Gerhard
See:
http://www.sdrforum.org/pages/sdr06/sdr06_papers/1.3/1.3-01.pdf
for an ultra low phase noise dds technique.
Bruce
Gerhard Hoffmann wrote:
Am 06.01.2011 20:02, schrieb Tijd Dingen:
Also note the glaring lack of a prescaler. This can and will be added
at a later date to extend the
List,
I apologize in advance for my long posting
Several weeks ago I posted what were my attempts to save data and my school-of
hard-knocks learning curve. Unfortunately several posters just had to nit-pick
the process I had used and started a long series of posts and counter-posts
about the
Seems to me there's at least three things going on.
1. People need meaningful work. It is more satisfying to re-invent
from ignorance than to learn that something has been done several
times before. Either way, the effect on the orbits of stars is
not measurable. It only matters to a human.
2.
I'm designing a simulator for LORAN-A... YES, LORAN-A. It needs about 24
different GRIs from roughly 50,000 uS to 30,000 uS. Rounded to integers,
the GRIs come out to something like 49,407 uS.
Does anybody have any simple ideas for generating such a signal. For
simplicity, I'd like to use a
For prescaling, I'd suggest using the dividers in one of the Analog Devices
PLL parts (ADF4xxx) instead of Hittite chips. Many of the AD parts can
still be purchased in packages with actual pins, and you can always get them
in small quantities. They will also take a lot less power.
Then I
Hi John:
There are a number of options. A couple that come to mind are:
(1) us a Stanford Research DG535, see:
http://www.prc68.com/I/TandFTE.shtml#DG535
(2) use a PIC or other micro controller.
http://www.prc68.com/I/PIC16F88.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
J. Forster
Loran A wow. That is indeed ancient. Did you find a old receiver or what
that you are tinkering with?
Regards
Paul
On Fri, Jan 7, 2011 at 5:28 PM, J. Forster j...@quik.com wrote:
I just got to thinking a few minutes ago a Tektronix DD501 or a BNC
digital delay would be just about perfectly
Indeed would be very interested in the schematic of the synth.
Regards
Paul.
On Thu, Jan 6, 2011 at 3:49 PM, ewkeh...@aol.com wrote:
Arthur,
you mention that the 204 can select 60 KHz by thumbwheel. Do you have a
schematic of that synthesizer? I know they had a 60 KHz down converter I
have
Battleship Massachusetts has one, right near you.
-John
=
Loran A wow. That is indeed ancient. Did you find a old receiver or what
that you are tinkering with?
Regards
Paul
On Fri, Jan 7, 2011 at 5:28 PM, J. Forster j...@quik.com wrote:
I just got to thinking a few minutes
--- On Thu, 1/6/11, Magnus Danielson mag...@rubidium.dyndns.org wrote:
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] No State Of The Art Counter
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: Thursday, January 6, 2011, 10:05
I know it reasonably well. Though I don't think I ever saw that. But its a
heck of a ship.
Are you trying to hot it back up?
On Fri, Jan 7, 2011 at 5:37 PM, J. Forster j...@quik.com wrote:
Battleship Massachusetts has one, right near you.
-John
=
Loran A wow. That is indeed
For prescaling, I'd suggest using the dividers in one of the Analog
Devices
PLL parts (ADF4xxx) instead of Hittite chips. Many of the AD parts can
still be purchased in packages with actual pins, and you can always get
them
in small quantities. They will also take a lot less power.
It's in the Chart Room. The ship is always looking for technical help, BTW.
Yes,
-John
===
I know it reasonably well. Though I don't think I ever saw that. But its a
heck of a ship.
Are you trying to hot it back up?
On Fri, Jan 7, 2011 at 5:37 PM, J. Forster j...@quik.com
For prescaling, I'd suggest using the dividers in one of the Analog
Devices
PLL parts (ADF4xxx) instead of Hittite chips. Many of the AD parts can
still be purchased in packages with actual pins, and you can always get
them
in small quantities. They will also take a lot less power.
Brooke,
I disagree. Hard drive sizes have done nothing but soar over the last
30 years. So, even if you have to replace them every 10 years, you
only have to buy 1/10th the number of drives every decade.
This is exactly my data retention strategy. Every time I get a new
computer, I copy my
List,
Several members have mentioned that they have HP 10811 style oscillators. A
very neat packaging solution with dividers and circuits is posted at: KH6GRT.
