Thank you to all.
I will check these items and report back to the group what I found.
The antenna is up in the clear and I am feeding it with somewhere in the range
of 60-75 feet of RG 6 quad shield.
Chris
—
Sent from Mailbox
On Thu, Aug 6, 2015 at 12:21 PM, Chris Albertson
No, but Lady Heather will do that.
Regards,
David Partridge
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Waldrup
Sent: 06 August 2015 12:59
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] A few questions
In the world of time nuts, little things matter. Nanoseconds are an
eternity. We rip our hair out (if we have any left) over 1E-11 errors,
weep over phase noise and shriek about Allen deviations, modified or
otherwise.
The question is: just where are the little things?
If you are new at this,
Luciano,
I have found that selected 10811 units will offer significantly better
short term stability as a stand alone or open loop oscillator over the
105 style oscillator. (Mid parts in 10-13th from 1 to 100 Seconds)
However with the 5065A locked the performance will be driven by the loop
and
On 8/5/15 8:27 PM, Donald wrote:
On 8/5/2015 7:55 PM, Bob Camp wrote:
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering
approach
that creates issues. Some of the early 192 KHz audio parts did not do
My favorite WWVB clock is the Junghans Mega Atomic Alarm Clock. I
have several of them and they work almost anywhere (in the USA). The
manual says to change the battery once every 30 days. Just for fun I
wanted to see how long they could go without having to change the AA
battery - two of
On 8/5/15 8:03 PM, Donald wrote:
On 8/5/2015 6:44 PM, Jim Lux wrote:
I'm not sure it would buy you much.. you'd have something running at
240kHz switching the inputs to the detector?
It's MUCH easier to just digitize the 60kHz with a high resolution
converter. And have a nice BPF in front of
On 8/5/2015 7:55 PM, Bob Camp wrote:
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering approach
that creates issues. Some of the early 192 KHz audio parts did not do very well
past 1/4 the clock rate.
Did you do 48 hour precision first survey first to get an accurate Lat/Long/
altitude?. You will probably need to start with a cold reset to erase any
previously stored data and then perform the survey.
-=Bryan=-
Date: Wed, 5 Aug 2015 19:16:23 -0700
From: kd4...@gmail.com
To:
kb...@n1k.org said:
You *might* even be able to dispense with the tear down of the KS box and
feed it 1 pps out of your ADC / FPGA / MCU / Bailing wire rig. Instant WWVB
disciplined OCXO.
Has anybody investigated the signals on the cable between the two boxes?
The status screen on the
On 8/5/2015 6:44 PM, Jim Lux wrote:
I'm not sure it would buy you much.. you'd have something running at
240kHz switching the inputs to the detector?
It's MUCH easier to just digitize the 60kHz with a high resolution
converter. And have a nice BPF in front of the digitizer.
The
Picking up a strong signal here in North Carolina. My 2100F has been locked to
Wildwood all morning. I'm using a 5' wire whip and a home brew preamp.
Not hearing Dana yet.
Dan
On Aug 4, 2015, at 2:34 PM, paul swed paulsw...@gmail.com wrote:
The Wildwood, NJ Transmitter will be on air from
Chris:
If you did a cold reset I *think* it should have already done that, you would
have known because it would have said conducting survey or something like that
as opposed to Overdetermined clock. To be safe and force it,use the following
keystrokes in LH
S and then P
-=Bryan=-
Hi
HP 10811’s vary over almost a 100:1 range in terms of ADEV performance at short
tau. The standard model is un-sealed so it has some issues
with humidity when it is in storage for a long time. In both the case of the
10811 and the 105, their stability will improve as they are
on power. In
Hi
Well, at least *some* of the chips out there do not make it to 96 KHz when
sampling at 192 KHz. It’s
been a few years since I dug into them. Back then a chip that had an internal
filter that went to 96K
was very much the exception rather than the rule. If the only point of 192K is
getting
Hi
The gotcha with under sampling is the need for tight bandpass filters in front
of the sampler. Narrow bandwidth always
equates to long delay. If the filters are analog (rather than digital) that
delay will have drift and temperature sensitivity.
Both of those things are to be avoided (if
Hi
On Aug 6, 2015, at 1:43 PM, Jim Lux jim...@earthlink.net wrote:
On 8/5/15 8:27 PM, Donald wrote:
On 8/5/2015 7:55 PM, Bob Camp wrote:
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering
not on that I can see
On Thu, Aug 6, 2015 at 12:46 PM, D W watsondani...@gmail.com wrote:
Picking up a strong signal here in North Carolina. My 2100F has been
locked to Wildwood all morning. I'm using a 5' wire whip and a home brew
preamp.
