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Re: 3.22 not sending PPS to SHM
From: |
Gary E. Miller |
Subject: |
Re: 3.22 not sending PPS to SHM |
Date: |
Fri, 15 Jan 2021 10:39:50 -0800 |
Yo David!
On Fri, 15 Jan 2021 07:57:48 +0000
David Taylor <gm8arv@yahoo.co.uk> wrote:
> In this configuration, the PPS is coming over the GPIO, and is
> independent of the serial connection. Here, ntpd type 22 driver does
> not need a serial connection.
I write the howto, I'm aware of that.
But you fail to note that the type 22 does not use KPPS, so you have
a noticable increase in jitter.
> On most of my systems I'm using that configuration, with multiple
> local stratum-1 and pool internet sources. The PPS is a nice add-on
> for much better time-keeping, but it's not essential. In practice
> there have been no problems - except once when a GPS-jammer equipped
> vehicle drove past!
In addition to the loss of accuracy, there will be instances of
seconds jumping.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588
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- Re: 3.22 not sending PPS to SHM, (continued)
- Re: 3.22 not sending PPS to SHM, Gary E. Miller, 2021/01/12
- Re: 3.22 not sending PPS to SHM, David Taylor, 2021/01/13
- Re: 3.22 not sending PPS to SHM, Gary E. Miller, 2021/01/13
- Re: 3.22 not sending PPS to SHM, David Taylor, 2021/01/14
- Re: 3.22 not sending PPS to SHM, Gary E. Miller, 2021/01/14
- Re: 3.22 not sending PPS to SHM, David Taylor, 2021/01/15
- Re: 3.22 not sending PPS to SHM,
Gary E. Miller <=
- Re: 3.22 not sending PPS to SHM, David Taylor, 2021/01/16
- Re: 3.22 not sending PPS to SHM, Gary E. Miller, 2021/01/16