> Both of those units require some soldering and such.  That's fine for
> geeks, but not good enough for general usage.

Soldering preferred, but not required.

And most use the same mini-DIN connector.  Once you have a shim cable
with DB-9 and mini-DIN or JST you are set.  Funny that no one sells
same that has the PPS pin connnected.  I could certainly build a few
for anyone that cared.

> The MR-350P has a 1 microsecond PPS.  That isn't wide enough to work
> with some systems.  I don't know of any way to tell it to change
> that.  Do you?

I have never had any problem with pulse width.  At least since gpsd
was fixed for small pulses long ago.  I do have problems with a
lot of serial input not handing the 'TTL" levels from some GPS.

> I doubt if you can still get the non SiRF IV model any more.  I found
> one web site that said it had been discontinued by the manufacturer.

They are still on the USGlobalSat products page.  They are quick to 
remove old products.

> (There might be a few still on some dusty shelves.)

If you order with extreme care you can get them.  Just be sure your vendor
does not ship the wrong one.

>  Does the SiRF IV
> work with GPSD if you run it in NMEA mode?

Yes, but no PPS, and crappy sensisivity.

> The BR-355-S4 is probably a few $ cheaper.  I don't know about the
> PPS width.

No.  No PPS.  I have one here.  Someday I'll break the sealed case and
fix it.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588