I'd agree that the shows are very basic, but if it was full of stuff
equivalent to time-nuts level in any of the topics he covers, very few
would be able to understand it and might not watch it. It is a lot like
the old Connections series. I've found both interesting.
In the case of the time epo
Hello,
just wanted to know if there is any very cheap pre programmed pic or
something similar to get frequency of a Yaesu FT-102 radio.
I need it to know its frequency, either the VFO alone (sub 6MHz) or
possibly its real rx and tx frequency (up to 30MHz).
Using the VFO would be easier but then
I really don't disagree with you. I did say run the supply at 28.0 and use a
diode off the supply to the battery. That would place the float voltage at
27.3 or so. Best would be to follow the manufacturers float service
recommendations. Ideally it should also be temperature compensated with
a -
use nickel-iron battery [Edison Accumulator] which is not sensitive to
deep discharge, over charge and last for min twenty years -
unfortunately it does not fit into the American business model --because
it last to long--so it is not produced in the US any more.
73
Alex
On 10/25/2014 5:30 PM, B
Bob,
On 10/25/2014 11:45 PM, Bob Camp wrote:
Hi
On Oct 25, 2014, at 4:08 PM, Magnus Danielson
wrote:
Bob,
On 10/25/2014 08:54 PM, Bob Camp wrote:
Hi
Error bars works a little differently, as they indicate with some probability
(say 1-sigma) within which range the real value is.
By th
Hi
Assuming the supplies are rated for a (fairy normal) 32V max, there is plenty
of room to get everything arranged right. You *might* need to dig up a supply
that is 28V nominal versus 24V nominal. The 10 or 15% adjust range likely will
not quite get the 24V unit up where you would want it to
It's a series. The first night there were two shows back-to-back and I
think the 2nd one was the time-related one.
Its vaguely like the old "Connections" PBS series where; this thing
lead to that thing, which led to...
I was multitasking so might not be the best critic, but I found it very
gr
Hi
> On Oct 25, 2014, at 4:08 PM, Magnus Danielson
> wrote:
>
> Bob,
>
> On 10/25/2014 08:54 PM, Bob Camp wrote:
>> Hi
>>
>>> On Oct 25, 2014, at 2:18 PM, Magnus Danielson
>>> wrote:
>>>
>>>
>>>
>>> On 10/25/2014 07:06 PM, Tom Van Baak wrote:
> In the case of the TimePod, the data ca
Might want to dial that back a bit.
Since 12V/7ah batteries are mentioned I am assuming standard small
gelcell units.
Proper float voltage for a deep cycle is lower than a SLI type, and
gellcell even lower.
Generally 13.6 - 13.8 would be the gellcell range, with 13.6 being right
on for long lif
Well, there is no mention of precision or time measurement. Seems like a
simple, harmless presentation to me. I will admit that from "time to time"
my wife does object to some of his work! We do watch "Frontline" and are
grateful for many of the topics they cover.
Lee A. Mushel
- Orig
I just heard about this book on NPR.
On 10/25/2014 12:51 PM, Brooke Clarke wrote:
Hi:
I don't have TV and wonder if anyone who has PBS can comment on this
program?
preview at:
https://www.youtube.com/watch?v=RhDvGhFbpq8
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time-nuts mailing list
Hi:
I don't have TV and wonder if anyone who has PBS can comment on this program?
preview at:
https://www.youtube.com/watch?v=RhDvGhFbpq8
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
___
Hi
The gotcha may be that they only slip time under unusual conditions. Warmup /
settling in could be one such condition. It may take some detailed looking to
spot it.
Bob
> On Oct 25, 2014, at 3:45 PM, Bob Stewart wrote:
>
> Hi Bob,
>
> The antenna is actually outside. It's mounted to th
Bob,
On 10/25/2014 08:54 PM, Bob Camp wrote:
Hi
On Oct 25, 2014, at 2:18 PM, Magnus Danielson
wrote:
On 10/25/2014 07:06 PM, Tom Van Baak wrote:
In the case of the TimePod, the data can be presented when you have *very* few
samples to work with.
That said, it is interesting to watch it
Hi
> On Oct 25, 2014, at 3:34 PM, Tom Van Baak wrote:
>
>> How many hours / days/ months / years had the OCXO been off power before the
>> run was started?
>>
>> How soon after turn on did you start taking data?
>
> Hi Bob,
>
> On the ocxo.dat data set, the frequency drift rate was down to
Hi
> On Oct 25, 2014, at 4:04 PM, Magnus Danielson
> wrote:
>
> Bob,
>
> On 10/25/2014 08:15 PM, Bob Camp wrote:
>> Hi
>>> On Oct 25, 2014, at 12:19 PM, Magnus Danielson
>>> wrote:
>>>
>>> Bob,
>>>
>>> On 10/25/2014 02:02 PM, Bob Camp wrote:
> On Oct 24, 2014, at 6:25 PM, Magnus
Mostly we don't even write the guts of those algorithms. For example,
you'd use a PID library. One line to create a PID controller object
then one line to call the PID for each phase measurement.