Not hearing Dana yet.
Dan
On Aug 4, 2015, at
On 8/5/2015 12:43 AM, Donald wrote:
/Does anyone have a schematic for building a simple WWVB receiver ?/
You might give a look at this :
http://armradio.weaksignals.com
The board itself costs less than 25 USD. The other components just a few $$.
Of course you need to know how to solder...
Clint,
Is this the design you are looking for?
http://webpages.charter.net/ekyle/WWVB.html
-Neil
On Thu, Aug 6, 2015 at 12:04 PM, Clint Turner tur...@ussc.com wrote:
Years ago I ran across a project in which the WWVB signal, after being
siphoned from a cheap TRF clock module with a Hi-Z
Hello Fellows!
Had anyone managed to run the KS-24361 REF-0, the one without GPS, as a
standalone unit? If so, can you provide some links on how to configure it?
The reason to try this is cost. The REF-0 unit costs USD 25 + USD 52.30
(shipping to Brazil) and I have to pay the same amount as
Burt,
according the manual for this clock,
the typical operating time for one 1.5V AA battery is 3 years!
(but may last longer with good battery quality!)
link for the manual:
http://www.junghanswatchesusa.net/assets/images/manuals/alarm.pdf
Unfortunately I cannot find the equivalent for DCF
I am locked at 8970 GRI, have been for a few hours
No luck with 9960 GRI from this location.
Using a SRS FS700
Stan, W1LECape CodFN41sr
On 8/6/2015 4:10 PM, paul swed wrote:
not on that I can see
On Thu, Aug 6, 2015 at 12:46 PM, D W watsondani...@gmail.com wrote:
Picking up a
Years ago I ran across a project in which the WWVB signal, after being
siphoned from a cheap TRF clock module with a Hi-Z follower, IIRC, was
shoved directly into the A/D input (10 bits) of a rather low-end PIC
running at a fairly low sample rate - something in the 4-8 kHz range.
IIRC, from
I have found this old posting from 2014:
https://www.febo.com/pipermail/time-nuts/2014-August/086043.html
Ivan Cousins states:
A WWVB receiver can now be done on an Arduino microprocessor with a
little help from an antenna.
Googleing has not found such an article or project.
Has this ever
As long as there is no analog audio bandwidth Nyquist filter, or it is
digital and scales with the sampling frequency, then I agree.
--- Graham
==
On Thu, Aug 6, 2015 at 5:24 AM, David G. McGaw david.g.mc...@dartmouth.edu
wrote:
That is not true. If the converter is set to 192kHz sampling,
james.fl...@csun.edu said:
carbon composition 5% -550 ppm/deg C
cheap 5 % metal film -240 ppm/deg C
1% metal film axial lead -1 ppm/deg C
1% thick film surface mount -1 ppm/deg C
...
Also the carbon composition resistor drifted with time at elevated
temperature.
That is not true. If the converter is set to 192kHz sampling, the
bandwidth will be nearly 96kHz, typically at least 80kHz, not limited to
20kHz. That is the POINT of 192kHz sampling.
David N1HAC
On 8/5/15 10:03 PM, Graham / KE9H wrote:
Scott:
You won't be able to use an off-the-shelf
The GPS satellites are not geosynchronous; they move with an orbital period
of 12 hours, so their position in the sky is constantly changing. However,
they return to the same position in the sky (modulo repositioning) twice
per day.
It sounds like your Thunderbolt has a saved location that
Hi
On Aug 5, 2015, at 11:27 PM, Donald donvuko...@gmail.com wrote:
On 8/5/2015 7:55 PM, Bob Camp wrote:
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering
approach
that creates issues. Some
On Wed, Aug 5, 2015 at 7:16 PM, Chris Waldrup kd4...@gmail.com wrote:
Hi,
But when I unplugged the AC power from the Thunderbolt and plugged it
back in, I was back to six satellites.
I had thought that the GPS satellites I am able to see from my location
are fixed 24/7. Do they move and
Hi Bryan,
I didn't do that. Is this something accessible under one of the tabs?
Chris
—
Sent from Mailbox
On Thu, Aug 6, 2015 at 5:21 AM, Bryan _ bpl...@outlook.com wrote:
Did you do 48 hour precision first survey first to get an accurate Lat/Long/
altitude?. You will probably need
Hi
On Aug 5, 2015, at 10:16 PM, Chris Waldrup kd4...@gmail.com wrote:
Hi,
I got my new Thunderbolt up and running this past weekend but I have a few
questions. I understand Lady Heather is a better program, and I have
downloaded it. However right now I am trying to get things right
33 matches
Mail list logo
