Hi Hugh,
Enjoying your stories.
On 2019-01-21 01:57, Rice, Hugh (IPH Writing Systems) wrote:
Like all breakthrough measurements, the next 20+ years was spent refining the concept.
Better "front end" amplifiers, able to measure low amplitude signals. Faster
counters, that could capture
On 1/21/19 9:18 AM, jimlux wrote:
egregious error cauhgt
Here in Southern California, it was about 9PM local, so we were farther
away from the moon than folks on the US East Coast watching at local
midnight. Why that's almost 2000km - 6 microseconds.
6 milliseconds..
Been seriously enjoying the discussion. Especially the insights of HP. I
have several 5245 and 5248Ms (Better oven osc)
Just had to do a few minor repairs over Christmas. That said the binary
counter to nixie decoders are just a crazy engineering marvel. Neon bulbs
light that change a photo cell
Hi
At least at this point things like sawtooth correction outputs are still a “who
knows if there is one”
kind of thing. Doing a GPSDO and not having sawtooth corrected out is sort of a
letdown ….
Stuff gets better from L1 / L2, but then gets worse when you put hanging
bridges back in ….
Keep
in high school, i had a summer job at the NYU EE dept up in the Bronx
campus (where my dad taught english!)
this was the summer of 1956 and 57. in the lab equipment issuing room
there lived a 524 with the vertical neon lites.
along with a plethora of other now ancient equipment.
long ago in a
Hi Rick,
On 2019-01-21 16:31, Richard (Rick) Karlquist wrote:
I designed a state machine running on a 32 MHz clock
to resync 4 MHz clock edges. A number of engineers
know just enough to be dangerous and suggested the
technique is to just make a shift register and run
the incoming edge through
Hopefully Jackson Labs (If possible) will offer an update of their M12M
replacement that I believe currently uses M8T. I have been preparing for this
inevitable evolution for a while updating all my antenna system with all band
GNSS antennas, distribution amps, as well as fiber links I use to
Hi
Here’s an ad for a somewhat different antenna with some barely readable
bandwidth testing data:
Hi
My first though was that something like this:
https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?hash=item3b16dc0eec:g:p8sAAOSwu7hbNoe0:rk:1:pf:0
Per the integration guide
(https://www.u-blox.com/sites/default/files/ZED-F9P_IntegrationManual_%28UBX-18010802%29.pdf),
the recommended antenna should be between 30dB and 40dB of gain.
Additional note: ublox is releasing an eval board (p/n C099-F9P) which
is similar to the sparkfun board,
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1951-01.pdf
On Mon, 2019-01-21 at 14:15 -0500, Gordon Batey wrote:
> Greetings to all,
>
> I believe that was the HP 525 counter. I had one as my first
> counter
> which I picked up surplus many years ago. It had several plug-ins
> for
> different
I was spoiled...
I spent 3 years in Ethiopia, '65 - '68, with the ArmySecurity Agency. Our shop
looked like a TEK andHP Catalog!! Our FREQ REF rack was the GSQ-53A,dual
Sulzer 5MHz ovenized oscillators which we phase compared against GBR on 16KHz.
We ran the phase chart 24/7 to make sure we
Hi all,
That would be a 524B counter, all 90 tubes (depending on the plugin) and 600
watts of it. I still have one in going condition but it's not to be used in
the Australian summer with 42C forecast for later this week.
The ovenised 100 KHz vacuum mounted crystal in it still performs pretty
Hi
Taking a quick look at what’s in view right now, the GPS L2C population is
about half of the total.
The L5 population is about half of the L2C group. No idea if that is true of
the entire fleet.
Also no idea if my snow covered antennas are throwing things off a bit.
All of the Glonass
Is it not the case that atmospheric effects end up shifting the time of
observation by several seconds depending on location and condition?
I was going to write, "We should be weary of specifying precision we do not
have," but rather it maybe better to write, "Perhaps we should be explicit
If you scroll down to the bottom of the product pages for the zed-f9x
modules, you'll see the 'ANN-MB', a L1/L2/E5b antenna that ublox is
presumably making to go with the ZED-F9. It's still marked 'preorder'
Cheers
Michael
On Tue, 22 Jan 2019 at 6:00 am, Bob kb8tq wrote:
> Hi
>
> To be more
Like these?
http://www.tallysman.com/index.php/gnss/products/antennas-triple-band/
On 21/01/2019 12:33 PM, Bob kb8tq wrote:
Hi
To be more precise, what you want is a L1/L2/L5 triple band antenna.
Bob
On Jan 21, 2019, at 11:32 AM, Bob kb8tq wrote:
Hi
Based on the F9P data sheet, you will
Greetings to all,
I believe that was the HP 525 counter. I had one as my first counter
which I picked up surplus many years ago. It had several plug-ins for
different
frequency ranges. Kept the basement warm in the winter time. The vhf
plugin was a heterodyne mixer as I recall. This unit
Hi Brooke,
SV position in circular orbit repeats at 12h sidereal, but ground relative
az/el repeats at 24h sidereal. This is because of the earth 24h rotation rate.
