It's gone now (checked 10:35 Hrs GMT 01-01-2012) S'pose clocks that used the
code will be discarded or the owners will discover how good or bad the built-in
quartz osc. is.
Happy New Year to all,
John H.
On 1 Jan 2012, at 00:23, Alan Melia wrote:
> Probably when the hung over teckies get bac
At 10:47 01/01/2012, you wrote:
It's gone now (checked 10:35 Hrs GMT 01-01-2012) S'pose clocks that
used the code will be discarded or the owners will discover how good
or bad the built-in quartz osc. is.
Happy New Year to all,
John H.
Never saw a clock controlled by HBG, only by DCF. Must
I too have been mulling over a minimal GPSDO.
Has anyone mentioned a PWM DAC? Even a "toy" microcontroller like the
Atmel AVRs can generate 16 bit resolution PWM, which sounds like it
would be heaps. As long as the voltage reference is low noise, it does
not matter if it drifts slowly, since the c
Yes, the HBG has gone... I wasn't able to record the last transmission. If
I suspected that the shutdown was casual I'd have written an audio time
lapse with amplitude trigger to let my PC record overnight. My
Wandel&Goltermann SPM-3 with the 1500Hz IF output is great at this task,
but I was sleepi
On 01/01/2012 12:23 PM, Tom Harris wrote:
> I too have been mulling over a minimal GPSDO.
>
> Has anyone mentioned a PWM DAC? Even a "toy" microcontroller like the
> Atmel AVRs can generate 16 bit resolution PWM, which sounds like it
..
> So a minimal GPSDO looks like a simple microcontroller (
I did manage to make a recording of HBG's shutdown this morning.
It was at 07:00:13.2 UTC.
Why precisely then, I don't know...
HNY,
Pieter-Tjerk, PA3FWM
On Sun, Jan 01, 2012 at 01:24:09PM +0100, Azelio Boriani wrote:
> Yes, the HBG has gone... I wasn't able to record the last transmission. If
On Sun, 01 Jan 2012 11:23:48 +0100
Marco IK1ODO wrote:
> Never saw a clock controlled by HBG, only by DCF. Must ask some Swiss friend.
I live in switzerland, but have never seen a HBG controlled clock either.
Probably there was only "professional" equipment, but even that i've never
seen.
I know someone who has one, I'll try and get details.
John H.
On 1 Jan 2012, at 15:11, Attila Kinali wrote:
> On Sun, 01 Jan 2012 11:23:48 +0100
> Marco IK1ODO wrote:
>
>> Never saw a clock controlled by HBG, only by DCF. Must ask some Swiss friend.
>
> I live in switzerland, but have never
Marco,
I have had an HBG-controlled clock for some years. Not that it ever received
HBG at this range! The clock is an 'Irox HB13P' projection clock, and has
the logo 'Official Swiss Time' on the front, which you can clearly see at
http://www.irox.com/Web/en/Products/Archive/HB13P.htm.
The us
Hi
Any real world capacitor will have a dielecric with an associated insulation
resistance. It's a "more money gets better performance" sort of thing, but
there are indeed limits. A 1000 uF cap that has a "good" insulation resistance
number might cost you more than some new cars….
No free lunc
What do Swiss parking meters use then ??
Alan
G3NYK
- Original Message -
From: "Attila Kinali"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, January 01, 2012 3:11 PM
Subject: Re: [time-nuts] HBG keeps transmitting...
> On Sun, 01 Jan 2012 11:23:48 +0100
> Ma
Hi
The drums and boxes are sold off to scrap guys in bulk lots. The auction
process is more or less "how much for 10 tons of scrap". I'm sure that you can
get on the bidder list if you can handle that sort of quantity of scrap. Best
guess is that it goes for under a dollar a pound. Of course 20
Hi
Actually a minimalist GPSDO *could* be a person looking at a scope and tweaking
a pot every so often. It all depends on what the desired result is (how
accurate / how automated / how failure resistant). Is simplicity measured by
low cost, low parts count, easy to find parts, or easy to work
On 01/01/12 14:06, Pieter-Tjerk de Boer wrote:
>
> I did manage to make a recording of HBG's shutdown this morning.