This goes double for, say, drawing a graph of the phase over time to
an LCD display, you'd use a gr
Bob,
On 10/25/2014 08:15 PM, Bob Camp wrote:
Hi
On Oct 25, 2014, at 12:19 PM, Magnus Danielson
wrote:
Bob,
On 10/25/2014 02:02 PM, Bob Camp wrote:
On Oct 24, 2014, at 6:25 PM, Magnus Danielson
wrote:
Tom,
On 10/24/2014 11:31 PM, Tom Van Baak wrote:
ADEV most certainly does change wi
Hi Bob,
The antenna is actually outside. It's mounted to the eave just below the roof
line. It seems to be a better antenna than the one in the attic. It's the
best I can do at the moment.
I'll have to do a comparison of the PPS from this and the PPS from my LEA-6T.
I think they're reportin
These units are ideal for powering via a float charged lead acid battery.
Use two 12 volt / 7 AH batteries in series and adjust the regulated float
power supply to 28.0 volts. Be sure to use a diode from the supply to the
battery just in case the supply can't be back fed during a power fail.
T
> How many hours / days/ months / years had the OCXO been off power before the
> run was started?
>
> How soon after turn on did you start taking data?
Hi Bob,
On the ocxo.dat data set, the frequency drift rate was down to just 5e-11 a day
so it's likely the OCXO had been powered for many days,
Sebastion,
Try swapping the lamps and see if the loosing lock problem follows the
lamp!
Corby
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and follow the instructions the
Hi Bob,
I was just going to say it would be cool if Lady Heather eventually would work.
You read my mind. I can hope!!
73,
Bill, WA2DVU
Cape May
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Saturday, October 25, 2014 12:12 PM
T
Hi
> On Oct 25, 2014, at 2:18 PM, Magnus Danielson
> wrote:
>
>
>
> On 10/25/2014 07:06 PM, Tom Van Baak wrote:
>>> In the case of the TimePod, the data can be presented when you have *very*
>>> few samples to work with.
>>> That said, it is interesting to watch it bring up error bars (which
b...@evoria.net said:
> I'm pretty sure it does provide +5 to the antenna. I didn't understand what
> I was seeing for quite some time yesterday, and it seemed like it was
> telling me it didn't see an antenna. ...
No, it's telling you that your antenna is not in a good location.
When the sate
Hi
We are not talking about a system (like GPS) that has junk data coming in. In
this case, the phase detector gives you a very good estimate of the delta
between input and output in real time. The error trapping / shifting / multi
this and that simply isn’t needed in this case. The solution is
Hi
Spend the effort, get an antenna outside the house. Beg / borrow / steal a UPS.
Even a brand new one is less than you paid for the 3812.
The PPS output on these is not typically designed as a “smoothed’ time
reference. The HP / Symmetricom design philosophy seems to have been that
dropping
Hi Bob,
The thing is: I don't really need a frequency standard other than as a
reference for my GPSDO project. I'll have to look into pulling out that
message every second to see if the correction makes it a suitable phase
reference. No, the nanosecond level probably isn't suitable for your ne
Hi
How many hours / days/ months / years had the OCXO been off power before the
run was started?
How soon after turn on did you start taking data?
Bob
> On Oct 25, 2014, at 12:35 PM, Tom Van Baak wrote:
>
> Let's take a real example.
>
> Use your own phase data, or grab any of my large data
Hi
Remember - these gizmos are designed as a CDMA base station reference, not as a
Time Nut frequency (or time) standard. They (likely) had a +/- 100 ns spec on
the gizmo for static time error when locked to GPS. The little trained squirrel
inside makes an executive decision to move the PPS whe
Hi
> On Oct 25, 2014, at 12:19 PM, Magnus Danielson
> wrote:
>
> Bob,
>
> On 10/25/2014 02:02 PM, Bob Camp wrote:
>>
>>> On Oct 24, 2014, at 6:25 PM, Magnus Danielson
>>> wrote:
>>>
>>> Tom,
>>>
>>> On 10/24/2014 11:31 PM, Tom Van Baak wrote:
>> ADEV most certainly does change with tim
On 10/25/2014 07:06 PM, Tom Van Baak wrote:
In the case of the TimePod, the data can be presented when you have *very* few
samples to work with.
That said, it is interesting to watch it bring up error bars (which are indeed
correctly calculated)
and then see the trace walk outside those error
Hi
If you plot the data versus the six sigma bars (should have been more precise),
you will see it walk outside them as well.
Bob
> On Oct 25, 2014, at 1:06 PM, Tom Van Baak wrote:
>
>> In the case of the TimePod, the data can be presented when you have *very*
>> few samples to work with.
>>
Bob wrote:
PHK has a roughly 6 line code snippet that does a basic PLL. Add two
more lines to check / clamp the integrator if you wish. That's 8
lines. If you want a D term (to give it an FLL component) add 2 more
lines. We're up to 10 lines.
It's just a control loop, not a full GPSDO. There
I can't remember when I initially powered up my RFTG-u REF 1 how long
it took to give me the green light but I *believe* it was a long time,
maybe the better part of 24 hours. I think after testing and being
fustrated I forgot to turn it off one night and the next day things
looked normal. I have s
Thanks, Corby!
