On 4/17/2018 5:12 PM, donandarl...@gmail.com wrote:
I’m looking for the Hex files for the Pack Rat GPS receiver project.
If any body has them, I sure would appreciate a copy.
I found an old post on here that showed Ben Hall had the code and would share
it with others off line
But I have no way
on my RPi running Lady Heather, but without
the TruePosition hooked up yet:
<http://www.kd5byb.net/TruePosition/LHVNC.JPG>
thanks much and 73,
ben, kd5byb
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XTSTATUS message, it doesn't display it anywhere. I need to create
a fourth display page with DOP on it or fit it in elsewhere.
And that's about it. Suggestions to the code are welcome.
thanks much and 73,
ben, kd5byb
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On 6/17/2017 8:53 AM, Ben Hall wrote:
I've been toying with the idea of modifying one of the units to add
internal DC-blocking and resistors to ground for DC-load. For DC block,
seems like I could very carefully slice the trace on the board by the
SMA connector, bridging the gap with an SMA
26 dB-ish. I
don't know what sort of dynamic range these GPS receivers have, so that
might not been needed.
thanks much and 73,
ben, kd5byb
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something that's halfway decent...I'll put it out for people to give it
a whirl and tell me how crappy my programming skills are! ;)
thanks much,
ben
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got the button logic working,
I'll send out my source to anyone who wants to take a look at it or use
it. I will stipulate one condition - you can't make too much fun of how
poorly programmed it is. ;)
thanks much and 73,
ben, kd5byb
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...and
the NIST page even suggests that delay over a cell phone line is variable.
Then I've got to add code to look at a button to switch display screens,
code up those screens, then figure out how to deal with survey mode.
thanks much and 73,
ben, kd5byb
Uno to do this.
I'm sure there is a way to do this with an interrupt...but I couldn't
make that work yesterday. More to follow.
thanks much and 73,
ben, kd5byb
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uch and 73,
ben, kd5byb
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lunch. :(
thanks much,
ben
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s...but I've got to think
about that as I'm not sure how integer math on the Arduino treats a
decimal remainder.
Of course...all this is moot if I can get what I want out of the time
library. :)
thanks much,
ben
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than NMEA, but the ability to
convert GPS seconds into date/time is very interesting and I will look
into this more. :)
thanks much,
ben
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te
and time...then I'll move along to the display and a rudimentary menu
system as I think one part will be time/date/status...and another page
will be GPS satellites...
thanks much and 73,
ben, kd5byb
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To uns
On 5/9/2017 7:03 PM, Ben Hall wrote:
My little TTL-to-serial adapter is wired RX to pin 7, ground to pin 5,
TX to pin 3.
CORRECTION: that should be:
My little TTL-to-USB adapter is wired RX to pin 7, ground to pin 5, TX
to pin 3.
Sorry / thanks,
ben
Evening all,
Got brave and decided to experiment...and answered my own question below...
On 5/9/2017 6:02 PM, Ben Hall wrote:
Does this mean that pins 7 and 8 are a TTL serial RX/TX pair that
function the same as J2...but without going thru the Sipex TTL-to-RS232
converter? That would
ry it.
Time to find that disposable laptop I've got somewhere around here...
The LMU300 can BSOD that thing all it wants! ;)
thanks much,
ben
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them off-list.
thanks,
ben
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n go
back from RS232 with the Sipex chip on the board.
Have taken a look-see on pins 3 and 4 to see if there is any serial data
coming in / going out of there?
thanks much,
ben
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o TTL-level serial. I almost did that the
other day in my excitement to get it up and working.
Personally, I wouldn't use the mini-grabbers...but that's just me...
thanks,
ben
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Heather yet but plan to do that soon. Is the
version hosted here <http://www.ke5fx.com/heather/readme.htm> have the
TruePosition code in it?
thanks much,
ben
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face? I'm curious if you
issues something like a "help" command...will the unit tell you what its
command set might be? That would be nice. I've had ZERO luck finding
any information either on the TruePosition unit or the Furuno GPS used.
thanks much
...
