On Wed, Mar 10, 2021 at 2:21 PM Bruce Griffiths
wrote:
>
> Unless something akin to VLBI or pulsar timing is involved millisecond
> accuracy will usually suffice for amateur astronomy.
I think some of the most demanding requirements for optical astronomy
by amateur/semi-pros are set by observing
On Fri, Mar 20, 2020 at 9:59 AM Perry Sandeen via time-nuts
wrote:
>
> Gents,
> This is the only one I've ever seen on ebay in 15+ years. Sold as parts only
> but it has a clean 5Mhz output. No bids so far at $499. Auction ends Sat
> 1:52 PDST. (I'd buy it if my discretionary financial situat
On Fri, Nov 22, 2019 at 9:01 AM Bob kb8tq wrote:
>
> Hi
>
> At least right now, it is the “king of the hill” in terms of low cost modules
> that
> will do L1 / L2.
>
> If the target application is precision survey work, you do want (at least)
> dual
> band reception. All of the post processing o
On Thu, Aug 8, 2019 at 8:07 AM Adam Kumiszcza wrote:
>
> Hi everybody! My first post here, I hope the subject is adequate for this
> mailing list.
>
> I'm using a tiny layer 1 NTP server consisting of Raspberry Pi 3B+ with
> Ublox MAX-M8Q expansion board providing GNSS (currently GPS, Galileo and
On Sat, Mar 30, 2019 at 9:01 AM jimlux wrote:
>
> On 3/27/19 11:49 AM, coderman via time-nuts wrote:
>
> Compiled the software, but...
>
> > he user specifies the GPS satellite constellation through a GPS broadcast
> > ephemeris file. The daily GPS broadcast ephemeris file (brdc) is a merge of
>
On Mon, Mar 18, 2019 at 8:03 AM Rodger via time-nuts
wrote:
>
> Tom,
>
> Thanks for the explanation of clock ensembles. That answered a few
> questions I've had for a while.
> Regarding your comments on collecting raw time data from GPS and post
> processing it. Can you provide any reference inf
On Tue, Mar 12, 2019 at 4:01 PM Steve Olney wrote:
>
> Hi Bob,
>
> On 13/03/2019 1:30 am, Bob kb8tq wrote:
> > Sorry if this is an ongoing / somewhat random dump of a bunch of things … I
> > am not doing the
> > same sort of thing you are doing. That makes a lot of this a bit less
> > focused th
On Mon, Mar 11, 2019 at 4:04 PM Bob kb8tq wrote:
>
> Hi
>
> A “proper” timing device with antenna is a sub $100 sort of thing. It will be
> < 100 ns pretty much forever and ever.
"Proper" for pulsar radio astronomers, at least professional ones,
tends to be a hydrogen maser(s)...
>
> Bob
>
> >
On Tue, Jan 22, 2019 at 12:02 AM Mark Sims wrote:
>
> That looks like the antenna that I am currently using. The were mentioned
> on the list last year, but the cheap ones quickly disappeared and the price
> went to $250-$300. The seem to work very well. I get 6-10 mm error
> ellipses usin
On Wed, Jan 16, 2019 at 2:00 PM Jim Palfreyman wrote:
>
> For the record, when using R, the package "lubridate" (which is part of the
> brilliant "tidyverse") does handle leap seconds.
astropy's time object in Python
(http://docs.astropy.org/en/stable/time/index.html) can also handle
leap seconds
On Fri, Jul 13, 2018 at 11:46 PM, Anders Wallin
wrote:
> Is PPP-AR "ambiguity resolution" the same (or similar) as iPPP from CNES
> (code or service not publicly available AFAIK)?
> iPPP time/frequency transfer is a useful improvement over PPP, see e.g.
> http://cnfgg.eu/pdf/G2_2015/Gerard%20PETIT
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