I have not followed this closely. Why not use the data itself? The
theoretical pattern for the telescope pair can be calculated. Even
though the signals are not i.i.d, from phototubes, the data can be slid
along and the delay pattern established and compared to the theoretical
pattern? Timing
Well done!
Don
On 03/21/2014 03:55 PM, Tom Van Baak wrote:
Designing a GPSDO is a permanent topic of time-nuts, and always invites lots of
opinions and methods.
The net performance of a microcontroller-based GPSDO is mostly due to the
following ingredients:
- the stability of the OCXO (or TCX
granite is not only radioactive, but also piezoelectric.
Dpn
On 03/29/2014 12:48 PM, Magnus Danielson wrote:
On 28/03/14 04:47, Mark Sims wrote:
no, No, NO granite! Granite tends to be rather radioactive
(particularly avoid the pink stuff). Any audiofool worth his tin
ears can't have no sti
I like the little boards at:
http://navspark.mybigcommerce.com/development-boards/
It's a GPS with a fully programmable 32-bit Arduino-compatible
processor. $22
Crowdsourced about 3 yr ago, matured now. Various versions; you can even
have Beidou :-).
Don
On 2016-05-22 19:45, Tom Van Baak wrot
This might be a good job for the Red Pitaya q.v.
Don
On 2016-05-27 18:17, Bruce Griffiths wrote:
On Thursday, May 26, 2016 06:40:26 PM Bob Camp wrote:
Hi
Very interesting paper, thanks for sharing !!
One question:
In many DMTD (and single mixer) systems, a lowpass and high pass
filter are
excellent vid, Bryan!
On 2016-06-25 03:48, Bryan _ wrote:
Quartz Crystal motional movement...
https://youtu.be/y-rCgumTn4Q
-=Bryan=-
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h
re,I'm only 2
mi of good road off I90. Contact me off list at djl ampersand montana
dot com. There is more stuff here as well. Big sale.
Thanks for your patience.
Don
--
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
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time-
That's easy, Magnus. Do not use a Fluke counter :-)
Don
On 2016-10-09 13:02, KA2WEU--- via time-nuts wrote:
You guys never give up, happy Sunday
In a message dated 10/9/2016 2:46:02 P.M. Eastern Daylight Time,
mag...@rubidium.se writes:
Hi,
Agree. However, one need to make sure that the coun
Hi Bob et al:
I have 4 of these, got some time ago. Here is the data from the ROM's:
s/nRom no
2510A04059 hp1818-2295A 2335
2136A03167 hp1818-2295A 0844 this one white ceramic with lotsa
gold; the eldest.
2702A04579$M$hp1818-2295A 2912 this one costcutting. b
Looks promising, but with no data sheets and no purchase source or
pricing, just more vaporware...
Don
On 2016-10-10 20:02, Nick Sayer via time-nuts wrote:
The video linked on that page is particularly interesting (if you take
it on face value that they're not faking it. ;) ).
Sent from my iPh
But how the heck did they get some? According to the website, even data
sheets are not available.
Don
On 2016-10-10 21:32, Henry Hallam wrote:
I can attest that that oscillator was a lifesaver recently in a
project I was tangentially involved with. They had tried several
TCXOs and were plagued
Echo, Magnus. Thanks, Skip! Easy now to see the incredible expense of
building one of these! Kinda Kludgy; Love the s/s spot welded keepers on
the screw heads, e.g.
My really dumb question is, why isn't there Cs plated on everything? Or
is the Cs contained in the rf cavity only? I think I see a
Just homemade opto-isolators. Used in choppers, too. The transistor was
indeed bonded to the heatsink. Just replace the whole thing with a
3-legged regulator? or simply a modern PNP t0-220 with a little heat
sink on it.
73, Don
On 2016-11-06 15:15, paul swed wrote:
Don't know what to say on
Interesting, Tom. I don't think I see any of those pesky grain boundary
shifts or readjustments in the lattice structure? If I remember, these
can cause instant shifts in frequency that do not heal?
Don
On 2016-11-12 14:54, Tom Van Baak wrote:
There were postings recently about OCXO ageing, o
You have it right, Bob. fitting is essentially a narrow band filter
process. Fitting thus has essentially the same errors.
