I happen to have a less than ideal ham shack/lab and antenna setup.
The shack/lab is second floor in the rear.
The main antenna is an inverted L 30ft straight back from the shack.
There are about 50 pounds of type 31 ferrite in the house suppressing
_everything_ to the point that I cannot
Has anybody tried using the AD5791 20bit DAC for EFC control ?
--
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.
As one of our digital loop projects we took a very, very close look at it,
but thought once you consider the application, requirements of external
references, its influence on temperature performance and cost, a dithered 20
bit LTC 1655 held at 0.1 C is as good a solution. Have not actually
On Fri, Apr 19, 2013 at 09:20:05AM -0400, ewkeh...@aol.com wrote:
As one of our digital loop projects we took a very, very close
look at it, but thought once you consider the application,
requirements of external references, its influence on
temperature performance and cost, a
The other day I got sidetracked and managed to build another Soekris Net4501
with an Oncore UT+ I had laying around. My old CF
images from ~2008 have always served me well, but the problem being they
require a 256MB or greater CF card. Seeing as how I had a
stack of old 64MB 128MB cards lying
Jason, a few months ago I was able to build a FreeBSD 9 system using
standard NTP. It involved a lot of pain, a lot of help from PHK, and a
lot of handwaving, but in the end it worked. I'm happy to share config
info if you'd like -- contact me off list.
John
On 4/19/2013 9:50 AM,
Moin Rick,
On Wed, 17 Apr 2013 10:20:09 -0700
Rick Karlquist rich...@karlquist.com wrote:
Volker Esper wrote:
I have been looking into low jitter triggers for sampling systems
recently and will probably end up using a discrete differential
amplifier driving ECL logic.
Why discrete?
On Wed, 17 Apr 2013 20:16:24 -0700
Jim Lux jim...@earthlink.net wrote:
There's a very nice picture of a pinwheel from Novatel on the back cover
of the March issue of GPS world..
Has anyone a digital (or scanned) copy of that picture?
It's kind of difficult (i.e. impossible) to get GPS world
In message 20130419134411.gb29...@mail.13thfloor.at, Herbert Poetzl writes:
On Fri, Apr 19, 2013 at 09:20:05AM -0400, ewkeh...@aol.com wrote:
Texas Instruments has a number of precision DACs for a
very reasonable price, for example the DAC1220 (20bit
low power delta-sigma, ~8 USD) and precision
On 4/19/13 7:30 AM, Attila Kinali wrote:
On Wed, 17 Apr 2013 20:16:24 -0700
Jim Lux jim...@earthlink.net wrote:
There's a very nice picture of a pinwheel from Novatel on the back cover
of the March issue of GPS world..
Has anyone a digital (or scanned) copy of that picture?
It's kind of
On Thu, 18 Apr 2013 13:38:50 -0700
Hal Murray hmur...@megapathdsl.net wrote:
What's the adev of pulsars at long times? How long is long? Where is the
knee of the curve?
I remember reading something about 10^-18 long term (iirc 1year), but
cannot find where i read it.
But to acheive that
Thats a great question and not to distract the thread. The modern
references seem far superior to the old ones that might be as simple as a
zener diode. However the internal references are almost always in a semi
temperature controlled environment near the oven.
Kind of interesting trade offs.
Dumb question time ...
I use T-Bolt Mon to see how my T-Bolt is working. From a cold start, what
do I look for to indicate the output is locked to GPS ?
73, Dick, W1KSZ
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Hi Jim,
On 04/19/2013 04:47 PM, Jim Lux wrote:
On 4/19/13 7:30 AM, Attila Kinali wrote:
On Wed, 17 Apr 2013 20:16:24 -0700
Jim Lux jim...@earthlink.net wrote:
There's a very nice picture of a pinwheel from Novatel on the back cover
of the March issue of GPS world..
Has anyone a digital (or
Hi,
As some of you may know, the Boston Marathon bombers killed an MIT Police
Officer about 100 yards from the site of the Sunday MIT Flea Market. MIT
is now shut down, for today at least.
One of the suspects is dead. Another is at large in Watertown close by.
The whole area is on 'lock-down'
Hi Hal,
Why are X-Ray pulsars better than radio pulsars for navigation?
My impression is that it's easier to manage all-sky coverage at x-ray with
a small spacecraft package (I think millisecond pulsars generally emit at
both microwave and x-ray). Also there's some interstellar
On 4/19/13 11:47 AM, Peter Monta wrote:
Hi Hal,
Why are X-Ray pulsars better than radio pulsars for navigation?
My impression is that it's easier to manage all-sky coverage at x-ray with
a small spacecraft package (I think millisecond pulsars generally emit at
both microwave and x-ray).
On 07/04/13 21:55, WB6BNQ wrote:
Hi Alec,
I am going to agree with Robert (G8RPI) on his assessment, particularly as the
dip switches are clearly visible in one of the pictures. Although I wonder why
Robert feels unfortunate about the [ two chip DDS arrangement ] ?
It matters not the number
Hi All,
To recap, I'm trying to determine how best to get a good shop timing
reference from a TBOLT (good new-style XO, LH as 2nd oven), HP 58503A
and Symmetricom 58503B. Here we are 6 months later, and after swapping
oscillators, updating antennas and GPS distribution amps, I've
Success! I've managed to set mine to 10MHz. I've documented this on my
blog:
http://blog.m0tei.co.uk/post/2013/04/20/Mystery-Aircraft-Parts-and-Atomic-Clocks
Thanks to those who offered suggestions.
Regards
Alec
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time-nuts mailing list --
Hi Skip,
You might have seen my reference to the small board in the 'variation 2'
FE-5680. I looked at the signal on the orange lead and found only about
2.02 Vdc. The orange lead goes to the output of a D-A converter on the
small board. So, on a hunch, I used a 10-turn pot to put 0-5V
Alexander Wright wrote:
On 07/04/13 21:55, WB6BNQ wrote:
Hi Alec,
I am going to agree with Robert (G8RPI) on his assessment, particularly as
the dip switches are clearly visible in one of the pictures. Although I
wonder why Robert feels unfortunate about the [ two chip DDS
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