After 12h your earth position will be 180deg away from (inertil) start position.
—
Björn
Sent from my iPhone
> On 21 Jan
Hi
Just purchased one of the 100 bux 10 MHz/1pps GPS units. Seems to fire up
and lock ok, but wondering if anyone else has experience with these rascals.
Bought mine from an Amazon source. I've got it hooked up to my HP Hi Rez
counter (can't recall the model number) Have not had time
On 1/21/19 5:50 AM, Magnus Danielson wrote:
Hi,
On 2019-01-21 08:07, Mark Sims wrote:
While on the subject of the accuracy/reliability of various algorithms
and web pages showing various astronomical data, we had a full moon /
total lunar eclipse in the northern hemisphere. And not just any
Indeed. Getting a *quality* antenna with that coverage will likely be a more
costly affair than getting the actual receiver..
Of course, a cheap puck-style antenna is an option, but I am curious as to what
improvements will actually be observed, at least for the time being - IIRC only
about
Hi
To be more precise, what you want is a L1/L2/L5 triple band antenna.
Bob
> On Jan 21, 2019, at 11:32 AM, Bob kb8tq wrote:
>
> Hi
>
> Based on the F9P data sheet, you will need an L1 / L2 antenna that is wide
> enough
> to get the Galileo E5B as well as the Glonass L1OF and L2OF bands.
Hi
Based on the F9P data sheet, you will need an L1 / L2 antenna that is wide
enough
to get the Galileo E5B as well as the Glonass L1OF and L2OF bands. The gotcha
is that (so far) I have not found a gain number for the target antenna. As we
have
found on other modules, you do want to get the
Circa 1982:
After the cancellation of the HP 10816 mini rubidium
product, I worked on the 5183 "Waveform Recorder"
(the name was a euphemism to deflect charter wars
with the scope division which was just getting into
digital scopes). I was tasked with designing a DRAM
memory board, to replace
What kind of antenna is needed to simultaneously hear all of the systems at
once?
My PCTel GPS antenna has a filter that limits it to only the US GPS system.
--- Graham
==
On Mon, Jan 21, 2019 at 4:01 AM Dustin Marquess wrote:
> If DigiKey's pricing is accurate, the ZED-F9T is $13.89 more
Hi,
On 2019-01-21 08:07, Mark Sims wrote:
While on the subject of the accuracy/reliability of various algorithms and web
pages showing various astronomical data, we had a full moon / total lunar
eclipse in the northern hemisphere. And not just any full moon, but a Super
Blood Werewolf
Hi
Ok, so the “product summary” page on DigiKey very clearly shows the
frequency coverage information. If that data sheet was on SparkFun ….
I must have gone right past it.
The equivalent F9T sheet starts out right at the top talking about correcting
ionosphere delay to deliver better timing.
Hi,
I used an HP counter in 1961 that had these vertical strings of
neon tubes behind numbers, and the two least significant decimals were read off
two milliamp meters numbered 0 to 10. For each count the needles would point to
the
number to be read. The whole instrument was a 2 foot cube that
Mr. Eclipse, hosted by Fred Espenak, is your go-to page for this. The data for
both solar and lunar eclipse events seems to be accurate based on my experience
of past events.
http://www.eclipsewise.com/lunar/LEprime/2001-2100/LE2019Jan21Tprime.html
Mark Sims wrote:
> While on the
According to my copy of Guide9 (Pluto project) full moon occurred at 21 Jan
05:16:04 UTC.
On Mon, 21 Jan 2019 07:07:31 +, Mark Sims wrote:
>While on the subject of the accuracy/reliability of various algorithms and web
>pages showing various astronomical data, we had a full moon /
total
If DigiKey's pricing is accurate, the ZED-F9T is $13.89 more than a
ZED-F9P. I would have gladly paid $14 more for a version of the
SparkFun board using the T(iming) version instead :(.
On Mon, Jan 21, 2019 at 12:10 AM Bob kb8tq wrote:
>
> Hi
>
> From a *very* quick read of the doc’s:
>
> 1)
I also expected that, but when I added the ability of Lady Heather to plot the
SNR/az/el/carrier phase/pseudorange of a given satellite, I found that they
repeat every 24-ish hours. At 12-ish hours the SNR and time the receiver had
usable signal was greatly reduced.
>The
https://www.arl.wustl.edu/~jst/cse/260/glitchChaney.pdf
suggests metastability was noticed in the 1940's but not taken seriously for
decades thereafter.
Bruce
> On 21 January 2019 at 19:10 Hal Murray wrote:
>
>
>
> When did people designing counter/timers start paying attention to
>
> It is clearly multi-band for GPS. It is unclear from a quick read if it is
> multi-band for the other systems.
Here's what they say it supports:
184-channel u-blox F9 engine
GPS L1C/A L2C,
GLO L1OF L2OF,
GAL E1B/C E5b,
BDS B1I B2I,
QZSS L1C/A L2C
Here's the link to the Sparkfun device.
35 matches
Mail list logo