So far, I have had no luck finding any info on these devices.
Me neither. I started trying to find if there was a programming
reference for the Furuno GPS board it uses...and also failed there too. :(
Oh well...
thanks much,
ben
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the authors of the Packrat GPS Receiver Project slides
asking about getting my hands on the Arduino code and asking if they
happened to have a copy of the full programming reference. :)
I'll share what I learn with the group. :)
thanks much and 73,
ben, kd5byb
The team I work with was forced to outsource the NTP service to a telco
(the largest in the Netherlands). Too bad they didn't handle the leap
second well.
Some time after the leap second hundreds of servers and VM's reported
NTP problems.
...
sys.peer - stratum 15, last reached 28 secs ago,
I saw it too, here in UTC+1 it went to 01:00:60. But the logging was correct.
23:59:59 167.06974e-09 0.0180810.611410
36.720154 5
23:59:60 176.99192e-09 -0.008905 0.611410
36.720184 5
00:00:00 186.85744e-09
mand I believe?
I've never been able to figure out the self-test error. It keeps
working...so I keep using it... ;)
14 years of power-on time... :)
thanks much and 73,
ben, kd5byb
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at the house for years.
Great signal, even indoors. :)
thanks,
ben
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again,
ben, kd5byb
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as to elaborate how to do this? Been looking for
such a solution off and on for a while...and I'm not having a lot of
luck with Google search at the moment.
thanks much and 73,
ben
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(plus attached if this list doesn't block attachments)
thanks,
ben
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have to ask the question,
your are probably not ready to attempt the task.
I was pretty sure that this was going to be the case, but figured I'd
ask. I was hoping it would be something not technically difficult, just
time consuming. :)
thanks much,
ben
if I've got anywhere near the skills to do it...
thanks much and 73,
ben, kd5byb
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.
Thank you for posting this - my Z3801 now correctly shows a 2015 date:
<http://www.kd5byb.net/kd5bybgpscon/gpsstat.htm>
thanks much and 73,
ben, kd5byb
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will overheat and fry the
electronics as they get far hotter than they ever intended.
thanks much and 73,
ben, kd5byb
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13.5
years, it probably doesn't owe me a thing. :)
thanks much and 73,
ben, kd5byb
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be seen here:
<http://www.kd5byb.net/kd5bybgpscon/gpsstat.htm>
When I command a self test via *TST? command, it returns 0, which is no
error.
Not sure why GPSCON is reporting a self test error. Any advice? It
seems to be functioning normally in all respects. :)
thanks much and 73,
ben,
manageable. Also need to
get Samba working so I can pull the data files off the RPi onto the PC
for manipulation. :)
thanks much and 73,
ben, kd5byb
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At home I recorded the following seconds:
Tunderbolt GPSDO 58 59 60 00 01 02
Meinberg LANTIME M200 58 59 59 00 01 02
hopf DCF 7001 58 59 60 01 02 03
Conrad DCF Time Terminal 58 59 00 01 02 03
The (old 1999) DCF hopf clock in particular was a strange one. It
announced
Thanks for the heads-up. Bought two of them and now have my Z3801
running off of one vice the transformer-based supply I had been using.
thanks much and 73,
ben, kd5byb
On 6/13/2015 8:54 PM, John Allen wrote:
BG Micro has some nice 48V 2A power supply modules for around $12.
IEC power cord
On 3/25/2015 10:50 PM, Dave Martindale wrote:
Perhaps a trip to Connecticut is in order this fall ...
I grew up in CT. Mystic is a very beautiful place and the Seaport
Museum was pretty nice the last time I was there. Wow...that was 20
years ago...how time flies...
thanks and 73,
ben
understand the reason behind the 12ns minimum
measurement time?
Cheers,
- Ben
pgpks0OEnyQ82.pgp
Description: PGP signature
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. I put raw 5 VAC into the
PIC pin via a 10k resistor. That's it. Any conditioning can be done
in software.
