Re: [gpsd-dev] PPS over USB

[Dave Taht]

On Sun, May 6, 2012 at 3:48 PM, Gary E. Miller <address@hidden> wrote:
> Yo Terje!
>
> On Sun, 06 May 2012 23:56:38 +0200
> Terje Mathisen <address@hidden> wrote:
>
>> Eric S. Raymond wrote:
>>  > Gary E. Miller<address@hidden>:
>>  >> Ugh.  The Garmin 18s are unsuitable for indoor use.  The uBlox6
>>  >> in the GR-601W works well in my basement.
>>  >
>>  > And in my office.  Indoor usability is *strongly* desirable for
>>  > this application. Gary is right, the Garmin 18 would not be a good
>>  > match.
>>
>> The Garmin 18 was replaced by the 18x several years ago, wasn't it?
>
> Yes.  I have an 18x but not tried it yet.
>
>> My default at-home S1 server has the original 18 with rooftop
>> antenna, a hand-soldered (for PPS) SURE board works fine indoors.
>
> I did the same for years at my office.  The Garmin18 works fine when
> roof mounted.  Not so good on the side of my house.  So it was easier to
> buy a SiRFIII then to get the Garmin18 on my house roof.
>
>> BTW, I just picked up a NetGear 3800 for the BufferBloat firmware, I
>> intend to point that router at the local S1, which should result in
>> better timing than a PPS over USB solution.

I'm tickled. Stick with the current cero firmware tho... and we have
some cool new stuff happening in a week or two more. It did,
last I looked, run gpsd fine, you did have to do an opkg install of the
right kmod-serial-something.

> Yup.  I would guess 10x to 20x better from my recent experience.

Heh. Don't count your eggs before you measure. When a box is running flat out
97% of the time spent in the interrupt handler, god knows what will happen.

http://www.bufferbloat.net/projects/cerowrt/issues/379

There are always heisenbugs.

(note the above is against an unreleased version of cerowrt, running
 at the fastest speed yet achieved, where we found new problems)

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



-- 
Dave Täht
SKYPE: davetaht
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http://www.bufferbloat.net