Followed your advice, and made a 15x2mm screwdriver by grinding down a
carbon steel scraper. A combination of 10min heating on the physical
package, plus the tool and got the rubidium bulb out.
I've had these oscillators running since 8:00 in the morning, doing a
simple XY signal tra
> In the case of the TimePod, the data can be presented when you have *very*
> few samples to work with.
> That said, it is interesting to watch it bring up error bars (which are
> indeed correctly calculated)
> and then see the trace walk outside those error bars as the run progresses.
> There a
Bob,
On 10/25/2014 02:02 PM, Bob Camp wrote:
On Oct 24, 2014, at 6:25 PM, Magnus Danielson
wrote:
Tom,
On 10/24/2014 11:31 PM, Tom Van Baak wrote:
ADEV most certainly does change with time, even for short tau's.
Can you elaborate?
Such as when, why, what kind of change, how much change,
Hi Bob,
So, to use this as a phase reference for testing my unit, I'd have to get the
phase error out each second and correct for that? Or is it a matter of the
OCXO getting happy over the next few weeks and it will settle down? In my
mind's eye, I see its DAC moving on a slope just like mine
Hi
> On Oct 25, 2014, at 3:39 AM, Poul-Henning Kamp wrote:
>
>
> In message <544ad1d1.4040...@rubidium.dyndns.org>, Magnus Danielson writes:
>
>> A great way to illustrate the point of degrees of freedom and the number
>> of sample-points needed to get tight confidence intervals is to
Hi
If the Z3810/11/12 is like the other HP / Symmetricom boxes (and I’d bet it is):
1) It will go into survey and sync relatively slowly compared to some of the
other units.
2) It’s got a less sensitive / lower channel count receiver than stuff like
Said’s new part.
3) It will take a *long*
Regarding my comment earlier that my GPSDO and this Z3812A don't agree on
phase. I see just now a fairly quick phase movement of the phase between the
two, and I see that there is a line on the Satstat program that may explain
this: 1PPS TI +50.0 ns relative to GPS. Just a few minutes ago, it
Hi Bob,
During the first hour it reported poor geometry a number of times. Then it
seemed to get its act together and was solidly into survey mode. A few hours
later and it was satisfied with life and went into hold mode, with TFOM=3,
FFOM=0.
This morning, I see that there is some phase tracki
Hi Anthony,
I'm pretty sure it does provide +5 to the antenna. I didn't understand what I
was seeing for quite some time yesterday, and it seemed like it was telling me
it didn't see an antenna. So, I pulled it off of the splitter and put it onto
my second antenna. After a bit, it saw some sa
Hi
In fact, even without any “weird” stuff in the data, you can see short tau ADEV
drop as an OCXO runs for days / weeks / months. You can test this by taking
your 15 to 30 minute test run and breaking it into three or four sub runs.
Bob
> On Oct 25, 2014, at 7:04 AM, WarrenS via time-nuts wr
Some of the reasons that ADEV values change over time may be
caused by one of these two things that I have seen cause poor plots.
Either of which can cause changes in the ADEV values across
a wide range of taus, and the effect can change over long run ins.
Hopefully Magnus will comment if ADEV i
> On Oct 24, 2014, at 6:25 PM, Magnus Danielson
> wrote:
>
> Tom,
>
> On 10/24/2014 11:31 PM, Tom Van Baak wrote:
ADEV most certainly does change with time, even for short tau's.
>>>
>>> Can you elaborate?
>>> Such as when, why, what kind of change, how much change,
>>> at how short of t
In message <544ad1d1.4040...@rubidium.dyndns.org>, Magnus Danielson writes:
>A great way to illustrate the point of degrees of freedom and the number
>of sample-points needed to get tight confidence intervals is to see how
>the high-tau end of a curve updates in TimeLab and behaves as t
Hi
One of the interesting things about these little receiver modules is that they
don’t all report the same survey location. There are NIST papers with examples.
You could probably spend a lot of time on the “why”.
If you are getting “poor geometry” errors, either you have an antenna issue, or
Hi Bob
If REF-0 is the only one that can output the data that would certainly put
me in a shot myself in the foot position wouldn't it?:-)
However, we do know from Arthur that REF-1 will operate stand alone, so
assuming you haven't got a faulty unit, which I suspect is pretty unlikely,
an
Let us know how this is progressing. I am waiting on a TNC connector, so can't
get mine up and running this weekend as planned. I'll get my power supply
sorted out and see if I can get SatStat connected.
Do you know if the GPS input provides a 5v bias to drive an antenna?
Anthony
-Origina
b...@evoria.net said:
> The mode says "Power-Up: GPS Acquisition", so I guess that's OK. I think
> things are progressing. It's attempting to survey, but reporting
> "Suspended: poor geometry". I suppose with a little more time this will
> work itself out? It seems to be slowly tracking more s
(I do not understand why Yahoo responds to the list for some of you and for
others it responds only to the sender. This is a resend to the list.)
Hi Hal,
That should have been Satstat, and yeah, after looking through the Z3801 User's
Guide, I decided to just let it play by itself. It found the
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