It is a lot simpler too. Simple is always good in my book. (mostly
because I'm too stupid to do much that is complex!)
thanks much and 73,
ben, kd5byb
On 3/1/2015 3:10 PM, Ben Hall asked:
Using a zero-crossing detector with the picPET and logging the timing of
each zero-crossing, how do you toss out the other 59 samples each second?
I think I figured out a very obvious way.
~60 Hz AC -- zero crossing detector -- divide by 64 ripple counter
an
Arduino, but nothing (yet) that uses a high-precision reference such as
10 MHz from a GPSDO.
On a side note...the Z3801 got a new outdoor GPS antenna yesterday.
Very happy with how well it is working:
http://www.kd5byb.net/kd5bybgpscon/gpsstat.htm
thanks much and 73,
ben, kd5byb
- pzf : correlation
mbgLtNgRefclockStatusB - all : field strength
Version: LANTIME V6.14.021
Best regards,
Ben
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like the field
strength level. Below are links to my graph and the Kiel VLF monitor
graph.
Field strength and PZF Correlation graph:
http://imgur.com/gdosBhs
Kiel VLF monitor graph:
http://imgur.com/DC9yDrQ
I hope someone has an explanation or suggestion I can learn from :)
Best regards,
Ben
.
-Ben
On Thu, Apr 3, 2014 at 6:24 PM, Michael Perrett mkperr...@gmail.com wrote:
Wow, if 1 second in 300 million years is correct, that's around 1 E-16th.
M
On Thu, Apr 3, 2014 at 2:51 PM, Edesio Costa e Silva
time-n...@tardis.net.br wrote:
Full story at
http
My lab has had good luck with the ADF4350 eval boards as clock generators.
The snippet description on the analog devices website of them is incorrect
though, they can accept a 10 MHz clock ref. The datasheet is definitely
more accurate than the description.
-Ben
On Mon, Dec 30, 2013 at 9:36
difference in taking those measurements. The
averaging time of OLCs is just so much better than the single-ion based
standards (which are still the most accurate standards in the world... At
least for now ).
- Ben
On Aug 23, 2013 7:54 PM, Tom Van Baak (lab) t
source FPGA receivers that might be of use to time nuts.
Cheers,
- Ben
[1]
http://michelebavaro.blogspot.it/2012/04/spring-news-in-gnss-and-sdr-domain.html
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Thank you very much for your response. This is amazingly helpful.
Attila Kinali att...@kinali.ch writes:
On Wed, 21 Mar 2012 12:18:21 -0400
Ben Gamari bgam...@physics.umass.edu wrote:
On Wed, 21 Mar 2012 09:44:14 -0500, David davidwh...@gmail.com wrote:
I am surprised it is not more
Attila Kinali att...@kinali.ch writes:
On Thu, 22 Mar 2012 11:12:40 -0400
Ben Gamari bgam...@physics.umass.edu wrote:
If you are really going to build your own design, then i suggest you
read these papers:
Thank you very much for this list. While I have already stumbled upon a
few
design) but it
seems it will be non-trivial to get down to the 12 ns the commercial
offerings provide (although at great cost). What would a discrete TDC
design look like? Are there any designs in the open?
Cheers,
- Ben
[1] http://www.keteu.org/~haunma/proj/pandadaq/
[2] http://www.ohwr.org/projects
motherboards
can do a/d at 192 but not as well as the Xonar.
Even better: a USB DVB card [1]. For $30 you have a few million 8-bit
I/Q samples per second and an interface to Gnu Radio. The possibilities
are nearly endless.
Cheers,
- Ben
[1] http://sdr.osmocom.org/trac/wiki/rtl-sdr
Bob Camp li...@rtty.us writes:
Hi
Are you after 12 ns or 12 ps?
Bah, yes, my bad: picoseconds is the relevant timescale here.
Cheers,
- Ben
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will be in large
part averaged out.
Cheers,
- Ben
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