Do a Google search.
Regards,
Perrier
___
time-nuts mailing list --
And for those of us that really hate being teased into doing a google search
when it's just as easy to paste the link, here's the link:
http://www.qsl.net/kh6grt/page4/freqstd/freqstd.htm
Here's the main page where the above frequency standard is listed:
Has anyone experimented with the amount of insulation on a
10544 or 10811 oscillator? They are meant to run hot by
design and I worry that adding any insulation, or too much
insulation, will either cause over-heating or limit the ability
of the oven control to maintain the set point.
None of the
On 08/01/11 02:22, Tom Van Baak wrote:
Has anyone experimented with the amount of insulation on a
10544 or 10811 oscillator? They are meant to run hot by
design and I worry that adding any insulation, or too much
insulation, will either cause over-heating or limit the ability
of the oven control
On 07/01/11 23:45, Tijd Dingen wrote:
--- On Thu, 1/6/11, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
From: Magnus Danielsonmag...@rubidium.dyndns.org
Subject: Re: [time-nuts] No State Of The Art Counter
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Date:
I'm looking at building a LORAN-A simulator to run a vintage display.
I used to design stuff with gates and counters by hand, and can still do
so, but it's tedious.
Does anyboby know of any freeware that can be used to draw up logic and
simulate its operation, including propagation delays? I
I also had a similar find on eBay. I snagged a Tektronix PG 508 pulse
generator that I got for about the same price as shipping (approx $50)
because the 'Control Error' light was on. Sure enough, the close-up
pictures were good enough to show that the risetime/falltime etc.
settings were
On 1/7/2011 5:22 PM, Tom Van Baak wrote:
Has anyone experimented with the amount of insulation on a
10544 or 10811 oscillator? They are meant to run hot by
design and I worry that adding any insulation, or too much
insulation, will either cause over-heating or limit the ability
of the oven
You are 100% correct that no digital media is archival and all of it
will fail or there will be no machine that can read it. Certainly
everything we have will be junk in 100 years. But digital data is
not the same as digital media. Data can be perfectly copied. We can
make many copies. For
There is an old saying:
If you give a man a fish, he won't be hungry for one day.
If you teach a man to fish, he won't be hungry for life.
Yes, it is just as easy to post the link, but then what
does he learn? He learns to rely on others to do his
work for him.
Everyone needs to learn how to
On 08/01/11 03:28, J. Forster wrote:
I'm looking at building a LORAN-A simulator to run a vintage display.
Hmm. Generating blips programmed in repetition rate and delay as steps
of a 10 MHz clock should be sufficient and fairly straight forward. A
lower clock such as 1 MHz would probably
John I did the Loran C simulator. But it acted as a single station and its
only goal was to allow austrons and such to do phase comparison of
oscillators. Took only a few chips simple and small.
I was at the tail end of loran A in the navy. Really do not remember
anything about the theory any
Magnus,
See my post of a few minutes ago.
The GRI and Delay counters need to be 5 decimal digits. My current
thinking is manual entry of the numbers via BCD coded thumbwheel switches.
LORAN-A has 24 possible GRIs; in three blocks of 33 PPS; 25 PPS; and 20
PPS. It also has 4 RF frequencies.
Paul,
How did you do the GRI counter? I'd like to use an N8290A chip as a
programmable decade counter, but they are obsolete.
Best,
-John
===
John I did the Loran C simulator. But it acted as a single station and its
only goal was to allow austrons and such to do phase
Well, Perry, you were right. The thread has drifted into technology
when the real challenge is the catalog for all that has gone before.
But perhaps that is not within this group's charter.
History Channel did a reasonable presentation of the Knights Templar,
within their tabloid guidelines,
John,
On 08/01/11 05:04, J. Forster wrote:
Magnus,
See my post of a few minutes ago.
The GRI and Delay counters need to be 5 decimal digits. My current
thinking is manual entry of the numbers via BCD coded thumbwheel switches.
If you only need a static location that will be fine. Naturally
On 08/01/11 06:54, Magnus Danielson wrote:
John,
On 08/01/11 05:04, J. Forster wrote:
Magnus,
See my post of a few minutes ago.
The GRI and Delay counters need to be 5 decimal digits. My current
thinking is manual entry of the numbers via BCD coded thumbwheel
switches.
If you only need a
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