On 7/8/20 4:40 PM, Hal Murray wrote:
stevesommars...@gmail.com said:
My RPi4 (Raspbian Buster) has a GPS+PPS/USB. Serial->USB uses Prolific
PL2303, which supports USB 2.0
which means 1 msec polling of the PPS signal. I've been unable to poll more
frequently
As far as I know, the
stevesommars...@gmail.com said:
> My RPi4 (Raspbian Buster) has a GPS+PPS/USB. Serial->USB uses Prolific
> PL2303, which supports USB 2.0
> which means 1 msec polling of the PPS signal. I've been unable to poll more
> frequently
As far as I know, the PL2303, 067b:2303, is an old/slow chip.
Hello Time-Nuts,
I have uploaded some pictures and reverse engineered schematic
information for the Austron/Datum 1150 oscillator to the KO4BB
website. It is currently in the recently uploaded files area.
I did this work a long time ago and have just now got around uploading to it.
There is a
My RPi4 (Raspbian Buster) has a GPS+PPS/USB. Serial->USB uses Prolific
PL2303, which supports USB 2.0
The PPS jitter is 1 msec (e.g., using ppstest). lsusb -v shows:
Bus 001 Device 008: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
Port
bInterval 1
which means 1
Very good! I learned a bunch of things!
My suggestions for the earlier parts of the presentation:
- The discussion at the end of the "Types of Noise" slide should be
earlier, very near the beginning of the presentation. That is, start by
giving Context for why metrology has special requirements
On Dienstag, 7. Juli 2020 18:27:01 CEST Petr Titěra wrote:
> Timing on USB need not to be so horrible. Below is stats from my server
> with GPS connected using FT232H chip (supporting high speed transfers on
> USB). Yes, the jitter is far greater than on other computer where PPS is
> connected
On Montag, 6. Juli 2020 18:04:33 CEST Keith E. Brandt, WD9GET wrote:
> Why isn't the kerninfo showing any info on the pps frequency, stability,
> and jitter?
Kernel support for PPS and for in-kernel PLL utilizing one PPS input are two
different things, at least in the Linux kernel. You are