> It was at 07:00:13.2 UTC.
> Why precisely then, I don't know...
"Frank, what time is it?"
"'Bout 7AM."
"Weren't we supposed to shut down the transmitter around midnight?"
"."
At 18:20 01/01/2012, you wrote:
Marco,
I have had an HBG-controlled clock for some years.
Hi Murray,
thanks for info - never saw it !
73,
Marco IK1ODO
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Jim Williams did this in one of his designs for measuring low
frequency reference noise. The large value low leakage wet tantalum
capacitor he used was like $400 and it took 24 hours for the
dielectric absorption to settle:
http://www.linear.com/docs/28585
You can get the necessary time constant
Aren't there op-amp circuits that create a large capacitance? The gyrator?
Don
David
> Jim Williams did this in one of his designs for measuring low
> frequency reference noise. The large value low leakage wet tantalum
> capacitor he used was like $400 and it took 24 hours for the
> dielectric ab
http://www.falstad.com/circuit/e-capmult.html
I did not take the time to analyze...
Don
David
> Jim Williams did this in one of his designs for measuring low
> frequency reference noise. The large value low leakage wet tantalum
> capacitor he used was like $400 and it took 24 hours for the
> diel
Hal posted:
> For those who aren't familiar with this trick, it's easy to make a low pass
> filter in software:
> X = X*(1-k) + k*new orX = X - k*X + k*new
OR
Gives exact same results using only one multiply,
New_X = Last_X + k * (New_data - Last_X)
OR
For powers of square root of tw
No HBG clock but a HBG-disciplined OCXO in our lab.. we forgot to change
the receiver to DCF77 but will have to do that on Tuesday, when business
restarts :)
Achim
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Gyrators are usually used to create impractical inductances or
frequency dependant negative resistances but I suppose you could. I
do not think you would gain anything though since you would be trading
one set of non-ideal behaviors for a different set. This is
especially the case since the non-i
Hi
For some designs (like a Rb) the time constant may be in the "days" range….
Even for something simple, you can easily get out to several thousand seconds.
You also need low noise past the cutoff time (for short times the cap may help
you). That's going to get you into resistor noise and / o
Hi
The answer is (as always) "no free lunch". An op amp simulating a capacitor is
always going to be performance limited. Different limitations come in with
different circuits, but they all suffer from noise / drift / leakage. Put
another way - for a long time constant, you are just as good off
Hi
I haven't used that particular unit. I have played with similar units. That's
pretty old stuff, and does not appear to have timing software in it. I suspect
you would do *much* better (both performance and price wise) with something
newer.
Bob
On Dec 31, 2011, at 7:41 PM, wrote:
> UBL
Kasper,
I like your style! Small ROM = no inessential features! I shall be
studying this code, getting capture working with no capture hardware
is a real pain.
On 2 January 2012 00:53, Kasper Pedersen wrote:
> On 01/01/2012 12:23 PM, Tom Harris wrote:
>
>> I too have been mulling over a minimal
Hi
>From what I can see the basic TBolt is still selling as a buy it now item for
>roughly $120 to $130 delivered the US. Sometimes you get the power splitter
>with it (for a couple of bucks) / sometimes not. That's the same price they
>were 18 months ago. Indeed the guys who had them cheap a y
Hi
If you do a quick Google search for "insulation resistance" you get to:
http://www.electrocube.com/support/insulation_resistance.asp
or a bunch of similar information. The capacitor it's self (no external
resistance at all) has a time constant between it's capacitance and internal
leakage.
Thanks for comment. At that price figured he had a bunch or they lacked in
utility. Did buy one to play with the PPS. Thanks, N0UU
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Pieter, please, would you be so kind as to share, for example, the last 60
seconds file?
Thank you
On Sun, Jan 1, 2012 at 10:16 PM, Achim Vollhardt wrote:
> No HBG clock but a HBG-disciplined OCXO in our lab.. we forgot to change
> the receiver to DCF77 but will have to do that on Tuesday, when b
Here is another analog control example based on the quick and dirty example
below.
