[time-nuts] Re: Sparkfun lists SA.35m

[David Witten]

It seems to be aspirational.
It has been on the SparkX page for a long time now.

Dave


> Date: Sat, 03 Apr 2021 07:15:13 +
> From: "Poul-Henning Kamp" 
> Subject: [time-nuts] Sparkfun lists SA.35m
> To: Discussion of precise time and frequency measurement
> 
> Message-ID: <81790.1617434...@critter.freebsd.dk>
> Content-Type: text/plain; charset="us-ascii"
>
> I know it's not a particular outstanding atomic clock, but I was still
> surprised to see that Sparkfun lists the SA.35m for $1995...
>
> https://www.sparkfun.com/products/14830
>
> Not in stock though...
>
> --
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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Re: [time-nuts] Galileo service currently degraded

[David Witten]

Kevin,

I am very interested in your GNSS monitoring website. I would consider
building a system similar to yours, perhaps using dual frequency
receivers.  I am not exactly in 'another part of the world' (though it
often seems another planet) in central Missouri at 38.947232, -92.303583.
I would like to know more about your setup.

Dave
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[time-nuts] uBLOX ZED-F0P Arduino library

[David Witten]

A note for anyone who has worked the SparkFun Ublox Arduino Library  and
RTK -
Nathan Seidle wrote this morning:

I found a handful of issues and am getting RTCM output now:
> ...
> Should be fixed in the latest version of lib. Please install >v1.4.0.
> Please open new issue if you still have a problem.


I.e. - the RTK/RTCM3 examples did not work as advertised.

Dave, KD0EAG
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[time-nuts] GN-GGB0710 GPS Antenna Mounting Thread

[David Witten]

The bit of threaded tubing I found at the hardware store that fits
perfectly is labeled:

ProLine plumbing and heating products
BN-750NLB
877250
Nipple
(Niple)
1/4 inch x 1/4 inch x 6 inch
MIP
for installation instructions visit:
www.bkproducts.com

I was surprised by the 1/4 inch bit, as it seems distinctly larger.  It is
definitely tapered and threads smoothly, and seats firmly with all of the
threads engaged.

Dave
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[time-nuts] GN-GGB0710 GPS Antenna Mounting Thread

[David Witten]

FWIW

I just poked around my shop and found something that fit perfectly.  It was
a 5/8 inch plumbing 'barb'.  So I just went to to a big-box  hardware store
(Lowes) and went to the plumbing section.  The sales person agreed with me
that it seemed to be tapered and I found a nice 8 inch length of brass
extension threaded on both ends.  It fit snugly and seems well suited for
attachment to a larger pole using a couple of hose clamps.

Dave Witten
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Re: [time-nuts] Ublox F9P multi-band GPS receiver

[David Witten]

A competitor to the Tallysman antennas is Taoglas:

https://www.taoglas.com/product-category/gps-glonass-gnss/l1-l2-l5-antennas/

 3.0 v, $77.47 direct
https://cdn.taoglas.com/datasheets/AQHA.50.A.30.pdf

Dave
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[time-nuts] Fw: Helium and MEMS oscillators don;t mix well

[David Witten]

Ok, one last try:

>From AuntMinnie.com, free but subscrip[tion-based newslettter for clinical
radiologists and related staff:


November 1, 2018 -- A second imaging facility is reporting problems with
Apple devices that appear to be related to the operation of the center's
MRI scanner. Nearly 10 late-model Apple iPhones and Watches were
permanently disabled at a Delaware center after it ramped down its MRI
magnet.

CNMRI is an imaging facility in Dover, DE, that specializes in neurology
and sleep medicine. It operates a 1.5-tesla MRI magnet and also performs
studies such as polysomnography, nerve conduction, and home sleep studies,
according to Dr. Robert Varipapa, a neurologist at the center.

In mid-October, field service engineers from an imaging OEM arrived and
ramped the magnet down and then back up again. Immediately thereafter,
staff members at the center who owned Apple devices with wireless charging
reported that their devices were disabled. Approximately eight or nine
devices were affected, according to Varipapa.

Only newer-model Apple products such as the iPhone 8 and iPhone 10 were
affected, he added. Those with older models didn't experience any problems,
nor did staff with Android phones.

The Delaware center's experience is similar to that of an Illinois hospital
that also reported conflict
s
between its MRI scanner and iPhones. That site reported that nearly 40
iPhones stopped working after the installation of a new MRI scanner. The
problem was attributed to helium gas that may have leaked during the
installation and found its way into the mechanical workings of the phones.

But there are also crucial differences between the Illinois incident and
the experience at the Delaware center. For one thing, the Delaware site
never experienced a helium leak, to Varipapa's knowledge. Also, while the
Illinois site reported problems with Apple models at the iPhone 6 level and
above, in Delaware the problem was restricted to newer models with wireless
charging -- no iPhone 6 devices were affected, Varipapa told AuntMinnie.com.

Finally, at the Illinois hospital, some of the iPhones began working again
after the helium inside the devices apparently dissipated. At CNMRI, all of
the smartphones were permanently disabled, and staff had to get new ones.

Varipapa said CNMRI's physicist told him that the center's experience is
not an uncommon one. The physicist has heard that some field service
engineers tell staff members to place smartphones in their cars' glove
boxes when MRI magnets are being serviced, he said.
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Re: [time-nuts] Helium and MEMS oscillators don;t mix well

[David Witten]

Please pardon my usual incompetence posting to mailing lists...

2nd MRI center reports problems with Apple devices


Aunt Minnie is a newsletter/site targeting clinical radiologists and
technical staff.

Dave
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[time-nuts] Fwd: Delivery Status Notification (Failure)

[David Witten]

2nd MRI center reports problems with Apple devices


Aunt Minnie is a newsletter/site targeting clinical radiologists and
technical staff.

Dave
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