Don
On 2017-11-22 09:19, Bob kb8tq wrote:
Hi
The “risk” with any fitting process is that it can act as a filter.
Fitting a single
sine wave “edge” to find a zero is not g
Forgot to add I think this can be proved mathematically. It's been a
long time
Don
On 2017-11-22 12:52, djl wrote:
You have it right, Bob. fitting is essentially a narrow band filter
process. Fitting thus has essentially the same errors.
Don
On 2017-11-22 09:19, Bob kb8tq wrote:
Hi
True that the models depend on the noise statistics to be iid, that is
ergodic. That's the first assumption, and, while making the math
tractable, is the worst assumption.
Don
On 2017-11-28 01:52, Mattia Rizzi wrote:
Hi
This is true. But then the Fourier transformation integrates time from
pbs video player sucks big ones...
On 2018-01-16 18:47, Joseph Gray wrote:
If you want to watch this episode online, go here:
http://video.unctv.org/video/3008204310
This is the UNC Public TV web site.
Joe Gray
W5JG
On Tue, Jan 16, 2018 at 2:28 PM, Bill Tracey wrote:
To record OTA televi
There's a picture of the guts in the ebay description...it's a dual
patch antenna!
the patches seem to be trimmed to get a pattern.
On 2018-02-05 20:33, John Green wrote:
https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageName=STRK%3
start with the power supplies, and go on until morning...
Don
On 2018-02-19 16:57, walter shawlee 2 wrote:
I recently got a strange little 1U FEI rack mounted unit called an
FE-7923F-100-1,
which appears to have rear 10MHz and dual 100Mhz outputs. it is called
a Frequency Reference Unit.
sadly,
Chinese made, ... This
part looks almost identical to the Trimble Microcentered antenna I
worked
on recently.
Right. It's Chinese made. 'nuff said.
Don
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Fine. The Chinese have no concept of, or ignore, intellectual property
rights. They will cheerfully use 13 year old girls to put together stuff
using counterfeit parts and ripped circuits. There is little or no
quality control. The problem is that these goods drive better goods out
of the marke
Pete: I need a handwarmer. We're having a colder than usual winter.
Don
On 2018-02-28 12:45, Pete Lancashire wrote:
If anyone wants it, he or she that comes up with the coolest reason can
have it. It rattles so I will take a look inside and post what I find
-pete
On Feb 28, 2018 10:54 AM, "Jo
-part-day-atmegas-with-programmable-logic/#respond
[15]
http://hackaday.com/2018/03/02/new-part-day-atmegas-with-programmable-logic/#comments
[16]
https://subscribe.wordpress.com/?key=d109931f8119f9f47c8f2ccdf1639bbf&email=djl%40montana.com&b=Cu-jouj-AjzbRThX%5DBcP%26S2OFnwRx%26-7%5De3CdvW9
Tom: I sense a nice experiment! Dry ice temps can be attained with
modest Dewars and thermoelectric fridge devices. PID controller and
bob's your uncle. Type K thermocouple modules on epay. With that
apparat, a nice set of adev vs temperature possible? Dry ice/acetone or
ethyl alcohol (eve
Nice, Jim!!!
On 2018-04-13 01:54, Tom Van Baak wrote:
Amazing news... 1.2.3.
1) Many of you know that pulsars are weird astronomical sources of
periodic signals. Some are so accurate that they rival atomic clocks
for stability! True, but I don't have a 100 foot antenna at home so
I'll take thei
Interesting indeed! Seems as if there ought to be info about drawing
crystals mono vs poly isotopic somewhere out there. Also some info about
crystal grain boundaries that might be generated in a zone furnace
drawing by isotope inclusions. Seems the boundaries are responsible for
the sudden fr
Darn. maybe not grain boundaries, but dislocations? or both?
Don
On 2018-04-22 10:19, Poul-Henning Kamp wrote:
Silicon comes in a number of isotopes but 95% of it is Silicon-28.
When you make pure mono-crystaline silicon, you get 50-60% better
thermal conductivity if you only use Silicon-28 ato
Hi Doug
I'm visiting just down the coast and could pick up the HP. If not sold
I'll take it.