It is a simple and Very poor GPSDO Rb design as far as noise jitter goes
because of the nonlinear and high Phase detector gain, and high 1e-8 noise
jitter on the PPS,
but still no problem to do with cheap bas
My FE-5680A and Thunderbolt have been well behaved for the
last 16 hours. The Thunderbolt is using 3.00 FW and had its
feedback settings optimized by Lady Heather. AMU mask is 7.0.
No adjustments were made to the Rb during this run.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.
David,
On 12/31/2011 08:30 PM, David wrote:
I agree that they are an amazing value but what kind of operating
lifetime do the Rb tubes have? SRS has this to say:
Historically, the lifetime of rubidium frequency standards has been
dominated by rubidium depletion in the discharge lamp. To avoid
Hi folks,
Ignoring the travesty of a lyric change on John Lennon's classic song, did
anyone check to see if the clock countdown in Times Square was actually
accurate?
In times gone past countdowns have been notoriously off (worst I saw was a
tv personality using his own watch and it was 25 second
This is an interesting observation regarding the Icom radio that can be
run from one master reference. I would assume any radio which has a high
accuracy option has this feature. Looking at the block diagram of the
R-8500, this appears to be an option. For the R-7100, it looks like it
uses one
I think he was mostly ticked off because he came to work 5 minutes early...
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Jim Palfreyman
Sender: time-nuts-boun...@febo.com
Date: Mon, 2 Jan 2012 12:46:30
To: Discussion of precis
To me the ball drop/fireworks was different from the on-screen time on FOX
by a few secnds.
-John
=h
> Hi folks,
>
> Ignoring the travesty of a lyric change on John Lennon's classic song, did
> anyone check to see if the clock countdown in Times Square was actually
> accurate?
>
> In
But TV goes through a lot of buffering these days. I wouldn't expect it
to be too accurate.
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and follow the instructions ther
I think even my old Icom 706 would work that way. It has the high
stability option installed. From what I remember from the service
manual, every mixer has its local oscillator frequency locked to the
master oscillator through either a PLL or DDS which makes passband
shifting via the IF frequenci
A while ago, Rigol dropped the price of their 100 MHz 2 channel scope to be
the same as their 50 MHz version. That was low enough for me. Since then,
they dropped the 50 MHz version to $330.
http://www.rigolna.com/products/digital-oscilloscopes/ds1000e/
I'm happy.
It comes with USB and ser
This is just a tweak of the older two antenna scheme. Basically it gets
rid of the bidirectional nature of the two antenna version.
http://www.homingin.com/newdopant.html
Signals that are heavily modulated such as trunking control channels
don't work well with such schemes. [That part of the e
I bought the D version (the one with the logic probe) about a week
before they slashed the price on the E version. When the upgrade was
small for the logic probe version, it wasn't that much of a decision.
When they slashed the price of the E version, the D version is now sold
at much more of a
Yup, whoever is wearing the wrist watch is the person with the right time ...
bugs the heck out of me, too. I think it's that "pride in ownership" syndrome;
like Chevys are better than Fords, etc, etc.
In my (sort of) normal life, I am never more than a few feet away from a WWVB
or GPS receive
On Sun, 01 Jan 2012 18:35:13 -0800, gary wrote:
>This is just a tweak of the older two antenna scheme. Basically it gets
>rid of the bidirectional nature of the two antenna version.
>> http://www.homingin.com/newdopant.html
Joe has a picture of me on his site if you know where to look. :)
>Sig
You expect *anything* to be accurate on Fox? :-D
I recently read an article about how the new "thing" is to have ever larger
wrist watches. Some new ones are 2.5 inches diameter. Seems like an
opportunity to me, get something on your wrist that has some real serious
accuracy. What would be
ime-nuts@febo.com
>To unsubscribe, go to
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>and follow the instructions there.
>
>__ Information from ESET NOD32 Antivirus, version of virus
>signature database 6759 (20120101) __
>
>The messa
There is a software hack to disable the lowpass filter in the units to turn the
50 MHz one into a 100 MHz one. Apparently no difference in hardware. The
procedure is one the WEB. I bought one of these at Hamvention and have been
pleased. No, I haven't taken the time to do the hack. N0UU
__
An interesting comparison of technique. It skips right past simple
interferometers and goes into correlative interferometry. Since the XY
scheme requires triangulation, it is probably not considered useful, or
they just go right into scheme without ambiguity.
http://www.denisowski.org/Articles/
On Sun, 01 Jan 2012 18:30:24 -0800, Hal Murray
wrote:
>A while ago, Rigol dropped the price of their 100 MHz 2 channel scope to be
>the same as their 50 MHz version. That was low enough for me. Since then,
>they dropped the 50 MHz version to $330.
> http://www.rigolna.com/products/digital-os
I go the other way. Except for eBay, knowing the time w/in 15 minutes or
so suits me just fine. I neither wear a watch, nor carry a cell phone any
more.
-John
> You expect *anything* to be accurate on Fox? :-D
>
> I recently read an article about how the new "thing" is to have
On 01/02/2012 03:16 AM, gary wrote:
But TV goes through a lot of buffering these days. I wouldn't expect it
to be too accurate.
You need to recall that temporal compression of MPEG2/MPEG4 requires
time to buffer up and rebuild. You could even have at least two such
link, one from the OB-bus t
On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
> To me the ball drop/fireworks was different from the on-screen time on FOX
> by a few secnds.
I was watching the media pool HD satellite feed on AMC-1 and
through a broadcast grade IRD (ex PBS Bitlink ) it appeared to be about
2
I was referencing anything to an external, local reference. My comment was
the time difference between the FOX on screen timing and the ball dropping
fireworks. Presumably, the on-screen timing was inserted at their local
control center in NYC, not after satellite hops.
-John
> On
On 01/02/2012 06:09 AM, David I. Emery wrote:
On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
To me the ball drop/fireworks was different from the on-screen time on FOX
by a few secnds.
I was watching the media pool HD satellite feed on AMC-1 and
through a broadcast grade I
You can't even get two TV's in the same house in sync with Dish Network !!
The smaller TV in the kitchen gets the feed about a second before the big
set in the living room !! Must be all that delay in the cheap coax they
use !!
73, Dick, W1KSZ
-Original Message-
>From: "J. Forster"
On Mon, 02 Jan 2012 06:20:36 +0100, Magnus Danielson
wrote:
>On 01/02/2012 06:09 AM, David I. Emery wrote:
>> On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
>>> To me the ball drop/fireworks was different from the on-screen time on FOX
>>> by a few secnds.
>>
>> I was watching t
On Sun, Jan 01, 2012 at 09:14:03PM -0800, J. Forster wrote:
> I was referencing anything to an external, local reference. My comment was
> the time difference between the FOX on screen timing and the ball dropping
> fireworks. Presumably, the on-screen timing was inserted at their local
> control c
Could well be. The ball-drop guys could have been off too. I've no idea
who or why any were off. And it really doesn't matter much. In all
probability, nobody other than a real time nut cares anyway.
-John
> On Sun, Jan 01, 2012 at 09:14:03PM -0800, J. Forster wrote:
>> I was refer
This sounds like a perfect application for applying antenna wax to
coaxial cable.
On Sun, 1 Jan 2012 22:33:00 -0700 (GMT-07:00), "Richard W. Solomon"
wrote:
>You can't even get two TV's in the same house in sync with Dish Network !!
>
>The smaller TV in the kitchen gets the feed about a second
A long shot, but was any time-nut actually in the square?
On Monday, 2 January 2012, David wrote:
> This sounds like a perfect application for applying antenna wax to
> coaxial cable.
>
> On Sun, 1 Jan 2012 22:33:00 -0700 (GMT-07:00), "Richard W. Solomon"
> wrote:
>
>>You can't even get two TV's
davidwh...@gmail.com said:
> Doesn't the Rigol have delayed sweep or is it zoom only?
It has a delayed sweep. You can delay long enough so that the trigger event
is not in the buffer. After you capture a buffer, you can zoom and pan
around in it.
If the sweep is 20 ms/div or faster, the scre
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