Don AJ7LL
On 2018-05-18 22:04, Doug Millar via time-nuts wrote:
Hi, I am willing to part with my HP 5061A cesium standard and manual.
The unit was rebuilt and functioning some years ago and not used s
Hi Doug. Did not see my email go by. Would like to have the cs standard.
I'm visiting my family in Huntington Beach and can pick it up so no
packing. Have cash.
Off list at djl at Montana dot com
Thanks Don AJ7LL
On 2018-05-18 22:04, Doug Millar via time-nuts wrote:
Hi, I am willing to
bought any prescription drugs lately?
On 2017-01-20 09:58, Bob Camp wrote:
Hi
I completely agree that their spin at acquisition and the reality of
what just came out
is completely amazing. They said they would never do this and that.
What they are doing
is exactly what they said they would not
The BC-221 was the backbone of WW2 communications. How else were all
those sloppy BC-348's and AR-13's set to the called-for frequencies?
Same for shipboard.
Don
On 2017-02-13 13:05, Brooke Clarke wrote:
Hi Bob:
The BC-221 is usually referred to as either a Frequency Meter or a
Heterodyne F
Hi: Ran across this recently, for those looking for odd stable
frequencies.
http://www.qrp-labs.com/ocxokit
I haven't built one of these, but for $16 plus shipping, hey.
It does use a single-loop oven, built in.
I've had conversation with QRP labs, and found them knowledgeable and
congenial.
Toy
Can't find this on Tindie???
On 2017-05-10 09:03, Mark Sims wrote:
The GPS with the lowest PPS jitter/sawtooth is the Venus timing
receiver... around 6 ns. Nick Sayer sells one on Tindie for $50. It
is mounted on a board that has the same pinouts as the Adafruit
Ultimate GPS. Also Navspark s
But what if Tal Avda is in Arizona
On 2017-05-21 14:50, Gregory Maxwell wrote:
Found on the web:
http://slatestarcodex.com/2013/11/03/the-witching-hour/
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Yep, GR once made the best. The GR connector had at least three things
going; as noted hermaphroditic. No need for several sexes. Second, they
are seamless 50 ohms, very very small reflections at the connection.
Third, banana plugs (also a GR idea, I think) fit in the center "post"
of the conne
I'd really like to have a look at the schematic, but trying to read it
leads to some app requiring me to bare my machine's soul to an unknown
app developer. Could plain .pdf be put somewhere not involving Google?
Thanks
don
On 2017-06-26 14:17, William H. Fite wrote:
On Monday, June 26, 2017,
d'oh never mind
don
On 2017-06-26 14:43, djl wrote:
I'd really like to have a look at the schematic, but trying to read it
leads to some app requiring me to bare my machine's soul to an unknown
app developer. Could plain .pdf be put somewhere not involving
Google?
Thanks
don
O
Thanks! for the nice reply. I did as you suggested and got a copy!
Don
On 2017-06-26 15:43, Jan-Derk Bakker wrote:
On Mon, Jun 26, 2017 at 10:43 PM, djl wrote:
I'd really like to have a look at the schematic, but trying to read it
leads to some app requiring me to bare my machine'
Could it be that someone thought adhesive would be less prone to
cracking from stress than solder?
Also, do you think that the adhesive could be cleaned one end at a time
and replaced with solder?
I'm admittedly too lazy to look/try just now.
Don
On 2017-07-19 07:09, Gary Neilson wrote:
This
Good even for mild steel too. Best is your good advice to use the drill
press to keep the tap aligned. softer aluminum alloys are very "sticky"
and demand backing off a turn for almost every turn forward for cutting
taps to break the chip. I've found that the 6/32 tap is the most easily
broken
Would a step recovery diode be better?
for example
http://www.mwrf.com/analog-semiconductors/designing-step-recovery-diode-based-comb-generator
Don
On 2017-10-28 12:20, jimlux wrote:
On 10/28/17 10:34 AM, John Ackermann N8UR wrote:
Jim, I thought about using an RF-input sync pulse for alignmen
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